I didn’t know what to expect when we landed in Athens. I knew we were going to be meeting with refugees and hearing their stories, but I did not expect what I saw and heard. For one thing, I may have expected a strong narrative of unbearable suffering that ran through every one of these meetings. A narrative of victimhood and helplessness. A narrative which wanted so badly to be heard and listened to so that it could expose its most tragic and historic aspects to create greater awareness and anger for it. I may have expected helpless, uncontrollable tears rolling down my cheeks in response to harrowing tales of torture, imprisonment, of separation – mother from child, husband from wife, brother from sister.

What happened, instead, has left me incredibly perplexed. I heard the harrowing tales of torture, imprisonment, separation, familial betrayal, the difficulties of escaping a brutal crackdown, and of near-death situations. But an almost unexplainable sense of calm ran through these people as they told their stories. A calm motivated by faith and the belief that God is with the Hizmet, or “service,” Movement and has already manifested His mercy by preserving the movement despite these hardships. These atrocities did not destroy the Movement or break its spirit; they look more united than ever.

The narrative that believers suffer at the hands of unjust oppressors, as many prophets did under the tyranny of various pharaohs, is all too common in the Abrahamic texts. But it is an entirely different experience to physically see and talk with someone who has gone through these kinds of traumatic experiences, who is still in the thick of trying to find a home for themselves and their family, to be able to tell their story while showing the utmost reliance on God’s plan. They were also weary of putting their experiences in the context of other refugees, as they understood that others suffered even more.

I believe that their reliance upon God, and their calm approach to faith in the midst of such turmoil, is real. And the reality is clear for all of us to see and hear. Reading about their stories through an article such as this one, or even hearing them speak on the news, pales in comparison to actually being with them during their greatest hour of need. I feel that my mind is not the same as before. I am not claiming that the refugees, the heroes who were persecuted and driven from their homes for crimes they never committed, are completely okay with their situation. What I am pointing out is that, even in the midst of their losses and suffering, they thank God and are not hopeless.

The hospitality with which they welcome guests is astonishing. Considering the fact that they were refugees, they still took the time to host us and make us feel attended to.

Shaken by trauma, the brothers we spoke to find assurance by making dark jokes about their time in prison, or the difficulties they experienced while crossing over to Greece and other countries. Hours were spent strategizing ways to escape Turkey and flee to other countries or to reunite with family members that had already escaped. Their hopes hinged on the kindness of border police and passport patrol. There was rarely enough time to grieve about a father who might still be suffering in prison, or think about those in prison that were without medical attention, or the difficulty of having to share a single toilet among 50 people at a time. There was rarely enough time to grieve about the discrimination that they endured at the hands of their cruel jailors, who tortured and beat many of them until they went blind. I almost felt ashamed that I did not cry in front of them, however I did not feel that it would be respectful to show my pain in front of them when their suffering had outmatched mine so much more. So I sat there, listening quietly, waiting for their words to unfold into long complicated stories of imprisonment, release, escape, survival (or drowning to death), landing in Greece (or being caught), staying in a refugee camp, and then ending up with fellow refugees from Turkey.

The lessons that this experience taught me are too stark to ignore. It showed me that Hizmet is a movement that brings power into question. Every effort is made to mitigate whatever suffering and loss might come from the jihad of speaking out against injustice. But when it strikes, the experiences of those that are suffering, and have suffered, as a result of doing what is good remind us once again that to be comfortable, and to put all of our eggs in one basket, is not the way to live. We should not just strive to be productive people, and the best citizens we can be, even though this is incredibly important. We should also work within the social sphere to make active change to the way people think, and to the ways in which people oppress themselves and other people. And we must be prepared, as opposed to being scared, for a time in which we might need to make drastic changes to our lives. We might even be forced to do so. To work towards active change does not fit comfortably with people who are happy with oppression. As the common maxim goes, “silence is violence.”

Being as comfortable and privileged as we are in the United Kingdom, we need to remember that, even here, people are suffering. We must stand up for them.

I am still shocked that I had the honor of hearing these most intimate stories. I am also honored that Allah has given me the chance to see what real faith looks like. I say to myself that, if I cry, it should not just be because their suffering is too much to bear (not to say that we should not cry at all about this). But it should be because I have a long way to go to meet their level of faith and commitment to Hizmet and their service to humanity.

He has granted you from all that you ask Him. Were you to attempt to count God’s blessings, you could not compute them. But for sure, humankind is much prone to wrongdoing (sins and errors of judgment) and to ingratitude. (Ibrahim 14:34)

Today a large part of modern science focuses on understanding the human body. Researchers working on life sciences hope that one day the secrets of every single detail that make us human will be revealed. Every year billions of dollars are spent by scientific institutions on learning more about us. Actually this fact by itself is enough to suggest how little control we have over things happening in our bodies, and we know even less about the mechanisms of moving, touching, speaking, seeing, or hearing, and so on.

As a scientist, I really cannot guess whether life scientists will ever be able to learn enough to solve the puzzles of the human body, but I feel a lack of satisfaction when the knowledge we have gained from scientific discoveries is compared with what is unknown. In my opinion this is why one of the most intelligent physicists in history, the Nobel laureate Richard Feynman, once said, “I was born not knowing, and have only had a little time to change that here and there” [1]. My understanding is that such a conclusion must be inevitable if the primitive knowledge given to us by modern sciences is not interpreted in the light of a far superior logic that is meant to explain the whole creation. In that sense, I believe that we have to consider every single detail in creation as a vital part of the whole in order not to feel lost before the grand picture of this masterpiece.

Last year, in a seminar at Osaka University Graduate School for Frontier BioSciences, I was thrilled to hear Professor Keichi Namba say, “Japan’s fastest supercomputer dissipates more than billion times the power dissipated by a fly’s brain, yet it is not able to simulate the brain of such a tiny animal.” This worked as a wakening call or a reminder for me to think again about the magnificent arts of the Creator. In particular, I wanted to revise my research on a hearing-related protein from a new perspective, rather than using the mechanical attitude that is followed most of the time.

This article is an attempt to explain an amazing mechanism in our ears that enables us to hear the faintest whispers. A mechanism that is switched off at loud cries to protect us from disturbing noises, yet amplified to make the softest sounds audible. Before starting to explain the basic anatomy of the human ear, I should mention that today the ear’s active amplification mechanism is still being investigated in research centers by biologists and physicists together.

How do we hear? What is happening in the inner ear?

Findings from the last century have shown that our ears are not just simple receivers as we had imagined. In 1979, David Kemp of University College, London discovered that mammalian ears can also emit sound vibrations. By placing a very sensitive microphone close to the eardrum he could detect whistles, implying that there is a source of vibration within the ear [2]. However, before trying to explain the cause of vibrations in the ears, we have to go over the mechanism of hearing briefly: The delicate design of the outer ear, the tympanic membrane (eardrum), and the tiny bones (malleus, incus and stapes) enables to collect sound waves traveling in the medium and transfer them to the inner ear (Figure 1a). In the inner ear the sound waves are sorted according to their frequency and amplitudes and then converted into electrical signals which can be transported to the brain via nerves. At the onset of this process the sound waves are transformed into standing waves on the basilar membrane which is laid along the organ resembling a snail, the cochlea (Figure 1b). The frequency of the incoming sound wave determines the positions of the distortions along the cochlea: High pitches create vibrations at the basal end of the cochlea (i.e. adjacent to the middle ear) whereas low frequencies vibrate closer to the apical end (Figure 1c) where the cochlea gets narrower. This geometry helps our ears to act as a frequency analyzer.

The efferent and afferent nerves that connect the ear to the central nervous system are attached to the organ of Corti, which is situated right next to the basilar membrane, extending over the cochlea. In other words, Corti is the sense organ of hearing, converting the motion of the basilar membrane into electrical signals that are conducted to the brain via neuronal cells [3]. The organ of Corti is also lined with multiple rows of sensory hair cells.

The hair cells of the organ of Corti

Corti is decorated with two different sets of sensory cells: single row of inner hair cells (IHCs) accompanied with 3–4 rows of outer hair cells (OHCs), both spanning the whole cochlear tube (Figure 2a). They are called “hair cells” because both IHCs and OHCs have typical bundles of stereocilia that contain mechanosensitive ion channels (Figure 2b).

The major function of IHCs is to detect the sound waves and then convert them into equivalent electrical signals that are to be interpreted by the brain. When the basilar membrane is perturbed by the incoming sound waves, the IHCs found in that region sense this activity by the movement of their hair bundles (bundles of stereocilia). The hair bundles of IHCs deflect and re-align as the basilar membrane moves up and down (Figure 3). We should note that this is an amazingly sensitive process such that deflections of the stereocilia on the order of a few nanometers (one millionth of a millimeter) can be detected and converted into nerve signals by the IHCs [4].

However, this by itself is not sufficient for hearing; no matter how effective IHCs work, the fluid that fills the cochlear tube is a threat to the sound waves traveling in the inner ear. In 1948, a young astrophysicist named Thomas Gold was the first person who has pointed out that the fluidic nature of the cochlea would dampen the sound vibrations and make them too weak to be detected by IHCs. He has concluded that an inherent vibration amplification mechanism is necessary in order to overcome such a problem [5]. Unfortunately, Gold’s statements were overlooked by the physiologists of his time who had performed their hearing related experiments on dead cochleas.

Gold’s predictions were justified around ten years later by William Rhode, a physiologist from University of Wisconsin, who has shown that the vibrations of the basilar membrane in live tissue samples are stronger than anticipated [6]. In the present day the existence of an amplification mechanism within a live cochlea is a well accepted fact. The only disagreement among scientists is about how the mechanism of the amplification works. Several scientific laboratories have reported different experiments performed on the organ of Corti and they have proposed different models. At the center of one of these models is prestin, a membrane protein which is not found in any cell but OHCs in the human body.

Electro-motile outer hair cells and prestin

In 1985, the distinctive properties of OHCs were first discovered by William Brownell, a University of Geneva neuroscientist, who has shown that these cells can convert electrical signals into motion: A phenomenon called electromotility. Electromotile OHCs can elongate or shrink in response to electrical charge density changes in their membranes. About a decade ago Peter Dallos and co-workers from Northwestern University in Chicago discovered a membrane protein, unique to OHCs, that can respond to electrical signals [3]. The Dallos group coined the name “prestin” for this protein in an analogy with the musical term “presto” (quickly) due to its rapid response to electrical signals. Various kinds of mammalian cells genetically engineered to produce prestin at their membranes displayed the electromotile responses that are very similar to OHCs.

According to Peter Dallos prestin protein works as a tiny machine which is a crucial element for cochlear amplification [7]. His theory is verified by recent studies which show that cochlear sensitivity in mice decreases hundredfold when prestin activity is disrupted by genetic means [8]. As the sound waves reach the inner ear, prestin-driven electromotility enables the OHCs to move like pistons. The piston movement in phase with the basilar membrane motion amplifies the vibrations and makes them stronger for IHC detection (Figure 4a,b). The prestin-driven vibrations were what Thomas Gold proposed and David Kemp had detected so many years ago. However, scientists are still searching and learning new things about this nanometer scale machine. One of the discoveries showed that prestin can adjust itself according to the amplitude of the incoming sound waves: Basically, the amplification is stronger when the sound waves are hard to hear but gets weaker as the volume increases.

Up to this point, we have briefly explained how the amplification mechanism of hearing in mammals works. Unfortunately, even though it took decades of research for scientists to discover and define the active nature of the mammalian ear, this explanation highlights only a minuscule part of the whole picture. That is why we are still incapable of curing most hearing problems. For example, hearing loss due to slightly disturbed hair cells with damaged stereocilia turns out to be chronic (Figure 5). The medical treatments we have to hand are too primitive to mend such delicate structures. Moreover, hearing aids made by today’s technology are not nearly as effective and functional as needed.

On the other hand, the delicacy of the hair cells and the limited control scientists have over them are not the only lessons we have learned from research on the inner ear. We cannot overlook the other messages attached to the research on the grounds that the time given to us is just too short to comprehend. It is an undeniable fact that the sense of hearing is designed in the best way to serve human beings. The different characteristics of hearing amplification at different sound levels make life much easier for us: Prestin-driven hearing is most effective when the sound waves are weak and harder to hear. This way the incoming sound waves are amplified enabling us to hear the faintest whispers. However, as the sound strength increases, the prestin-driven amplification gradually gets weaker and finally diminishes after a point to make sure that loud noises are less disturbing and hazardous for us. In my opinion, this amazing quality of a tiny protein found in our ears is one of the pieces of evidence that remind us of the necessity of pondering the favors of our Creator. Qur’anic verses such as Ibrahim 34 at the beginning of this article give us clues about how to interpret scientific findings that reveal the amazing qualities of our bodily organs. May the Creator of our ears allow us to reflect more on His favors and live accordingly.

Hamdi Sener is a biophysicist living in Boston. He can be contacted at hamdisener@gmail.com.

References

1. Gleick, J., Genius: The Life and Science of Richard Feynman. Reprint ed. 1993: Vintage. 560.
2. Kemp, D.T., The evoked cochlear mechanical response and the auditory microstructure- evidence for a new element in cochlear mechanics. Scand Audiol Suppl., 1979. 9: p. 35–47.
3. Zheng, J., et al., Prestin is the motor protein of cochlear outer hair cells. Nature, 2000. 405(6783): p. 149–55.
4. Robles, L. and M.A. Ruggero, Mechanics of the mammalian cochlea. Physiol Rev., 2001. 81(3): p. 1305–52.
5. Gold, T., Hearing II. The physical basis of the action of the cochlea. Proc. Roy. Soc. B., 1948. 135: p. 492–498.
6. Rhode, W.S., Observations of the vibration of the basilar membrane in squirrel monkeys using the Mossbauer technique. J. Acoust. Soc. Am. , 1971. 49: p. 1218–1231.
7. Cho, A., What’s Shakin’ in the ear? Science, 2000. 288: p. 1954-1955.
8. Liberman, M.C., et al., Prestin is required for electromotility of the outer hair cell and for the cochlear amplifier. Nature, 2003. 419: p. 300-304.
9. Fettiplace, R. and C.M. Hackney, The sensory and motor roles of auditory hair cells. Nat Rev Neurosci., 2006. 7(1): p. 19-29.
10. Dallos, P. and B. Fakler, Prestin, a new type of motor protein. Nat Rev Mol Cell Biol, 2002. 3(2): p. 104-11.

Life without me is only silence

Every artist wishes to present his work to admiring eyes. In the whole universe, from atoms to star systems, God shows all the details of His art to you, a conscious being; and among His works, He has installed the most splendid ones in your body. He has given you reason and knowledge so that you can easily see and understand them. With knowledge, you can appreciate the meaning and different qualities of existence. However, you need another tool, your five senses, through which you will look at and learn about the material world around you and then turn this knowledge into an appreciation of the meanings behind God’s creation.

If you were not able to perceive light and color (by your eyes), your knowledge of material existence would be insufficient. Similarly, if God had not placed me in your skull, you would not be able to hear and know the songs of birds, the rustling of trees, the babbling of water, or the whistling of wind, which are each a note in the divine musical harmony throughout the universe. Indeed, everything speaks in its own tongue in order to introduce God to people. You use your eyes to perceive the things that speak with the wavelengths of light. You use me to perceive other wavelengths called “sound,” which is caused by the vibration of molecules.

The wavelength of the sounds that I can perceive ranges between 20 and 20,000 Hertz. I am unable to sense frequencies of sound that are above or below those limits. Indeed, it would be better to call this an advantage given by God rather than an “inability.” If the Creator of everything in the universe had not created me with this limited capacity, you would be facing unbearable pain in your head. If He had made me work with a wider range of hearing, you would be disturbed by the footsteps of a little ant, the moaning of an insect laying eggs, the buzzing of beehives, and the sound of the fluttering birds. Therefore, the fact that I have sufficient sensitivity for you to meet your needs is an advantage and an indication of God’s mercy. After all, my Creator gives everybody exactly what they need in a most suitable way and in the best measurements; He never does anything absurd. Do not ever want to have an ear like that of a bat. I am the best one for you.

Do not ever think that my outer, visible part is too simple. My outer ear, which sometimes turns red when you are nervous, is placed in the best position according to the shape of your head so that it can receive sounds in a most efficient way. Because it is made up of elastic cartilage, my outer ear (A) is very flexible, and it won’t break when you lie on it. The curves on me (known as the helix) and the hairs inside my channel are not made without a reason, either. My cartilages have the perfect shape to channel the sound down towards my middle ear according to the intensity of the sound and the direction it comes from. Because this special shape is formed according to the genetic code of a person, it is different in every person. The hairs in the canal serve to protect me from foreign objects like insects or dust. The canal that connects my outer part to my middle part is pretty wide, but if too much fatty wax accumulates here, I might experience temporary hearing loss.

My outer part is followed by my middle ear, which begins with the ear drum (tympanic membrane) (C). Attached to this thin ear drum are three bones: the malleus (D), the incus (E), and the stapes (F), which are all placed in order. These little bones are jointed to each other at an angle of 105 degrees. With an action like a piston, they amplify even the smallest sound vibration coming from the ear drum and transmit it to the middle ear. My middle ear space is connected to your pharynx by a very thin canal called the Eustachian tube (G). In order to protect my ear drum from rupture, I recommend that you open your mouth during an explosion or an intense sound. In that way, the sound waves that enter through your mouth will balance with the sound waves in my canals so that my ear drum is protected.

My inner part, followed by my middle part, is the most vital and sensitive area. Therefore, it is surrounded and protected by the bones of your skull. This inner part, which is an amazing piece of art and technology, comprises two wonderful receptor components. Those two little parts are placed in the same narrow area inside the temporal bone, but they perform different tasks. One of them is the cochlea (H), which is involved with hearing. The other part is the balance (vestibular) canals, which consist of the semicircular canals (I), the saccule (J), and the utricle (K). This balance organ enables you to stand straight and walk, run, or move without bumping or falling.

Like carved marble or forged metal, those parts are crafted out of bones that form a beautiful and intricate whole. My cochlea is divided widthwise by a bony tube. The upper compartment above the tube is connected to an oval window, which is an outlet to the middle ear. The lower compartment below the tube is connected to a round window. My inner part is a labyrinth of fluid-filled tubes. The fluid in the bony labyrinth, between the bone and the membranes, is called perilymph, and the other fluid within the membranous structure is called endolymph.

Situated on the basilar membrane (L) of my cochlea is a very small and special organ that you call the organ of Corti. The organ of Corti contains the hearing cells (or hair cells), the receptors (M) that are sensitive to sound waves, and other supporting cells. Because the length of the cells in the organ of Corti varies, different parts of my cochlea are sensitive to sounds of different wavelengths.

The sound waves travel via the malleus, the incus, and the stapes and through my oval window, agitating the perilymph of my cochlea. After that, the sound waves cause Reissner’s membrane (N) in my cochlea to vibrate, which then results in a wave movement in the endolymph. The wave movement continues along this membrane until it reaches my organ of Corti. The special receptor cells (or hair cells) of the organ of Corti are the ultimate vibration receptors. Their surfaces consist of very small strands (cilia). Those little strands bend and twist when the sound waves are received. Right at this point, a very important event occurs: it is the movement of these strands which converts the mechanical energy (that is produced by the vibrations of the sound waves) into electrical impulses. Those electrical impulses are then sent to your brain via the auditory nerve (nervus cochlearis) of the brain, where they are perceived as “sound.” The same sound waves continue their way to the perilymph and pass into the round window, the section between the middle ear and the inner ear. The round window pushes out to dissipate the sound vibrations in the perilymph and thus lessens their pressure.

The speed of the hearing depends on the speed of the sound that travels through my membrane and little bones. However, once the sound waves begin to pass to your brain as an electrical impulse along the auditory nerve, the hearing process increases its speed. Then your brain immediately interprets and reacts to the sound waves. You are not aware of all these rapid activities which are done perfectly in fractions of a second. You only say that you can hear something ordinarily. Have you ever thought before about how hearing takes place? Do you think you would have a clue about the sounds and music in the universe if God had not created me as your hearing organ?

Think about it, Peter! God knows exactly what you need for your life and equips your body accordingly. If there were no God, would such a complicated organ as your ear form by itself in your skull? Can it be a simple “coincidence” where some biological mechanisms take place successfully and in order without any plan or project and they produce such a splendid organ as me with all my sections? Like every reasonable and thoughtful person, you now understand that I cannot be the result of simple coincidence but only a creation of our God Almighty, don’t you?

Maintaining your balance

So far, what I have told you about is my duty to hear. Now I must also tell you about my duty of balance, so that you can better understand how miraculous I am.

Have you ever seen an acrobat walking on a rope or a mountain climber in action? Or shall I give a better example that might be more familiar to you? Remember what you do on your bicycle to keep from falling off. At the slightest mistake, the acrobat might topple from the rope, the climber might slip off the cliff face, and you might fall off your bicycle. While you are making unconscious (reflex) movements to keep your balance, have you ever thought about what busy operations are going on in my system? I have been equipped with very sensitive receptors which help you stay stable during your continual, different movements. Those receptors immediately recognize the changes occurring as a result of your slightest motion; they warn your body to adjust to your new position by sending out information to the spinal cord and to the brain about the new situation.

You may wonder how these two processes, hearing and balance, can take place in such a small area of the body, the inner ear. It is our Creator, God, who puts microscopic cells in a narrow place and runs the most sensitive and important operations via those little cells.

How do you feel the sensation of balance and how do you react with the right reflex action? To find an answer to that, you need to re-examine my anatomical structures mentioned before. At the base of my semicircular canals is a bulb-like enlargement which opens to the saccule and the utricle. My three semicircular canals are situated at 90-degree angles to each other in three-dimensional space.

My semicircular canals contain few sensory hair cells but there are plenty of them in the bulb-like enlargement. The strands of these cells, which are placed delicately, have enough elasticity to twist and bend during a movement. The receptors for balance in the saccule and the utricle are covered by a thin membrane which contains a gelatinous layer and tiny calcite crystals (cupula terminalis). Depending on its density, the endolymph fluid in my semicircular canals moves against the direction that your head and body move in. Similar to the uncontrolled movement of passengers in an accelerating or moving vehicle, depending on the speed and the direction, the movement and the speed of the endolymph differs from the general movement of your body. For example, when a car turns right, the passengers move to the left with the turning acceleration, and when a fast-moving car brakes suddenly, the passengers are thrown forward. Similarly, depending on its acceleration and momentum, every change in your movement causes the fluid in my semicircular canals to move. Triggered by the movement of the endolymph fluid, the gelatinous mass with the calcite pieces is displaced, causing the strands of the receptors to twist. Every movement of your head warns the cells of different parts, and via the vestibular nerve (nervus vestibularis) the nervous system is notified of changes occurring in your balance.

Thankfulness and contemplation

You have now seen what amazing works my two compartments, the balance and the hearing organs produce. All through your life, the former serves you by maintaining your balance without missing any of your movements, while the latter enables you to learn about the thousands of types of sounds in the world. Once you consider all of your movements in your life, you will see that my two organs perform their duties perfectly without ever getting tired, giving up, or complaining. We do not ask for any fee from you in return for those benefits, either. In fact, when God Almighty created you, placed us in your skull and set up our connection with the related center in your brain, He did not ask for any fee from you. All He wants you to do is to think about those blessings and be thankful to Him.

If you visited a hospital, you might see a lot of scenes which would lead you to think about God’s blessings on you and thank Him. Serious ear illnesses include middle ear infection (otitis media), which is frequently seen in children; otosclerosis, which is the limited ability of the stapes to transmit sound waves because its base becomes fixed to the oval window; and several hearing disorders which might be present at birth or occur later in life, depending on the level of damage to the auditory nerve. Witnessing the effects of those illnesses, you would understand how important it is to be able to hear and stand straight and balanced, and so see how blessed you are. At every step you take, when you are lying down or standing up, or every time you hear the twittering of birds, a nice melody, or the sweet voice of your parents, you will now appreciate the greatness and the mercy of our Lord God Almighty, who has engraved the meanings of all those sounds in your mind.

Peter! Until now, you have used me to listen to others, but today it was my turn to be listened to while I told you about myself. However, I must admit that I have only been able to explain to you the details of about one-hundredth of the beauties displayed in me and my delicate anatomical structure. If I attempted to present you with all the details about me discovered by developing technology and science and the meanings attached to them, there would not be enough pages in the magazine that you are holding now. Indeed, you do not need that much information either. My main aim here is to draw your attention to me, and thus let you know our God and bring you closer to Him. I hope I am successful in that. From now on, you will hear my ringing occasionally and remember me so that you will be saved from your heedlessness once again.

Irfan Yilmaz is a professor of biology at Dokuz Eylul University, Izmir, Turkey.

The human ear and hearing

The human ear can be divided into several functional sections: the outer ear, the middle ear, the inner ear, and the auditory nerve. Sound goes through a series of changes as it travels through these sections until reaching the brain. The outer ear picks up sound pressure waves, amplifies them and then converts them into mechanical vibrations on the ear drum, which is connected to a series of small bones in the middle ear. These small bones further amplify or diminish the mechanical vibrations in the ear drum and transfer them to the cochlea, a snail-shaped cavity filled with fluid which is located in the inner ear. Change in fluid pressure caused by vibrations within the cochlea lead to changes in the flexible membrane, called the basilar membrane. These changes contain information about the frequency and strength of the sound that has entered the ear. Attached to the basilar membrane are mechanical receptor cells, called hair cells, which are bent according to the deflections of the basilar membrane.The hair cells have hair-like structures. The bending of these hairs assists the release of an electrochemical substance that causes neurons to send electrical signals to the brainstem through the auditory nerve. These signals are in the form of a message (or a code) that the brain understands.

Cochlear Implant (CI) devices

If there is a broken link in any part of the auditory pathway, the brain does not receive any coded signals, and hearing impairment occurs. If a large number of hair cells or auditory neurons in the cochlea have been damaged, then the person is diagnosed as profoundly deaf. The hair cells can be damaged by certain diseases (e.g., meningitis, Meniere’s disease), by congenital disorders, by certain drug treatments, or by other causes. One negative outcome of damaged hair cells is that they can subsequently lead to the degeneration of adjacent auditory neurons. Research has indicated that the most common cause of deafness is the loss of hair cells (>95%) rather than the loss of auditory neurons. This has encouraged scientists to try implanting a device inside the iner ear or cochlea, bypassing the normal hearing mechanism of the ear, to stimulate the remaining auditory neurons directly through electrical signals. These are called Cochlear Implant (CI) devices, which can restore partial hearing in profoundly deaf people . A standard CI system, shown in Figure 1, composes of and performs the following functions: a microphone picks up sound pressure waves and converts these into electrical signals. The signals are sent to the speech processor that is worn by the patient. The speech processor analyzes and encodes these sound signals, sending them back to the external pick-up coil . After passing through a wireless radio link that lies between the external and implanted coils and an implanted electronic devise, coded signals are sent to the implanted array of electrodes in the cochlea to electrically stimulate the remaining auditory neurons , and the brain receives what it interprets to be sound.

Electrical stimulation of the ear, or CI research, can be traced back to the 1800s. The Italian scientist Alessandro Volta used a battery as a research instrument to demonstrate that electric stimulation could result in a number of human sensations . After connecting a 50- volt battery to his ears, he noted that “…at the moment when the circuit was completed, I received a shock in the head, and some moments after I began to hear a sound, or rather noise in the ears, which I cannot well define: it was a kind of crackling with shocks, as if some paste or tenacious matter had been boiling…”. That electric stimulation of the auditory nerve provides hearing sensation in deaf people was reported more than 100 years after Volta . Electric stimulation in two deaf patients resulting in hearing was reported in 1957. These successes resulted in intensive research into helping deaf people hear in the 1960s and 1970s. One of the early successful single-channel CI devices was developed in the early 1970’s (3MCorp/House) and became the first commercially available CI device approved in the United States in 1984. The University of Utah developed a six electrode implant called the Ineraid or the Symbion device in the early 1990s. It was followed by other devices in Europe, the United States, and Australia.

The present status of Cochlear Implants

Today, around 10% of the population in developed countries suffers from hearing impairment. At present, the number of CI users has reached more than 100,000 worldwide, and is still growing rapidly. Functionally, CI has evolved from the single-electrode device that was used as an aid for lip-reading and

sound awareness to a modern, multielectrode device that can allow an average user to talk on the telephone. Even though significant technological progress has been achieved in the last 50 years, there are still many mysteries about the human hearing process and the parts of the ear. Here, we will compare some aspects of the healthy human ear and CI devices, looking to the future. The human ear operates over a range of sound pressures (its dynamic range) which is greater than one million to one (120dB), with as many as 200 discrete steps in the range. In contrast, today’s CI devices typically provide a dynamic range of three to one (10dB) to ten to one (20dB) with 20 discrete steps. This major difference is mainly due to the fact that the human ear is very adaptive in noisy environments, and is able to suppress noisy background, while picking up and processing appropriate sound signals for better perception. CIs do not differentiate between sounds, but amplify all sounds, which results in poor sound perception. Today, a typical multi-channel CI system uses 16 to 24 electrodes implanted in the cochlea with 8 to 22 signal processing channels. A potential shortcoming of having so many electrodes and channels in current CI technology is the electrical interference of electrodes during simultaneous electrode stimulation. These electrical interactions can disrupt the stimulus waveform prior to neural activity and degrade sound perception. The normal ear contains roughly 3,500 inner hair cells in the cochlea that are tuned to different frequencies from 20 to 20,000 Hz. They are connected to about 35,000 auditory nerves. Hair cells work as signal processing channels, yet each of the inner hair cells has also been wired in a sophisticated and little-understood fashion to 10-20 auditory nerve fibers that carry information to the central nervous system. Since they work in the chemical domain, they do not have the gross interference issues of CI electrodes. While good speech understanding has been achieved by users of modern multi-electrode CIs operating in quiet environments with 70–80% sentence recognition, allowing users to talk on the telephone, the CI devices do not discriminate between noise and the meaningful signals, only achieving speech understanding at between 70% and 80%, which falls to 10% or lower in noisy environments. It is a great challenge for CI users to appreciate music. Some CI listeners reported that they can enjoy music and are able to recognize melodies, but most described musicas sounding unpleasant and noisy, and performance could not be increased with current CI technology. CI users have difficulty in identifying differences in frequencies. Typically, they cannot discriminate any frequency difference for frequencies higher than 500 Hz, while the normal ear can hear up to 20,000 Hz with frequency discrimination between 2 to 3Hz at best. This gross difference is related to the issues surrounding signal processing strategies and electrodes of current CI systems. Predicting post-surgical performance based on presurgical conditions and tests of a CI candidate is still a problem for the physician. The cost of surgery is still high; in the United States, for example, a typical cost is between $40,000 and $75,000. Beyond these issues, the moral, cultural and ethical issues related to CIs are very complex. They are still debated, and are an important part of CI development in the world today. The hair cells in the human ear naturally deteriorate and die as we grow older. This process is typically sped up with exposure to loud noise. In common with all mammals, new hair cell generation in human ears stops right after the birth. However, in fish and amphibians, very similar cells are present and reproduce throughout life. Recently, it was found that hair cells of birds are repaired after being damaged by exposure to noise or ototoxic agents. It was also discovered that hair cells in the mammalian vestibular (balance) organ, very similar to those in the hearing system, can regenerate. These findings, along with other advancements in medical fields, lead to long-term research into different aids for hearing- impaired people. Despite the fact that hearing loss is usually permanent, scientists are optimistic that it may eventually be possible to reverse the damage in the ear by repairing or regenerating the sensory hair cells through gene therapy, stem cell transplantation, or ultimately by replacing the human cochlea with an artificial one. Today, Auditory Brainstem Implants are also being tried on humans for direct brainstem stimulation, bypassing the ears and the auditory nerves. Human beings and most animals on earth are born and equipped with a pair of ears for a good reason: having two ears enhances hearing and sound localization. Scientists are examining whether this is also true for deaf children who receive not one, but two CIs.

Conclusion

The sense of hearing is a gift for human beings which they hold dear and are grateful for, as much as for any of the other senses with which they have been equipped. It is important to strive to find cures for all kind of diseases, yet, more important than the cure is prevention of harm to our body and its amazing senses. Here, we have tried to open a small window onto human hearing, to examine how related impairments are being dealt with through cochlear implant (CI) devices, as well as looking at the issues related to these devices and the future directions of research for restoring hearing to deaf people. It is obvious that we have learned much about human hearing and ear in the past century; yet, this may well be just the tip of the iceberg.

References

1. S.U. Ay, F.-G. Zeng, B.J. Sheu, “ Hearing with bionic ear,” IEEE Circuits & Devices Magazine, Vol. 13, No. 3, pp.18-23, May 1997.

2. F.-G. Zeng, “Trends in cochlear implants,” Trends in Amplification, Vol. 8(1), pp.1-34, 2004.

3. A. Volta, “On the electricity excited by mere contact of conducting substances of different kinds,” Royal Soc. Philos.Trans., vol. 90, pp.403 431, 1800.

4. A.M. Andreev, G.V. Gersuni, A.A.Volokhov, “On the electrical excitability of the human ear: On the effect of alternating currents on the affected auditory apparatus,” Journal of Physiology USSR, Vol. 18, pp.250-265, 1935.

The discipline in which medicine and engineering truly meet and face new challenges is the field of “biomedical engineering,” an emerging discipline that is only a few decades old. In each sub-specialty of biomedical engineering, researchers study the human body, develop new materials and structures using engineering sciences, either as a treatment method for disease (e.g. artificial bone implants, artificial blood, vascular stents, cardiac valves, etc.) or to diagnose them (e.g. imaging methods and other diagnostic instruments in hospitals). Biomedical engineers face the incredible challenge of developing materials and devices that are compatible with biological systems and capable of working inside the human body to substitute bodily functions. Needless to say, the extreme complexity of the human body makes it impossible to mimic the original system or function of the organs in any way. However, even a poor replacement part or a functional improvement provides great benefit to the patients.

One of the most complex systems of the human body is the nervous system, which consists of the central area (the brain and the spinal cord) and the peripheral parts. The branch of biomedical engineering that deals with the nervous system is “neural engineering.” In this article, we will touch upon a specific subject in the broader area of neural engineering, that is, “neural prosthetics.”1 As the name implies, neural prosthetics is an area where engineering knowledge is utilized to treat neural disorders.

The building blocks of the nervous system are called “neurons.” Neurons generate electric pulses to communicate with each other. The fact that these electric pulses can be elicited by artificial means, i.e. by applying small electric currents to the neurons externally, forms the very foundation of the field of neural prosthetics. Neural engineers can input information into the nervous system by taking advantage of this phenomenon, called “neural stimulation.” Likewise, the information content of neuronal activity can be deciphered by recording the electrical pulses from the neurons and interpreting them according to neuronal function. This two way traffic, monitoring and controlling the neural activity, allows researchers in this field to develop methods of treatment for some sensory, motor, and psychological disorders.

Some of the most successful neural prosthetic applications have been in deep brain stimulation in Parkinson’s disease,

cochlear prosthesis in hearing impairment, bladder emptying and respiration in spinal cord injury, and vagus nerve (10th cranial nerve) stimulation in epilepsy and psychological depression. These are neural prostheses that are readily available as a treatment method for the given ailments. There is a whole host of others that are in the research and development phase. We will review a couple of examples.

In certain diseases of the inner ear hearing is lost as a result of damage to the hair cells inside the cochlea. In normal cochlea the sound information reaches these hair cells after traveling through the ear drum (tympanic membrane) and the structures of the middle ear, causing them to vibrate. This vibration of the hair cells is mechanically transported to the spiral ganglion cells that form the hearing (auditory) nerve. The hearing nerve carries the sound information to the brain in the form of electric pulses. The ganglion cells are healthy and functional even if the entire population of hair cells has been lost as a result of disease. Neural engineers take advantage of the fact that the spiral ganglion cells (which normally accept input from the hair cells) can be electrically stimulated, thus mimicking the function of the hair cells and producing the sensation of sound.2 During a simple surgical operation, the surgeon inserts an electrode into the ear canal which spirals into the lumen of the cochlea so that the sites where the electric current emits from the electrode are adjacent to the spiral ganglion cells (Figure 1). To summarize the principle of the operation; the audio signals are captured by a microphone, processed, converted into electric pulses (A in Figure 1), and transmitted to the implant over a transmitting antenna (B in Figure 1), or headpiece, held in place by magnets. The implant (C in Figure 1) applies the signals to the ganglion cells in the cochlea through tiny electrodes (D in Figure 1). The hearing nerve (auditory nerve) carries the sound information to the brain, where it is “heard.”

Even though the human spiral ganglion has tens of thousands of nerve cells that provide a rich sense of hearing, the cochlear implant, using only six stimulation contacts, can produce auditory perception with sufficient fidelity to enable a deaf individual to use an ordinary telephone.3 Individuals with cochlear implants can also improve their hearing with practice. Thousands of patients have been implanted with cochlear prostheses to date, including children.

The second neural prosthesis application we will review is the retinal prosthesis, which, unlike the cochlear implants, is still in the research phase. Retinitis pigmentosa and age-related macular degeneration both lead to photoreceptor degeneration in the eye and result in a significant visual deficit or blindness.4 A growing body of research supports the feasibility of replacing the function of the photoreceptors with an electronic device. 5–7 A retinal prosthesis is analogous to the cochlear implant in many ways. In a healthy retina, the photoreceptors initiate a neural signal in response to light. In a retinal prosthesis, electrical pulses are utilized to initiate a neural response in the remaining cells of the retina, the bipolar and ganglion cells. It is hypothesized that the perception of shapes and images will be possible through pattern stimulation of the retina. Initial results are encouraging, but the quality of vision that can be attained with this approach is still a question to be answered. A conceptual retinal prosthesis system is shown in Figure 2. The system consists of an external unit coupled to an implanted stimulator with a wireless link. A video camera in the external unit captures an image and converts it to digital data. The implanted unit receives the signal, recovers power and data from the signal, and generates the stimulating current. The stimulus pattern is applied to the retina via the electrode array, which contains distinct electrodes that interface at many locations on the retinal surface. Recent implants in human subjects suggest the feasibility of this approach where individuals attain perception of bright dots in the visual field called ‘phosphenes.’ Furthermore, blind subjects are able to perceive edges when a few of these bright dots are lined up in their visual field.

Figure 3: A conceptual diagram of a Brain-Computer Interface for high level spinal cord injury or patients with ‘locked-in syndrome’ (adapted from Wolpaw et al., see note 9). The recorded neural activity from the motor cortex is processed and converted into command signals to control, for instance, a wheelchair, or to generate electrical signals to activate hand muscles for grasping an object.

Both cochlear and retinal implants are sensory prostheses, i.e. aids for sensory impairments. Another family of neural prostheses deals with motor impairments. Severe motor disability results from high level spinal cord injuries (quadriplegia) where most of the body is paralyzed, sparing only some face, neck, and shoulder muscles. Quadriplegic individuals are in extreme need of a means to control their environment; they need to be in control of their wheelchairs, bed, the room temperature, lights, TV, etc. Because of the level of paralysis it is impossible for them to generate any control signal, except perhaps by sipping or puffing on the end of a tube, which produces a very poor control signal. In the case of a ‘locked-in syndrome’ the condition of the patient is even more serious, with only some functions remaining in the facial muscles. The term ‘brain-computer interface’ has been coined to refer to attempts whereby the motor output of the brain is recorded and interpreted to generate the control signals needed by these patients (Figure 3,9). The ultimate objective of this research will be accomplished when the patients are able to control anything they need to control in their environment, including a computer. The brain-computer interfaces vary in the invasiveness of the approach. The least invasive methods utilize the electroencephalogram (EEG) signals recorded from the scalp. Unfortunately, the signal quality is poor and only ‘on/off’ type of command signals can be generated using this method. In the most invasive, yet most successful applications, an array of electrodes is implanted directly into the motor cortex of the brain at a depth of a couple of millimeters. The recorded signals contain volitional information as the patient makes intentions to move their arms or legs. These signals can be controlled by the patient, and they can in turn be used to control their environment. The current level of success in this type of BCI allows the user to have three dimensional control of a robot arm. This is of invaluable benefit to a quadriplegic individual.

Concluding Remarks: Reflections on Divine Wisdom

Even the subtlest parts of the nervous system are extremely complex. Just to name a few examples, from the highest centers in the brain down to the skeletal muscles in a descending order; the neural circuits of the short-term memory in the hippocampus, fine motor control circuits of the cerebellum, central pattern generators in the spinal cord, and even the control of skeletal muscles in graceful movements of the limbs are impossible to reproduce by artificial means. The Seal of Divine Design is clearly visible in these neural systems, as they are far more complex, far more compact, and far more functionally efficient than any system engineered by mankind. If anything, the growing experience in neurosciences teaches us that the vertebrate nervous system is full of wonders of engineering design. Therefore, it is a great blessing to be a student of both neurosciences and engineering disciplines. This bestows neural engineers with a unique perspective to understand the beauty embroidered into the human nervous system and contemplate on the Divine Wisdom. In spiritual terms, we may think of the human nervous system as a window opening to the works of Divine Wisdom, with manifestations of His Beautiful Names at the brightest level. It is an overwhelming joy to be able to open this window a crack, once in a while, and take a little peek.

References

1. Wise, K.D. ‘Silicon microsystems for neuroscience and neural prostheses,’ IEEE Engineering in Medicine and Biology Society Magazine, vol. 25, no. 5, pp. 22- 29, Sept.-Oct., 2005.
2. G.E. Loeb, ‘Cochlear prosthetics,’ Annu. Rev. Neurosci., vol. 13, pp. 357–371, 1990.
3. J. Helms, V. Weichbold, U. Baumann, H. von Specht, F. Schon, J. Muller, B. Esser, M. Ziese, I. Anderson, and P. D”Haese, ‘Analysis of ceiling effects occurring with speech recognition tests in adult cochlear-implanted patients,’ ORL J. Otorhinolaryngol Relat. Spec., vol. 66, no. 3, pp. 130–135, 2004.
4. E.L. Berson, ‘Retinitis pigmentosa. The friedenwald lecture,’ Invest Ophthalmol. Vis .Sci., vol. 34, no. 5, pp. 1659–1676, Apr. 1993.
5. E. Zrenner, ‘Will retinal implants restore vision?,’ Science, vol. 295, no. 5557, pp. 1022–1025, Feb. 2002.
6. J.F. Rizzo III, J. Wyatt, J. Lowenstein, S. Kelly, and D. Shire, ‘Perceptual efficacy of electrical stimulation of human retina with a microelectrode array during short term surgical trials,’ Invest. Ophthalmol. Vis. Sci., vol. 44, no. 12, pp. 5362–5369, 2003.
7. M.S. Humayun, J. Weiland, G. Fujii, R.J. Greenberg, R. Williamson , J. Little, B. Mech, V. Cimmarusti, G. van Boemel, G. Dagnelie, and E. de Juan, Jr., ‘Visual perception in a blind subject with a chronic microelectronic retinal prosthesis,’ Vision Res., vol. 43, no. 24, pp. 2573–2581, 2003.
8. Weiland, J.D. and Humayun, M.S., ‘A biomimetric retinal stimulation array,’ IEEE Engineering in Medicine and Biology Society Magazine, vol. 25, no. 5, pp. 14-21, Sept.-Oct., 2005.
9. Wolpaw J.R. et al., ‘Brain-computer interfaces for communication and control,’ Clinical Neurophysiolology, vol. 113(6), pp. 767-791, 2002.

This world and its pleasures are a heavy burden. No one (except the corrupt in spirit) is contented with it. Rather than suffering from dependence on almost the whole universe, being needy of all means and causes, and appealing to contending deaf, dumb, and blind masters, people should seek refuge in a single, All-Hearing, and All-Seeing Master. If they place their trust in Him, He is enough for them.

Fourth truth

Know, O ego, that the scientific inventions woven around your head, the lines of conscious artistry connected to you, and the things put in your hands stretched out in neediness all demonstrate that your Creator, Maker, and Helper hears your sighs of destitution and your cries for help. Having mercy on you, He gratifies all your needs. Seeing that the Creator and Maker answers your tiniest cells’ calls for help, why should He ”the All-Hearing, All-Seeing” not answer your call for help?¹

Know, O spacious cell called ego or selfhood and built up of lesser cells. Say: O God! O Lord! O my Creator! O my Fashioner! O my Owner! O my Master! O my Guardian! Yours is the dominion (of all things) and to You is all praise! I am a guest in this body, Your property that You have entrusted to me.

O selfhood! Why do you claim to own that which you will never own? Give up this false claim that throws you into acute pain. Consider the emotions of pity and affection, which are among the spirit’s exhilarating embellishments: If they were left to your pretended ownership, they would harm and torment the spirit.

For example, the misfortune and calamities striking you or others would cause you to remain in continual pain and go so far as to blame Destiny for them. However, when you see a soldier who has lost his horse or whose residence has been burnt down by mistake working directly under a king, you do not feel much pity for the soldier. If you consider that both the horse and residence belong to the king, you will see that their disappearance does not cause a significant decrease in his property. Nor does the soldier worry about it”indeed, inasmuch as he is poor, it is highly probable that out of pity the king will compensate his losses with something better. In the same way, God is the All-Compassionate and always treats His servants with utmost compassion.² Therefore, compassion for creatures as creatures of God exhilarates the spirit. By contrast, pity arising from supposing that everything owns itself continually suffocates and distresses the spirit.

One with a sound viewpoint based on belief in Divine Unity sees every living being’s body as resembling a hired captain on a king’s ship being controlled by that king, who controls his property as he wills. This viewpoint does not allow one to see an ant or a honeybee as contending with attacking causes. Rather, according to it, the ant controls an earthly vehicle while the other controls an aircraft, the reins of which are in the hands of the Power of an All-Powerful One. Causes do not have much weight in the sight of either animal, which depend on the True Owner (of all things).

By saying: Surely we are God’s and surely we are returning to Him (2:156), when struck by misfortune, one means: All property is God’s and I am under His command, journeying to Him. My relation with my body, which is His property, is like that of a soldier holding something belonging to the king. When robbers attack him, he states: I am responsible for guarding this property entrusted to me. However, I am unable to guard it now. Like this property, I also belong to the king and am going to him. When those with such a viewpoint see a fellow struck with misfortune or suffer personal misfortune, they are relieved of continual distress. Otherwise, they are constantly weighed down with pain and distress.

Footnotes

1. For example, a person equipped with the limited powers of sight, hearing, and learning may conclude that the Creator must be All-Seeing, All-Hearing, and All-Knowing. One’s poverty, helplessness, and mortality may lead one to discover that the Creator is Absolutely Wealthy, Powerful, and Permanent. (Tr.)
2. The best analogy applicable to certain aspects of the relation with God and the creation is that between a monarch and his subjects. Since many immaterial truths, especially those pertaining to the Divine Being, are abstract and difficult to understand, Divine Scriptures usually use parables, metaphors, similes, and analogies. For example, God is sometimes introduced like a monarch or king, having a throne and armies. Another reason why Said Nursi used such analogies may be that he wrote this book in the 1910s, when there was still a sultanate in Anatolia. (Tr.)

Adapted from Bediuzzaman’s Epitomes of Light (Mathnawi al-Nuriya)

How Does God Hear and See?

This question raises certain difficulties. If treated improperly, it can lead to denying that God hears or sees, as in St. Anselm’s meditations on God’s Attributes.1 In his Proslogion, he introduces his famous ontological argument for God’s existence and asks: If only corporeal things perceive, because the senses exist in a body and are directed towards bodies, then how can you perceive? For you are not a body but the highest spirit, which is better than any body.(2)

He replies: But if to perceive is just to know, or is aimed at knowledge”for whoever perceives knows according to the appropriate sense, as, for example, we know colors through sight and flavors through taste”then it is not inappropriate to say that whatever in some way knows also in some way perceives. Therefore, Lord, although you are not a body, you are indeed supremely percipient in the sense that you supremely know all things, not in the sense in which an animal knows things through its bodily senses.(3)

The crucial points here are that perceiving is possible through bodily senses and that for God to perceive means to know. He seems to explain how God perceives without bodily senses by claiming that the essential outcome of perceiving is knowing. Therefore, if something were known with all details of its properties and qualities, all consequences resulting from perceiving it already would be obtained. If this were true, St. Anselm’s solution would make perfect sense. However, I argue that this is far from being true.

Perceiving and Knowing

To understand his flawed reasoning, recall the definitions of perceiving and knowing. Since we perceive only through our senses, and whatever we realize through our senses’ operation is perception, we define perceiving as a sensory-based experience. Constructing a precise definition of knowing is somewhat harder, for the word is used for too many purposes and in too many contexts. However, as a working definition of knowing something, we can say that it is having a representation of the object of knowledge in our minds.

The difference between perceiving and knowing something, if we take their meanings in the most general sense, becomes clear if we consider these processes’ temporal properties. We perceive something only when exposed to the sensory data caused by the perceived object. But if we know something, we can access this knowledge at will, provided that we do not forget it. In broad terms, perceiving is dynamic while knowing is static.

St. Anselm is right in the sense that we can know what we perceive, as expressed in: I know how banana tastes or in: I know how it feels But we can know these feelings only because we experienced them before. This is why we cannot explain color to a blind person or sound to a deaf person. Besides, knowing how it feels to see a red rose is not the same as seeing it. Let alone their dynamic versus static character, knowledge of an experience is a faint impression of the experience held in our memories.

Perceiving and Knowing in Relation to God

Our considerations about perceiving and knowing are based on circumstances relevant to human subjects. Due to the immense difference between the Supreme Being and us, we must remember that we can never know how our concepts apply to God. We only can assume that the essence of these concepts are shared by us”God knows and we know, but our knowing is a shadow of a shadow of a shadow of His knowing. So we can talk about God only through metaphors and analogies. Nevertheless, we can talk about God in a meaningful way, for we are taught about the Divine Attributes through Divine Revelation and are told that God created us in His image. Thus, being human lets us at least speculate about His nature.

In the light of the above, my main point concerning the relation between God’s perceiving and God’s knowing is that they are both existent and different Attributes, for the essence of perceiving differs from the essence of knowing. The former is a temporal experience; the latter is a nontemporal Attribute. Hence it follows that perceiving cannot be substituted for by knowing.

Realizing this, we see that St. Anselm’s solution to how God perceives without bodily senses is fallacious. To say that God perceives since He knows everything confuses the meanings of perceiving and knowing, and thus is a veiled denial of God’s seeing and hearing. Since St. Anselm’s explanation for the existence of God’s Attributes of All-Seeing and All-Hearing is invalid, or at least unsatisfactory, we must ask how God perceives without a body.

The Sense Organs

The above-mentioned question presupposes that perceiving is possible only through a body’s sense organs. This seems natural, as it is verified by daily experience. We do not witness people seeing without eyes or hearing without ears. Even though it appears obvious, the connection between perception and the sense organs is tricky. While we can say that the sense organs are somehow necessary for perception, we cannot say that they are sufficient.

To clarify this subtle point: A knife is sufficient for cutting bread, and a calculator is sufficient for multiplying 174 by 303. In other words, apart from discussing the absolute necessity in causal relations and given our universe’s physical laws, it is sufficient to have a knife or a calculator to perform those tasks. However, it is quite doubtful and even impossible for the sense organs to provide such a conscious experience as hearing a sound or seeing a color.

This may sound strange if we do not consider several stages and aspects of perception. Observations and experiments show that perception is a process initiated by the sense organs with incoming sensory data, such as a light pattern (an electromagnetic wave) or a human voice (a kind of pressure wave), and followed by evaluating such sensory data at the appropriate specialized areas in the brain. All stimuli arriving at the sense organs are transformed into nerve impulses”various patterns of electrical activity propagated through nerve cells (neurons).

Even though we do not know exactly how this sensory data is evaluated, all perceptions eventually are correlated with nothing but patterns of firing neurons in the brain. Thus, the brain represents and stores all data (e.g., color, shape, taste, softness), regardless of form, in terms of its neurons’ positions and firing rates. This is verified by stimulating various regions of the brain appropriately and watching the subject experience the corresponding sensations or feelings.

Brains and Computers

Analogous to a brain, a computer can represent and store data on its chips in terms of various electrical potentials. For example, an image can be loaded and stored by transforming its pixels’ brightness and color data into numbers so that a computer can distinguish colors and recognize patterns. Since different numbers represent different colors or color tones, a computer sees them as different objects and can discern them easily.

But unless a computer is programmed to signal when it sees green, it cannot perceive that green. It is not our recognizing, discriminating, representing, or responding to a color that makes us conscious percipients, but rather our experiencing a color. A brain or computer can have the necessary parts or circuits to represent, evaluate, and respond to a color or any other sensory stimulus. However, experiencing something, such as greenness, is a totally different and extraordinary phenomenon of perception.

Conscious Experience

How is it that anything so remarkable as a state of consciousness comes about as a result of irritating nervous tissue, is just as unaccountable as the appearance of the Djin, when Aladdin rubbed his lamp.(4)

To realize fully the essential unaccountability of conscious experience in terms of physio-chemical processes or the organization of brains and sensory organs, this kind of thought experiment might be very useful: Might your experience of red be the same as my experience of green? Sure, you might label grass as ˜green’ and the tomatoes as ˜red’, just as I do, but perhaps you actually see the grass as having the color that I would describe, if I were in your shoes, as red.(59

Considering such unique and intractable aspects of conscious experience, the most reasonable conclusion would be to treat the sentience and feelings in our perceptions as belonging to a distinct domain beyond the realm of this physical universe. Sense experience cannot be reduced to physical activities or replaced by each other. In this sense, they are simple and fundamental, such as the dimensions of space“time or the fundamental forces in physics. They are not produced, but just happen to be correlated with stimulating bodily senses and the nervous system’s resulting activity. This is just as bizarre as correlating a supernova’s explosion with my pushing the button of my pen. The only difference is that we have been accustomed to the former since we were children.

Given this, how can we explain why we have conscious experience? Science gives us no hint. One may deny sentient experience, as some philosophers of the mind do, but this is not satisfactory. The only clue comes from Divine Revelation, which teaches us of an Ultimate Creator Who is Compassionate and Merciful. Reminding us of his bounties, God says in the Qur’an: Say: He has created you and made for you faculties of hearing, seeing, feeling and understanding: little thanks it is ye give (67:23).

Once the true character of perception as a special gift of God is understood, our eyes and ears and other bodily organs cannot be considered the real sources of our bodily senses; rather, we will understand that they are just like windows of the human soul that God breathes into each person: (Remember) when thy Lord said unto the angels: Lo! I am creating a mortal out of potter’s clay of black mud altered, so, when I have made him and have breathed into him of My Spirit, fall down and prostrate unto him (15:28-29).

Only in the light of this profound truth can we have an idea of why we have so many remarkable qualities and capabilities. Being human, we are like mirrors on which the manifestations of God’s Attributes are focused. Of course, we have only the faintest copy of His Attributes, such as All-Seeing, All-Hearing, and All-Knowing. As all our knowledge is like a drop in the ocean with respect to His knowledge, our seeing and hearing are insignificant with respect to His seeing and hearing.

Since such elements of perception as seeing and hearing are not products of bodily senses but rather faculties of the human soul breathed into us by God from His Spirit, the perfect modes of seeing and hearing naturally belong to God as the Attributes of All-Seeing and All-Hearing.

Conclusion

As a final point, we stressed that seeing and hearing are temporal experiences. This raises the following question: How can an eternal God have temporal experiences? However, since investigating God’s actions in relation to time is a huge issue, we will consider it as a possible subject of future research. Here, I remark that God’s greatest Attribute is that of All-Living.

Footnotes

1. St. Anselm (1033?-1109) was an Italian prelate, Archbishop of Canterbury, Doctor of the Church, and a founder of Christian scholasticism.
2. St. Anselm, Monologion and Proslogion, trans. Thomas Williams (Indianapolis: 1996), 102.
3. Ibid.
4. Thomas Huxley, in Nicholas K. Humphrey, A History of the Mind: Evolution and the Birth of Consciousness (New York: Simon & Schuster, 1992).
5. Stephen Pinker, How the Mind Works (New York: Norton, 1999), 146.