Introduction

Audio Visual Stimulation (AVS) Technology plays a large role in the cognitive revolution that is
sweeping through the 21st century. Although the use of sound and or light for healing, relaxation
and achieving altered states of consciousness (ASC) has been used for centuries, it's only
recently that the scientific community has reawakened to its phenomenal potential.

AVS Technology is related to EEG Neurofeedback and Biofeedback technology. While EEG
Neurofeedback is more of a precise system of brainwave stimulation (BWS) reading and delivery,
AVS provides a more general application of BWS.  EEG Neurofeedback is also much more
complicated of a system to work with and as a result it requires specialized, extensive training for
usage.  Not to mention EEG Neurofeedback is also a much more expensive system to work with. 
The good news is that you can achieve similar results, though more general with an AVS system
and if you decide to go into the field of EEG Neurofeedback, you will have learned much of the
information through your study and experience with AVS technology.

There is a difference between biofeedback and AVS. Biofeedback is used to condition the nervous
system, while AVS stimulates specific patterns of activity in the brain.  With biofeedback you
become aware of processes normally unavailable to conscious inspection. The awareness
includes understanding how it feels to increase or decrease the selected process (a state of
relaxation or arousal). In the end, both will get you to the same destination but the journey differs.

In this module, we will focus on using AVS for brainwave entrainment.

AVS Technology
Advanced Cognitive Technology Series

by Marisa Broughton, MPNLP, CMH

Benefits of Using AVS

Although results vary with the individual, the results on a whole have been favorable. Some of the
benefits of sound and light brain entrainment reported are:
ü Increases in I.Q. especially in children with ADD
ü Improved memory and attention span
ü Reduction of stress
ü Better results in meditation (deeper trance achieved)
ü Pain management and relief
ü Addiction relief
ü Replace lost sleep, reduce fatigue
ü Higher scores on tests
ü Improved cognitive ability
ü Accelerated learning
ü Easier access to hypnotic state

The more control you can acquire over your brain states, the more emotional and mental control
you acquire over your life.

Brainwave Entrainment


Our senses take in information which is processed by our brain, which in turn directs our thoughts
and emotions. These states of being are reflected by our brainwaves. When you change your state
of mind, you are also changing your brainwaves. Likewise, if you change your brainwaves, your
state of mind will also change. It is this latter principle that Brainwave Entrainment is based on.

The thalamus, a structure in your brain, acts as a pacemaker which essentially tells the cortical
neurons to fire in a particular pattern (or frequency). These neurons synchronize with each other
and this activity is known as the "frequency Following Response" (FFR). The FFR is likened to a
neurological game of follow the leader as the cortical neurons fall into harmony with each other.
What is interesting about the FFR is that if an outside rhythm is introduced, the other cortical
neurons will synchronize themselves to that beat.

Audio Visual Stimulation (AVS) is a tool that creates a FFR by exposing the brain to a set of desired
frequencies. Headphones deliver the frequencies through sound applied directly to the ears and
specialized light frames deliver the same frequencies, this time though pulsing light, to the visual
cortex through closed eyelids. These external frequencies act as a neurological pied-piper by
coaxing the brainwaves to follow them into a desired state.

"The FFR that the mind experiences through light and sound stimulation provides a focus for the
brain. This focus safely quells any internal dialogue or "brain chatter", and enables the listener to
reach more quickly and effectively the optimum state of mind targeted for the task at hand [i.e.
energizing, learning, relaxing, etc.]."  [source: Mind States 2: An Introduction to Light and Sound Technology by Michael
Landgraf].

Studies have shown light to be a more powerful method of delivery than sound; however, some
people [especially those who are light sensitive] do respond more favorably to sound entrainment.
Sound entrainment is also useful in situations where light entrainment isn't possible, such as
times when you want to work at your desk.

Some companies offer "open-eye" light frames and claim this is a good alternative when you want
to continue working while enjoying a session.  Personally, I find this method far to distracting, not
to mention difficult to work with especially when trying to read or work on the computer and prefer
using just the sound.
A brainwave is a electrochemical rhythm which occurs across the surface of the brain known as the cerebral cortex. This rhythm measures cortical arousal which reflects a corresponding state of mind.
A brainwave is measured on the surface of the scalp where all the bioelectrical activity occurs. The cerebral cortex makes up 80% of the brain's mass.
This biochemical electricity is produced in the brain through frequencies measured in hertz. "hertz" is measured as beats per second.
We categorize groups of these frequencies according to the range that is associated with various groups of mind.
These frequencies correspond to four measurable groups of frequencies named: Beta, Alpha, Theta and Delta. Within the Beta group are two subgroups - Gamma, which is High Beta (24-70 Hz) and SMR (Sensory Motor Response) which is also known as Low Beta (12-15 Hz).
Even though all four frequency groups are found in the brain at all times, there will always be one or two dominant groups of frequencies. Through entrainment, our goal is to make the desired frequency a dominant frequency at the desired time.

A variety of conditions can cause the brain's frequency system to produce too much or too little of the appropriate frequencies needed to function properly. For example, it's been found that people with addiction problems tend to have an insufficient amount of Alpha activity. Another example is people with attention problems tend to have Theta waves dominant when SMR would be more appropriate. A further example is people who have problems getting to sleep tend to have Beta waves dominant when Theta or Alpha would be more useful.
When creating a program, it's best to use the range of frequencies in the target area instead of producing segments focusing on one frequency for three reasons:
1. Habituation easily occurs when you use only one frequency, thus making the treatment less effective.

2. Not ever person responds the same way to a frequency. For example, while 10 Hz may produce the desired effect in one person, 11 Hz will produce the same in another. 

3. Along the same line as habituation, the brain tends to get bored if exposed to the same frequency for too long. Boredom will detract from the effectiveness of a session.
Brainwave Frequencies Overview



"There are studies which support the use of frequency "sweeps" vs. Fixed frequencies; in fact this approach was included in a patent held by Dr. Harold Russell, Dan Vaughnn and myself [Robert Austin]. One common misconception which has propagated in the AVS field is that there are very precise frequencies which produce specific esoteric or medical effects. Though there is some basis for this [i.e., Tansey uses and touts 14 Hz neurofeedback for ADHD, though others more generally use the SMR rance of which 14 Hz is a component), it is very unlikely that a fractional Hz will produce the same effect on everyone. That's why we made teh Proteus [and Procyon] programmable - the included sessions are intended as much as examples as anything else." [source: Robert Austin email 10/28/06



Frequency Correspondences


As you'll notice from the list below, each group of frequencies has its benefits as well as detriments.
Where people get into problems, and this is where AVS entrainment is helpful, is when the brain
gets stuck in an inappropriate state. The state is inappropriate because it is either excessive or
deficient in a frequency range or it is producing a range of frequencies at an inappropriate time (for
example, theta when a person is trying to concentrate).

One of the most important things to learn about AVS Technology is which states are associated
with what conditions. Having a good working knowledge of this will make treatment decisions
much easier.

The following frequencies are associated with the following states of mind:

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Gamma (High Beta) 25 - 75 Hz

Gamma is associated with conscious perception.

There hasn't been much research conducted in the area of Gamma waves as it was only recently
that AVS machines were capable of generating frequencies in this range.

Some claim that Gamma is associated with the deepest states of meditation relating to that which
monks who train for years achieve.

If you are going to create a program that has Gamma in it, you'll want to keep the Gamma segments
fairly brief as too long of a period of Gamma can create anxiety.

Excessive Beta (all levels):  Beta is elevated in all stress-related disorders, some mood disorders, panic, anxiety, fear and
chronic pain.

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Beta (Middle Range) 16 - 24 Hz

Training in this area can increase mental clarity, focus, alertness and IQ.

Associated with psychological  arousal and increased response to threat.

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SMR (Low Beta) 12 - 15 Hz

A calm, focused brain usually operates at about 13 Hz.

This state is associated with relaxed focus and attention.

When we are awake and alert, Beta is the "normal" dominant frequency.

The benefits of Beta training are improved concentration, cognitive ability and focus.

People who have ADD/ADHD are typically deficient in the Beta frequency and that is why they
cannot concentrate or remain focused. Their brains tend to have Theta as the dominant frequency
and while you'd think that would make them calmer, it is not so. In fact, things tend to work opposite
with them; stimulants calm them , which is why doctors prescribe Ritalin (which is a stimulant).
These people do respond well to AVS treatments.

Some experiments have found that SMR training can help people with epilepsy reduce seizures.
NOTE: A practitioner should never attempt to treat epilepsy with AVS unless you are a doctor or are
working with a doctor who has experience in this area because in some people, especially those
with photo-sensitive epilepsy, AVS exposure can induce seizures instead of curing them. 

Deficient in SMR: ADD, stress-related disorders, chronic pain, depression, mood disorders, psychotic states, substance
abuse, panic, anxiety and fear.

Did you notice that too much and too little both produce similar negative effects?

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Alpha  8 - 13 Hz

Alpha is the first bridge between the conscious and unconscious mind.

Necessary for creativity and positive thinking.

Associated with relaxation and visualization.

Alpha waves are deficient in alcoholics, their children, individuals with a history of abuse (and their
children) and those with depression and/or anxiety.

A person low on Alpha tends to feel frustration. With no alpha, we lack the conscious ability to
express ourselves because the information from the unconscious to conscious realization is
blocked.

The frequencies of Alpha are associated with harmonization with the Shuman Resonance - the
frequency of the earth’s electro-magnetic field (7.83 Hz. +/- 0.5 Hz.). This is where that feeling of
being connected to the universe comes from because you are in synch with the universe (at least
the earth) at that moment.

Conditions that lower Alpha waves: Hypothyroidism, Hypoglycemia, renal & hepatic disorders.

Drugs that increase Alpha waves: Antidepressants Hydergine and Oxiracetam.

Drugs that lower Alpha waves: Anticonvulsants and Antipsychotics.

Best for learning new information, facts and data. Material that the learner wants to remain in
consciousness and have access to readily.

Deficient in Alpha: People with addictions, chronic pain, stress disorders, fear, frustration and depression.

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Theta: 4 - 7 Hz.

Theta is an essential state for processing information. It is in this state where information is allowed
to enter the long term memory.

Alpha/Theta is associated with learning, creativity and memory.

In Theta, the doorway to the unconscious is open and one is capable of achieving deep spiritual
insight.

The unconscious governs memories, sensations and emotions. Theta is the best state to do work
in these areas.

Theta is a useful state to use in working with people with PTSD.
Childhood memories and repressed memories can resurface.

“…the mind has an innate ability to release only the amount of information that can be handled and
doesn’t pour everything out all at once and overwhelm the person. And because they are in a quiet
state, people don’t have a flashback or re-experience the trauma, they become emotional, and
they’ll cry but they won’t re-experience. They process it cortically. Once the memory is reprocessed
cortically, in the conscious mind, the shock to the brain seems to be largely over.” (A symphony in
the Brain, pg. 171).

In this state, the conscious mind can be re-scripted.

It’s the best state for hypnotic work. 

Mental fatigue occurs when the ratio between sodium and potassium are out of balance. 15 minutes
in a theta program helps restore this balance and diminish mental fatigue.


Excessive Theta: People with head injuries and trauma, ADD, ADHD, delusion, poor reality testing, psychotic states and
seizure disorders.

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Delta: .5 - 3 Hz

Associated with restorative sleep and healing.

Body releases natural opiates. Good state for pain management.

Pituitary releases growth hormone.

Delta is predominant in children up to the age of 4.

Excessive Delta: Head injury, coma, fetal alcohol syndrome, immune disorders, severe substance
abuse, severe anxiety and major vegetative depression.

Excessive slow wave activity indicates attention problems.
Lights

LED Colors

AVS machines come with different colored LEDs in the light frames. The Procyon’s light frames contain LED colors:
Red, Green and Blue. The Proteus comes with Red & Green LEDs in its light frames but other colors such as Blue/Red,
White and Blue are available.

Certain colors are associated with particular states and while the LEDs that come with the machines can produce a
combination of colors, it is still good to have a working knowledge of what colors are best for what circumstance -
especially if you get into writing your own AVS programs.

The brightness of the lights will increase stimulation and making changes to the brightness of the lights can aid in
increasing attention.

Blue
ü Better for people with photosensitivity
ü Enhances Alpha
ü    Increases relaxation

The color blue has been reported to block the production of melatonin which means that blue is excellent for
relaxation and hypnosis sessions but not good for sleep.

Red
ü Produces optimal EEG in the band of 17-18 Hz (Beta)
ü Can suppress Alpha
ü Increases vigilance
ü Beta stimulation

Green
ü Increases SMR
ü Increases relaxation

Amber
ü Good for SMR
ü Red & Green together produce Amber

“To the eye-brain system, there is no difference in physiological & psychological response to
yellow light and a mixing of red/green light. The brain has no means of distinguishing between the
two physical situations.” [Source: Article - Color and Vision (tutorial)  The Physics Classroom ]

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Why Light Brightness is varied in a program:
Source: Robert Austin, creator of Mindplace Products.

Changing the color brightness can change the apparent color (Proteus and Procyon).

Brightness is associated with stimulation, and if the lights are on full all the time, the session may
become too stimulating and not relaxing enough.

Changing brightness can help keep the subject from falling asleep during a session. You may
want them to go into a deep trance but you do not want them to fall asleep.

Users should always keep their eyes closed while running a session and if the light is too bright,
they should turn it down.

Note: Some people are more light sensitive than others and the practitioner should always check
with the client to insure that the light levels are comfortable before running the session.


Sound


Types of Sounds
Our hearing is limited to 20 - 20,000 Hz.  Notice that most of the important entrainment frequencies
are below what we can actually hear.  What is important to note is that it is the pulse of the tone
which creates the frequency, not the pitch (sound).  So what you are actually hearing is the pitch of
the pulsed tone or frequency, not the frequency itself.

There are basically three types of beats you will hear about: Monaural, Binaural & Isochronic.
A Monaural beat is a simple beat like that produced by a drum. Monaural beats are usually what
you’ll find with any music.

An Isochronic beat is a monaural beat that is evenly spaced. Although, there have been studies
that show binaural beats to be superior to Monaural or Isochronic, there are many people who
favor Isochronic beats and claim to achieve favorable results using them.

If you hear a series of frequencies, let’s say through your stereo, your brain will group the
frequencies together or choose a mid point between the frequencies to entrain to.

Binaural Beats
A Binaural beat is a perceived beat which is created by exposing one ear to one frequency and the
other ear to a different frequency. The frequency perceived by the brain is the difference between
the two frequencies. So for example, if you expose one ear to 110 Hz and the other ear to 100 Hz,
the frequency that the brain perceives will be 10 Hz.  You can only perceive a binaural beat if you
are wearing headphones or have speakers placed by each ear. If your left ear can hear what is
going into your right ear, you will perceive the frequency as a monaural or isochronic beat. In order
for your brain to create a binaural beat, it must hear different frequencies in each ear.

“The binaural beat is perceived as a fluctuating rhythm at the frequency of the difference between
the two auditory inputs. Evidence suggests that the binaural beats are generated in the
brainstem’s superior olivary nucleus, the first site of contralateral integration in the auditory
system (Oster, 1973). Studies suggest that the frequency - following response originates from the
inferior colliculus. This activity is conducted to the cortex where it can be recorded by scalp
electrodes.” [source: The Science of Audio Based Brainwave Entrainment ]

In one study at the University of Wisconsin-Madison findings indicated that people with
depression had a less active left hemisphere. Given this information, a possible treatment for
depression would be to use an Alpha based program that uses binaural beats since the nature of
binaural beats is to get both hemispheres working together. [Scientific American Article: Train Your Brain by Ulrich Kraft]

“Dual BBs will often (but not always) produce monoaural beats as well, since two tones are
present in both ears. One exception is to keep the frequency relationships set to harmonics, for
example, 200 & 400 Hz left and 206 & 412 Hz right.

When T.B. {Budzynski) was running SynchroMed, we tested several kinds of beats: binaural, dual
binaural and monaural. The BB’s were the only ones which could cause discernable EEG
activation. We were surprised that dual BB’s did not appear to do so - but the experiment was
small.

Dr. Len Ochs once measured the effect of a constant BB and ramping lights; both induced EEG
activation at their set frequencies. Light produced a stronger effect than sound.” [source: email - Robert
Austin, May 30/06]

Pitch variance

The pitch of the pulsed tone doesn’t have much (if anything) to do with entrainment - only the
pulse rate. The real reason for varying the pitch for normal pulsed sound is to provide variety and
prevent (or reduce) sensory habituation, which can occur when the same stimulus proceeds for
too long. [Source: Robert Austin]

Seizures and Medical Warnings


Who shouldn’t use AVS machines?
People who have a history of seizures. People who tend to get headaches from bright lights.
Anyone who has a concern should check with their doctor fist.

Products which incorporate flickering light should not be used by individuals with epilepsy or
seizure disorders unless so directed by a medical doctor.   They may also be unsuitable for use by
those taking many forms of psychoactive drugs and those who have suffered from head injuries.

Photosensitive Epilepsy
PSE is fairly rare. It affects approximately 1 out of every 14, 000 people. Watching TV or playing
video games tends to set off these seizures. Discos with strobe lights are definitely out. The longer
the exposure to the source, the more likely a seizure will occur.

People who are light sensitive or sensitive to certain visual patterns do not have PSE.

Red is the most provocative color, while blue is the least.

Not all epileptics are photosensitive, which means not all epileptics will have a seizure when using
AVS.

Note: It is still important to take caution when working with epileptics and make sure you do so
under the guidance of their physician.

Reference:  L&S Systems & Seizures by Ray Wolfe. AVS Journal.com.

Children and Seizures
“Children are more likely to have both epileptic and non-epileptic seizures. Dr. Russell has treated
hundreds without a problem (pre-teen to early teens, mainly), but he’s trained to evaluate the
likelihood of such an event.

When dealing with Teens or Children, it is suggested to have a licensed practitioner supervise the
process; screen for family history of epilepsy, etc.
Children’s EEGs are slower than adults, and I would make the assumption that unless there is
some aberration which could be possibly treated (a medical decision), it’s best to find an
alternative treatment.  [Source: R. Austin, email: May 22, 2006]

Note: It should be noted that many children have had seizures from video games and sometimes
watching TV (because of the flicker rate of the screen).

Any information in these pages is a result of a collection of knowledge from various sources. This
information is not a substitute for medical advice or treatment. If you are planning to use AVS to
treat any medical conditions, please check with your physician first.  Due to FDA regulations we
make no medical claims regarding any Mindplace Products. The information in these pages can
refer to medical procedures such as EEG Neurofeedback and not necessarily AVS.

Appendix 1

Noteworthy Quotes:

They (mind devices) are being used by scientists, educators, physicians and psychologists for everything from accelerated
learning & athletic peak performance training to remediation of chronic medical and psychological problems. And all of these
applications are based on the simple premise of making the brain more mentally fit - promoting awareness and control of the
basic cycle of cortical relaxation and activation and the flexibility to move within the cycle at will. Source: Exercising Your Brain for
Peak Performance by Dennis Campbell: Total Health, Aug 96, Vol. 18, Issue 4, pg. 34.

Harold Russell, Ph.D. - reported research that showed L/S at Beta frequencies 18-21 Hz appeared to improve the cognitive
functioning of ADHD children.” Reported at the Association of Applied psychophysiology & biofeedback annual meeting in Dallas,
Texas - 1991.  Source: The Clinical Guide to Sound & Light by Thomas Budzynski (see reference).

Brainwave training has been found to yield excellent results in facilitation of human memory, attention span, and relaxation
(Hutchinson, 1994). Furthermore, this research has been demonstrating brain-wave training as an effective intervention in impaired
levels of functioning due to ADHD, learning disabilities, physical brain trauma, & psychological trauma (Ochs, 1993). Source: An
Empirical Investigation into the Effect of Beta Frequency Binaural Beat Audio Signals on 4 Measures of Human Memory by Richard Kennerly.

Entrainment is the process of synchronization, where vibrations of one object will cause the vibrations of another object to
oscillate at the same rate. External rhythms can have a direct effect on the psychology and physiology of the listener. Source:
Audio Visual Stimulation (AVS) Technology, November 7, 2009By Octavio Urzua

The device [mind machine], with appropriately selected stimulation protocols has been observed by us to be an excellent
neuropathway exerciser. … Furthermore, the long-term effects of regular use of the device on maintaining and improving cerebral
performance throughout life and possibly delaying for decades the deterioration of the brain.  Robert Cosgrave Jr. Ph.D., M.D. Source:
Time Flashes: A Short History of Sound & Light Technology by Michael Hutchison, pg. 6.

Appendix 2

Misc. Information about AVS, Brain Entrainment etc.

Studying and using AVS:

Study information that you want stored in long term memory before your AVS session.

After studying, select a Theta based program that is between 30 to 60 minutes. Ideally you want to give your brain enough time to
process the new information thus allowing it to become committed to long term memory

The Schumann Resonance
Source: Internet article: Dr. Schumann and Your AVS Machine: Surfing the Schumann Resonance by Jeff Labno

Dr. Schumann was a physicist in the 50s who discovered that there was an atmospheric resonance caused by lightening storms.

This resonance is at the frequency of 7.83 Hz and it fluctuates daily +/- 0.5 Hz.

People associate this “resonance” with being in balance with the earth. Some call it the “Earth’s Frequency”.


Wave Forms
[Source: Robert Austin]

Sine Waves have no harmonic content and tend to elicit following responses at their frequency alone (though this is not always
the case, as there appear to be “resonant modes in the brain).

Pulse waves tend to produce harmonics in the EEG, and in fact, both the rising and falling edges of the light produce visual
evoked potentials, which could either add or interfere with one another (enhancing or reducing the effective harmonic content).
Pulse waves also evoke crisper visual imagery than Sine. Pulse waveforms are best for energizing programs and Sine for
relaxation.

Cortical Evoked Response (CER) - when stimulus is repeated (above 4 Hz) the brain begins to synchronize to the
stimulus.

Brain Wave Entrainment is sometimes referred to as: flicker stimulation, photic driving, cortical evoked response, visual
evoked response, variable frequency photo stimulation, brain wave synchronization, Neurofeedback.

Berger Effect - When people open their eyes, alpha decreases.

Appendix 3

Qualifying Research

The internet can be a good source of information but it can also be a source of false or misleading
information. Many companies that sell products produce their own research, which can be biased,
especially if their “research” concludes superiority in their product.  Their product may very well
be a good product but the research is questionable because there is a conflict of interest between
the research conducted and the company’s interest in promoting their product. 

If the research has been conducted by an independent party who doesn’t stand to gain financially
from the findings (through sales of machines) it is likely that you will get more valid research. It is
acceptable for a company to post those kinds of results on their web site or in their literature.

Another thing that often happens is that the research may be valid but the author of the article has
misinterpreted the findings of the research.

Do not believe everything you see.  Look at all research with a skeptical eye and question anything
that doesn’t make sense.  My rule of thumb is to look for more than one (unrelated) source for the
information.  Make sure that science, not philosophy or belief, backs the claim made. Finally,
testimonials are not valid research. They have their place, which is in advertising and sometimes
change work, but they are not accepted in the scientific community as a scientific method of
producing evidence.

Appendix 4

Sleep
Reference: Neuroscience: Exploring the Brain, Second Edition by Mark Bear, Barry Connors, Michael Paradisco

REM  Sleep

ü Dreaming
ü EEG looks more awake
ü 25% of sleep spent in this stage

Non REM Sleep

ü Slow wave sleep
ü Designed for rest
ü 75% of sleep spent in this stage


Non REM Sleep is divided into 4 Stages which occur in a 90 minute cycle.

Stage 1:  Transitional sleep. Alpha begins to slow. This stage is fleeting, lasting only a few minutes.
Stage 2: Five to fifteen minutes,  12 - 14 Hz, occasional 8 - 14 Hz.
Stage 3: Delta - EEG = 3Hz
Stage 3 and 4 last around 20 to 40 minutes.
Stage 4: Delta - EEG = 2Hz or less

The First sleep cycle = Stage 4 = 20 - 40 minutes.
Lightens to Stage 2 = 10 - 15 minutes
There is then a brief period of REM  - Beta

The rest of the night each REM cycle is followed by at least 30 minutes of non-REM.

References

Scientific American Article: Train Your Brain by Ulrich Kraft, Feb. 1, 2006. Internet article:
www.sciam.com/articleid=000C075D-4357-13D9-810183414B7F00

Book: High Performance Mind by Anna Wise, 1997, ISBN: 0-87477-850-6

Book: Introduction to Quantitative EEG and Neurofeedback by James R. Evans and Andrew
Abarbanel, 1999, ISBN - 13:978-0-12-243790-8

Book: Symphony in the Brain by Jim Robbins, 2000. ISBN - 0-8021-3819-5

Text: Biofeedback (Third Edition) by Mark Schwartz and Frank Andrasik, 2003. ISBN-13: 978-1-
59385-233-7

Text: Neuroscience: Exploring the Brain (Second Edition) by Mark F. Bear, Barry W. Connors &
Michael A. Paradisco, 2001.  ISBN: 0-7817-3944-6

The Clinical Guide to Sound and Light by Thomas Budzynski, Ph.d. (e-book)
www.mindplacesupport.com (reference)

Accessing Alternity: Neruotechnology and Alternate States of Consciousness by Bruce Harrah-
Conforth, Ph.D. (e-book), http://www.mindplacesupport.com (reference).

Various emails from Robert Austin, creator of Mindplace and Mindplace Products.
http://www.mindplace.com

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