The Role of Light in Human Consciousness and Physical Well-Being

 

Dan R. Hankins

 

Abstract

     Light plays a significant role in the development of human consciousness and physical well being.  The anecdotal evidence of a statistically significant number of subjects of Near Death Experiences suggests an overwhelmingly positive psychological response to the presence of light during their experience.  Further, the idea is advanced by ongoing NDE reports that individual consciousness itself manifests as some form of “light being” when separated from the physical body.

 

Keywords:  Light, Consciousness, Light Therapy, Seasonal Affective Disorder

  

Introduction

 

     The sun weighs one thousand trillion trillion tons and the sun is the undisputed sustainer of life on this planet.  If current scientific speculation is accurate, the life expectancy of the sun is roughly another 5 or 6 billion years, after which it will become a greatly expanded red star engulfing nearby planets like Mercury and Venus and ending all life forms on Earth in a nanosecond of scorched misery.  It takes the sun’s light rays eight minutes to reach us here on earth, so if the sun burned out this very instant you wouldn’t know it for eight more minutes when you would immediately freeze solid.  We need the sun.  We need the light. 

     Light provides a myriad of benefits to life on this planet.  We are located exactly the right distance from the sun to be conducive to abundant life on our little planet.  A shift in our orbit around the sun in the slightest would produce catastrophic results in our lives.  In the vast expanse of the universe, it is naïve to assume that there are no other planets ideally situated near a similar star capable of sustaining some form of life.  Perhaps there are many.

 

Photons and Light

 

     One of the most fascinating things the sun provides for us is a highway over which accurate and necessary information is passed.  Photons, the atomic makeup of light, are capable of bearing information across enormous distances while keeping both the order and the quantity of the information packaged on the light photons precisely as they originated.  If you look across the room at someone, you will receive their image on photons bearing the information containing their image and that image will not be a Pablo Picasso abstract with the mouth appearing where the ear should be, but rather an accurate cohesive image.  Others observing the same image will also receive an identical package of information across the light waves.  Every second of our waking lives, we depend on the sun’s light for millions of messages of information on packets of photons. 

     If there is no light, the movement of information is impeded.  That is why we can’t see a black hole.  The gravitational pull of a black hole is so powerful that anything crossing the event horizon of the black hole would need to travel faster than the speed of light to escape.  Since nothing travels faster than light, nothing escapes, not even light.  Therefore we can’t see the black hole because no light is leaving it to bear the information.  The most we can ever hope for is speculation based on the appearance of other heavenly bodies around what we suspect is a black hole.  In kilograms, the typical stellar black hole in space weighs ten times the weight of the sun.  (That’s a 1 with 31 zeros after it.)  The massive black holes that astrophysicists theorize are located at the center of galaxies weigh a million times the weight of the sun.  Furthermore, they are physical objects, and yet we can’t catch the slightest glimpse of them. (University of Berkeley website)

 

The Passageways of Information

 

     You are first inclined to argue that there are other ways to receive information.  After all, blind people can be, and very often are, very intelligent people.  Yet they live in a world absent of visible light.  That is true, but since electrical impulses are a form of electromagnetic energy like visible light, the blind also receive all their information on photon “highways” nevertheless.  Neuroscientists are enthusiastically researching practical applications for these “light energy highways.”  Currently, there have been over 20 research groups investigating the use of brain generated electrical impulses to interface with computers to perform tasks for the paraplegic (Cognitive Processing, 2005;6:65-74).  In one sense of the word, we all experience our physical surroundings in utter blackness.  A burst of light that appears in front of your face is processed and experienced in the black darkness of the far back region of your brain in the occipital lobe.  This can be readily proven, for when the part of the brain that processes vision is damaged, the light will not be experienced.  So, much like the blind person, you also experience light bearing information in utter darkness.  Remarkably, blind subjects (even those blind from birth) experiencing the phenomenon known as a Near Death Experience sometimes experience sight during their experience (Journal of Near-Death Studies, 2004;16:101-147).  This is possibly another indication that human consciousness is separate from the physical brain and is not dependent on the normal neuronal passageways for information.

     We are in the early frontiers of exploration of the relationship between our physical well-being and light.  New research indicates that the introduction of bright light to blind research subjects may positively influence their circadian rhythm by affecting melatonin levels (New England Journal of Medicine, 1995;332:6-11). 

     For those individuals gifted with vision the image coming through your eyes on information packed photons strikes the photoreceptor cells in the layer of cells at the back of your eye known as the retina.  The light expressed as visual light photons when they enter your eye are transformed into light expressed as electrical impulses when they leave the eye on their journey to the brain. 

     Because you can’t physically see electricity it is very easy to forget that it is also a form of electromagnetic energy like visible light.  Furthermore, every part of the electromagnetic spectrum – from gamma rays to radio waves - is a form of light energy.  NASA’s Goddard Space Flight Center publishes a wonderful website for young people called “Imagine the Universe.”  On that site (http://imagine.gsfc.nasa.gov/) they state, “Radio waves, visible light, X-rays, and all the other parts of the electromagnetic spectrum are fundamentally the same thing, ‘electromagnetic radiation.’’  They then define electromagnetic radiation as another form of light, further clarifying light as “fluctuations of electric and magnetic fields in the form of waves.”  So the light that enters your eye as visible light never ceases to be light even after it enters the darkness of your brain in the form of electricity.  The visible photon light, after transforming into the non-visible form of electricity, travels on the electrical wiring system of your body made up of neuron cells and is stored as electricity in your brain.

     The blind person we have mentioned bypasses the visible light step in receiving information.  Rather, sound waves will vibrate his eardrum and transfer the vibrations to the middle ear and then to the inner ear where the vibrations act upon the fluid filled cochlea.  Instantly, the vibrations and the ripples on the fluid in the cochlea reach the hair cells which we call the auditory receptor cells located on the basilar membrane.  These highly sensitive and fascinating cells transform the vibrations into electrical impulses and we are once again dealing with light.  These impulses travel to the thalamus in the brain on their way to the temporal lobe where sound is recognized and processed.

     Stand in a bakery in the morning and take a deep whiff of the aromatic air.  When the molecules carrying the odor enter your nose they find their way to the nasal mucosa located on the top of each nostril which contains sensory olfactory epithelium.  From these protrude little knobs with up to 20 olfactory cilia from 5 to 10 micrometers long with smell receptors.  The disturbance of the cilia creates an electrical impulse (light) which travels on the neuronal wireway to the thalamus and the frontal cortex of the brain where your conscious memory will determine the type of smell from your memory bank.

     If you bite down on a delicious piece of fruit, molecules escape from the fruit and enter tiny openings in your taste membrane receptors on the taste bud.  The various tastes, from bitter to sweet, have different molecular structures and the taste bud has a variety of different types of receptors to accommodate the different tastes.  The instant the molecule from the fruit attaches to the taste membrane receptor, the friction of the event produces an electrical signal and we are back to the transference of information through light.  These electrical light signals will travel the body’s wiring system to the limbic system where you will experience the food as pleasurable in this case or un-pleasurable if the fruit happens to be spoiled or tainted.  The signals will also go to the cerebral cortex to be further processed as information.  After all, you need to remember which foods you like and which foods nauseate you, so the information needs to be stored in your consciousness.

     Our skin, the neural pathway for our sense of touch, is the largest organ of our bodies.  It is covered with millions of tiny nerve endings in the dermis or bottom layer of our skin with receptors, although these receptors are not uniformly distributed on the body.  The fingers and the lips have the largest amounts of receptors.  There are many different types of receptors but the main ones detect heat, cold, pain, and pressure.  When these receptors are activated by touching something, the friction created by the object touched and the touch receptor just under the surface of the skin generates electricity in the form of these nerve impulses which then travel to the brain to be processed.  Because the receptors in the fingers of the blind person previously mentioned are so sensitive, he can run his fingers across a page of raised dots known as Braille and read as quickly as many sighted readers.   

The Role of Light in Human Consciousness

 

     In trying to perceive the nature of our consciousness, it is vitally important to remember that electricity is a form of light and that all knowledge enters our brain as light, remains a form of light energy while in our brain, travels through our bodies across a complex wiring system of neuron cells as light, and in fact, was always light and will always remain light.  This charge of electricity is the energy package that animates you both physically and mentally.  This electricity that makes up consciousness is not a product of the brain but has entered the brain as photons passing through the sensory gateways of the body.  We humans only experience a very small part of the entire electromagnetic spectrum but certain photons in that vast spectrum are apparently capable of carrying cohesive information across the space/time continuum and integrating with human consciousness.  These photons could be termed neurophotons to identify them and isolate them from other parts of the electromagnetic spectrum. The brain merely receives and processes this photon-borne knowledge and also sends the needed electrical signals throughout the body to provide coordinated animation and response.  We know that air enters the lungs but air is not the lungs; it is merely processed through the lungs.  We know that blood enters the heart but blood is not the heart; it is merely processed through the heart.  And we know that consciousness (in the form of electrical light energy impulses) enters the brain but consciousness is not the brain; it is merely processed through the brain.   Consciousness is obviously a form of light energy, therefore; learning about the nature of light is also learning about the nature of human consciousness. 

          I was sitting in a nice restaurant with my wife, my oldest daughter and her husband enjoying a quiet dinner.  Suddenly, I felt an overwhelming weakness and felt that I was going to lose consciousness.  Family members said I turned deathly gray.  This event happened right in the middle of a sentence and I could not even finish my sentence.  I had to concentrate all my efforts toward just maintaining consciousness.  To make matters worse, this same episode had been repeated a few times during the preceding weeks.  My wife took me to the emergency room.

     After several tests and procedures that did nothing to alleviate the condition, they placed a Holter Monitor on my heart and sent me home.  After 30 days of monitoring the activity of my heart the cardiologist determined that I had sick sinus syndrome and accompanying arrhythmia problems and would need a pacemaker.  When my heart rate dropped down into the low forties and upper thirties, blood flow to the brain was hampered sufficiently enough to cause the strange semi-conscious episodes I had been experiencing.  Consequently, I was scheduled to have the procedure done the following week.

     The pacemaker worked well.  Sixty times a minute it faithfully sent 3 volts of electricity into the atrium of my heart that initiated a good strong heart beat.  After six weeks the voltage was reduced to 2 volts in order to conserve the life of the battery.  The point is, whether my heart received electrical energy from my sinus node or an artificial mechanical device made no difference to the muscle of my heart.  Electricity is electricity is electricity, and this same fact needs to be remembered when discussing the electrical light impulses that constitute human consciousness.

     Biomedical Engineering researchers at the University of Southern California recently conducted studies in which they implanted an electronic microchip into live tissues of a rat’s hippocampus taken from the rat’s brain and kept alive in a Petri dish.  The purpose of the experiment was to test the plausibility of creating a brain prosthesis in the future to replace damaged hippocampus in a human brain.  The hippocampus is often affected by neurodegenerative conditions like Alzheimer’s disease.  The microchip worked well, and signals generated across the microchip matched normal neural signals in every way from shape to timing.  Researcher Dr. Theodore Berger concluded, “It proves you can take out a piece of a central brain region – a piece with real clinical interest – replace it with a chip, and get it to operate as it did before.” (Hippocampus, 1995;6:43-51).  Again we find that the physical body responds to specific electrical impulses whether they are generated by a functional brain or a mechanical device.

     In the Cleveland Plain Dealer (Thursday, July 13. 2006), an article credited to the Los Angeles Times appeared entitled, “Implanted Chip Turns Thoughts into Actions.”  The article told of a 25 year old quadriplegic who operated a mechanical arm by simply thinking about the action he wanted the arm to perform.  This incredible new technology first reported in the journal Nature, holds tremendous hope that some day people paralyzed by stroke or other mishaps will be able to feed themselves and operate their own wheelchairs unassisted. The implant was developed by Cyberkinetics Neurotechnology Systems Inc. in Foxborough, Massachusetts.  The electrical impulses created by the thoughts of the young quadriplegic Matthew Nagle were transmitted to a computer which interpreted them and mechanically performed the action thought of in Nagle’s brain.  The University of Chicago, Brown University, and Harvard University performed successful experiments with a chip containing 96 electrodes which picked up the electrical signals generated in the motor cortex of the brain.  As Matthew Nagle imagined his arm moving, this innovative chip allowed him to perform tasks with as high as 90 percent accuracy.  Again we see the integration of electricity and biology to simulate conscious tasks as mentioned earlier in this paper.

 

The Role of Light in Physical Well Being

 

     Alaskans who live in the far North go through long periods of minimal sunlight.  Residents of Barrow, Alaska may experience months of darkness without ever seeing the sun.  Citizens in these far northern areas also experience depression in far greater numbers than people in geographical areas where sunshine is present all year long.  Suicide rates are remarkably high, as well as alcoholism.  Research has found a positive relationship between increased suicide rates and geographic latitudes (Psychiatry Research, 2003;133:205-213). The study concluded that suicides were highest among peoples who lived in the northern most latitudes and received little direct sun light.

     While all this light in the form of electricity enters our brain and is stored in our consciousness, it is always in a state of activity which can be registered on an electroencephalograph (EEG).  The brain houses this supercharged field of electrical light energy which is never completely at rest, constantly dancing about across the un-insulated neuron cells that make up our brain’s gray matter.  The brainwaves are orderly, consistent, and are common to all humans regardless of age, sex, culture or country.

     These brainwaves generate frequencies as low as 1.5 cycles per second in deep, dreamless sleep when Delta waves are generated, and frequencies up to 40 cycles per second in the alert state of activity such as conversation or active debate when Beta waves are generated.  There are other states of mind with their own particular wave lengths.  When we are relaxing or in deep thought our brains drift into Alpha waves with frequencies from 9 to 14 cycles per second.  When we become drowsy and begin to daydream during the day our minds are in the Theta state with frequencies from 5 to 8 cycles per second.

     The human brain operates in an orderly fashion with a high level of independence from the physical world.  For instance, we dream in 90 minute cycles when our brainwaves rise to a higher frequency and begin to produce dreams with accompanying rapid eye movement (REM).  Some people upon awakening stay in the theta state for a few minutes.  This particular state of mind with accompanying theta waves is a highly productive time when the mind can produce remarkably profound ideas.  Many great scientists and philosophers have generated exciting new concepts from this particular state of mind.  It should be noted that intelligence is not determined by the particular frequency of a brainwave.  While in deep, dreamless sleep all the intelligence of the consciousness remains intact though not in active use.  We do not have to relearn and refill our data base of knowledge upon awakening.  The intelligence remains in the electrical light energy field to be used when needed upon awakening.

     Sleepwalking (somnambulism) can occur at any age but primarily affects children between the ages of six and twelve.  Often this state is brought about when an individual is awakened from deep, dreamless sleep.  The eyes remain open, the facial expression is blank, the somnambulist will carry on activities, and upon awakening will be disoriented and confused.  If the sleepwalker speaks, the language will generally be incomprehensible and seemingly without intelligent intent.  Sleepwalkers have been reported successfully performing remarkable tasks such as driving a car and making a midnight snack – all while asleep. 

     On several occasions sleepwalkers have committed serious crimes, including murder, and somnambulism has been used as a legal defense since 1845 when Albert Tirrell from Weymouth, Massachusetts killed his mistress Maria Ann Bickford because she refused to give up her job as a prostitute in a Boston brothel.  Tirrell’s attorney successfully defended his client with the defense that Mr. Tirrell was unaware of his activities because he was sound asleep, in spite of the fact that he had almost severed Miss Bickford’s head and then tried to burn the brothel down.  It took the jury less than two hours to find the defendant not guilty.  He was tried a second time for arson and an entirely new jury arrived at the same verdict – not guilty because the defendant was sleepwalking.  Shortly after his acquittal however, Mr. Tirrell was sentenced to three years for “adultery and lascivious cohabitation” to which he had earlier pleaded nolo contendere (The Boston Post, September 30, 1845).

  Apparently there is a great deal of research still to be done to determine how the intelligence residing on the electrical field of the brain is accessed.  It obviously does not require a state of wide awake consciousness. 

    Our body has a unique relationship with light.  Not only is light the “stuff” of intelligence (and thus consciousness) but we have a yet-to-be-understood fellowship with light on the physical level.  Light is the first treatment in psychiatry to evolve directly out of modern neuroscience.  Light Therapy has been as effective as drugs for some psychiatric conditions. (Archives of General Psychiatry, 1998;55:861-862)

The Promise of Light Therapy

 

     Millions of people suffer from a disorder known as Seasonal Affective Disorder (SAD) which appears to be directly associated with the amount of sunlight one receives.  When there is a decrease in the amount of light we experience the brain sends signals to the pineal gland to increase melatonin hormone production.  Melatonin is a hormone common to every living thing from the simplest plants to the most complex animal, and melatonin is synthesized by an amino acid derived from serotonin.  There is a direct link between the amount of sunlight and darkness we experience and the amount of melatonin in the brain; furthermore, there is a direct link between the amount of melatonin in the brain and depression.  Light Therapy has become increasingly promising in the treatment of SAD (Journal of American Medical Association, 1998;280:1556-1558) (Psychological Medicine, 1998;28:923-933) (Archives of General Psychiatry, 1998;55:875-872, 1998;55:883-889 and 1998;55:890-896).  Presently about half of all United States insurance companies compensate patients for “light therapy,” while some nations (Switzerland, for instance) require insurance companies to reimburse if “light therapy” is prescribed by a physician.  Light Therapy consists of incremental, timed exposure to an electrical “light box” which produces a very high output of white light from 1200 to 5700 lux.

 

Light and the Near Death Experience

 

     In the light therapy studies referenced in this paper, the introduction of light elicited a positive psychological response of enhanced well-being to a statistically significant number of research subjects presenting with Seasonal Affective Disorder (SAD).  This finding is intriguing when compared to the number of Near Death Experiences (NDE’s) that mention the presence of light in their experiences (Life After Life, 1975) (Lancet 2001;358:2039-2045).  In cultures far removed from the Judeo-Christian influence prevalent in the west, such as India, light is still mentioned by those experiencing NDE’s (Journal of Near-Death Studies, 1993;11:205 -217).

  This light, when introduced into the NDE, brings with it enhanced feelings of well-being and peace in a large majority of the experiences thus far reported.  Given the significant role that light, in the form of electromagnetic energy, plays in the introduction of knowledge into human consciousness, it is interesting that a number of NDE’s are accompanied by the intense desire to “enter” the light and the feeling that they are “one” with the light.  Also of great interest is the often repeated report of feeling a great expanse in knowledge by the NDE subject.  Could there be a profound sense of “belonging” experienced by the NDE subject because the subject’s own consciousness is also made up of electromagnetic energy bearing intelligence?  Does this advance the idea of light having intelligence as proposed by Baumann?  (Journal of Near-Death Studies, 2005;23:197-205).

     In 1974 astronomer Carl Sagan, convinced that the mathematical probability was compelling that life existed on other planets, championed an effort to contact extraterrestrial intelligence.  The program that resulted, Communication with Extraterrestrial Intelligence (CETI), beamed a binary message composed by astrophysicist Frank Drake and Sagan toward the M13 star cluster 21,000 light years away.  Why would they choose this method of communication?  It is self-evident that these scientists understood that a bundle of information packaged on photon energy (like their binary radio signal) would reach a destination 21,000 light years away intact.  Sagan and Drake rested on the convincing argument from quantum physics that their signal would endure probably to infinity.  This same principle may apply to the photons bearing the information within our bodies that we recognize as our individual consciousness.  Though we don’t understand how or why, apparently intelligence borne by photons is cohesive, perhaps to infinity.  Would this mean that photons bearing intelligence are somehow attracted to one another to form a cohesive packet of intelligence rather than a random field of undisciplined noise?  Does the electromagnetic energy that bears information within the physical body follow this same law of physics?  Could it possibly also endure perpetually and cohesively when released from the physical body?  Could the sum total of human consciousness be equal to the sum total of the electromagnetic energy within the physical body?  Many individuals who have a Near Death Experience report an overwhelming urge to merge with the light which they describe as “all knowing.”  If the NDE subject’s individual consciousness is in fact made up of a field of electromagnetic energy bearing intelligent thought, perhaps the normal response would be for one field of intelligence to merge with another field of intelligence, just as one photon of Sagan’s binary code was attracted to another photon creating a cohesive intelligent message capable of perpetual existence.

     Light is also being used to treat sleep disorders associated with shift work and jet lag.  Further studies are being done to investigate the role light deprivation has in bulimia nervosa and premenstrual dysphoric disorder because these disorders are quite often accompanied by SAD.  Bulimia victims seek help for their condition in January more than any other month in the year.  Whole new protocols of “light treatment” are under intense scrutiny by the medical community, and it remains to be seen how closely our biological parts actually resonate with the light we experience.

     There has been a marked decrease in the amount of sunlight we get in the modern world with fear of skin cancer and the comfort of indoor controlled climates being motivating factors.  Interestingly, there has been a clear increase in obesity and over eating.  With that in mind, it is interesting that winter SAD is often accompanied by overeating, craving for carbohydrates, and weight gain.  Research subjects with SAD and bipolar affective disorder, especially bipolar II, list overeating and carbohydrate craving as presenting symptoms (Archives of General Psychiatry, 1984;41:72-80). 

Conclusion

 

The scientific study of light treatment in the treatment of disease, particularly psychological disorders, is in its infancy.  Sadly, there appears to be a reluctance to spend significant time and resources on this area.  Since the advantage of antidepressant drugs over placebos is so small in numerous controlled studies, and since “light therapy” has repeatedly shown promise, more study in this area is needed.  The study of the Near Death Experience is also young and the research field is crowded with psychologists, psychiatrists and cardiologists.  While quantum mechanics has been introduced into the study of NDE’s (Journal of Near-Death Studies, 2004;18:143-179) there is still an appalling lack of serious, well-funded research into human consciousness and the Near Death Experience by researchers in the field of quantum mechanics.  Given the overwhelming role of light in Near Death Experiences as well as the obvious relationship between light, intelligence, and human consciousness, this is a deficiency that desperately needs to be addressed.

 

References

 

Baumann T, The significance of light in the near-death experience. Journal of Near-

Death Studies, 2005;23:197-205.

Björkstén K, Bjerregaard P, Kripke D, Suicides in the midnight sun – a study of

seasonality in suicides in West Greenland. Psychiatry Research, 2003;133:205-213.

Blackmore S, Near-death experiences in India:  They have tunnels too.  Journal of Near-

Death Studies, 1993;11:205 -217.

Boston Post, author unknown, Municipal Court Column, September 30, 1845,

http://www.assumption.edu/dept/history/Hi113net/his213/MariaBickfordMurder.html.

Bunn T, Black Holes; Frequently Asked Questions. University of Berkeley website,

http://cosmology.berkeley.edu/Education/BHfaq.html, September 1995.

Czeisler C, Suppression of melatonin secretion in some blind patients by exposure to

bright light. New England Journal of Medicine, 1995;332:6-11.

Eastman C, Young M, Fogg L, Liu L, Meaden P. Bright light treatment of winter

depression: a placebo-controlled trial. Archives General Psychiatry. 1998;55:883-889.

Elkin I, Shea T, Watkins J, Imber S, Sotsky S, Collins J, Glass D, Pilkonis P, Leber W,

Docherty J, Fiester S, Parloff M, National Institute of Mental Health Treatment of

Depression Collaborative Research Program: general effectiveness of treatments.

Archives General Psychiatry, 1989;46:971-982.

Implanted chip turns thoughts into actions. The Plain Dealer, July 13, 2006.

Kleber B, Birbaumer N, Direct brain communication: neuroelectric and metabolic

approaches at Tübingen. 2005, Cognitive Processing, 2005;6:65-74.

Lamberg L, Science and Light Therapy. Journal of the American Medical Association,

1998;280:1556-1558.

Lewy A, Bauer V, Cutler N, Sack R, Ahmed S, Thomas K, Blood M, Latham J, Morning

vs evening light treatment of patients with winter depression. Archives of General

Psychiatry, 1998;55:890-896.

Lundahl C, Gibson A, Journal of Near-Death Studies, 2004;18:143-179.

Moody R, Life After Life, Mockingbird Press, 1975, Covington, GA..

Ring K, Cooper S, Near-Death and Out-of-Body Experiences in the Blind: A Study of

Apparent Eyeless Vision. Journal of Near-Death Studies, 2004;16:101-147.

Rosenthal N, Sack D, Gillin J, Lewy A, Goodwin F, Davenport Y, Mueller P, Newsome

D, Wehr T, Seasonal affective disorder: a description of the syndrome and preliminary

findings with light therapy. Archives of General Psychiatry. 1984;41:72-80.

Ruhrmann S, Kasper S, Hawellek B, Martinez B, Höflich G, Nickelsen T, Moeller H,

Effects of fluoxetine versus bright light in the treatment of seasonal affective disorder.

Cambridge Journals, 1998;28:923-933.

Terman M, Terman J, Ross D, A controlled trial of timed bright light and negative air

ionization for treatment of winter depression. Archives of General Psychiatry,

1998;55:875-882.

Thiels E, Xie X, Yeckel M, Barrionuevo G, Berger T, NMDA Receptor-dependent LTD

in different subfields of hippocampus in vivo and in vitro. Hippocampus, 1995;6:43-

51.

Van Lommel W, Van Wees R, Meyers V, Elfferich I. Near-death experience in survivors

of cardiac arrest: a prospective study in the Netherlands. Lancet, 2001;358:2039-2045.

Wirz-Justice A, Beginning to See the Light. Archives of General Psychiatry,

1998;55:861-862.

 

 

Dan Hankins is the webmaster of The Opus Lux Project, which explores the relationship between light and human consciousness (http://www.OpusLux.com) and can be reached by e-mail at h122048@hotmail.com . 

 

 

 

 

 

 

 

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