Multiple afferent sensory stimulation device

A multiple afferent sensory stimulation device is provided to receive a prerecorded tape program upon which the audio stimulation and control signals for the visual stimulation of a subject person's eyes and ears is provided, the invention consisting of a reproducing device to emit the audio and visual control signals on separate left and right channels, the audio stimulation proceeding directly to earphones worn by the subject person, and the visual stimulation control signals processed electronically. The electronic processing includes devices to frequency separate the audio stimulus signals from the control signals, an automatic gain control circuit to assure sufficient amplitude of visual control signals for processing, tone decoders to separate signals energizing the visual stimulus and turning off the visual stimulus, logic circuit to assure certainty of the on and off stimulus control signals, the electrical stimulus provided by an electrical lamp immediately in front of the subject person's eyes. Various different schemes of audio and visual sensory stimulation are suggested for achieving a mental and physical affect upon the subject person.

BACKGROUND OF THE INVENTION 
1. Field of the Invention. 
The field of the invention is devices which simultaneously provide visual 
and audio stimulus to a person wearing a set of earphones and goggles with 
light stimulus in the front of the goggles. 
2. Description of Related Art. 
Researchers have discovered that through the use of visual and audio 
stimulus, certain reactions may be induced into a person such as 
relaxation, altered states of consciousness, and increase of the brain's 
functional intelligence. Such an application of stimuli to a subject 
person and the reaction obtained is termed "multiple afferet sensory 
stimulation" or MASS. 
These effects are produced through different combinations of visual and 
audio stimulus at different frequencies and in different rhythms. A total 
of four separate stimuli are available for energizing, one for each eye 
and for each ear, and such energizing may take many varied forms. The 
visual stimulus, if considering only one single color entity, such as an 
incondescent lamp, may have its brightness continually increased or 
decreased, may take the form of pulsed brief flashes of light which in 
turn can vary in brightness, or patterns over time or brillance can be 
formed with the pulses of light. For example, the pulses could be evenly 
spaced and of the same time width, and be increasing or decreasing in 
brightness, or the pulse repetition rate may be varied with or without the 
time period that the light is on or off fixed or varied. Further, the 
visual stimulus for each eye need not be the same. 
The mode of operation of the audio stimulus can have many of the 
characteristics of the visual stimulus, such as pulsed tone, although, and 
perhaps preferably, music or pink noise may be substituted for a tone or 
combination of tones. The volume of the audio sounds can be increasing or 
decreasing, can consist of chopped sounds which again may be increasing or 
decreasing in intensity, and the duty cycle may be changed, i.e., the 
portion of the time that a sound is present compared to one complete cycle 
of sound present and not present. 
Again, each sound stimulus for each ear need not be the same either. 
Machines varying the visual and audio stimulus discussed above have been 
developed in the prior art. 
It is reported that the human brain has basic frequencies at which it 
operates and which have been observed by recording equipment such as an 
electroencephalograph (EEG). These so called "brain waves" generally fall 
into four classifications in accordance with their frequency rate, namely 
Beta, Alpha, Theta, and Delta. Beta waves occur during a person's awake 
time and occupies a frequency spectrum of between approximately 12 and 30 
Hz. (cycles per second). Generally, the higher the frequency the more 
intense mental activity. Alpha waves occur during relaxation and during 
that twilight state just before sleep. Alpha waves occupy the frequency 
spectrum of approximately 8 to 12 Hz. Theta waves represents the frequency 
spectrum between 4 and 8 Hz and generally reflect brain activity during 
sleep or deep meditation. Lastly, Delta waves occur during times of 
deepest sleep and are generally in the range of 1 to 4 Hz. 
It has been determined by researchers, such as a Dr. George Corges, that a 
person's brain can be persuaded to operate in any of these four frequency 
spectrums by the application of visual and audio stimuli supplied in a 
desired frequency spectrum. The person's brain activity is "synchronized" 
with the frequency rate of the applied stimulus for certain defined 
stimulus. 
By slaving the visual stimulus, such as repetitive blinking lights, with 
the audio stimulus, such as repetitive tones, a person will soon find 
their brain wave frequency, and thus mental activity, synchronizing to the 
applied visual or audio stimulus. 
Obviously, various alternating modes of applied stimulus are possible by 
alternating between the left and right side eyes and ears in one or more 
of the sixteen possible combinations from no stimulus present on all four 
receptors (left and right eyes, left and right ears) to stimulus that all 
four receptors. In addition, the pattern of the stimulus can be varied as 
eluded to above. 
Of course, some combinations of stimulus will result in less reaction of 
the person while other combinations of stimulus will result in a profound 
reaction. 
Further, while it would be apparent that a scheme of application of 
structured visual and audio stimulus to a person would produce the best or 
desired reaction, yet it is possible to achieve desirable reactions by 
utilizing as the audio stimulus what is commonly termed "pink noise", 
which is a variation of "white noise". White noise is random electrical 
noise that exists in electronic circuits due to electron shot and thermal 
noise defined as having constant energy per unit band waves and 
independent of any central frequency of a band. The name is taken from the 
analogous definition of white light, which is the combination of lights of 
all colors in the light spectrum. Pink noise is white noise having the 
special characteristics that its intensity is inversely proportional to 
its frequency over a specified range. In pink noise, equal power is 
dissipated into a constant resistance in any octave band width in that 
range. Pink noise when heard, can have a very soothing effect, much like 
the sounds of ocean surf. 
All of the stimulus, both visual and audio, with its variations, can be 
pre-programmed upon magnetic tape and then, through properly designed 
equipment, be presented to a person to achieve the desired mental and 
physical effects. 
Accordingly, it would be useful to have a device adapted to take 
information pre-recorded on such a medium as magnetic tape, to decipher it 
through electronic circuits, and deliver the resultant electronic signals 
to generators of visual and audio stimulation surrounding a subject 
person. 
SUMMARY OF THE INVENTION 
The invention relates to a multiple afferent sensory stimulation device 
receiving on a prerecorded tape, a series of electronic signals which, 
after processing, control the placement of visual or sound stimulus before 
a subject person's eyes and ears. 
The prerecorded tape, in the preferred embodiment, will have two channels 
upon each of which will be recorded the audio signals such as pink noise 
or music, which is to be heard by one of the subject persons's ears (left 
or right), while, upon the same channel is also recorded, the control 
signals regulating the visual stimulus for the same side eye, (left or 
right). Nominally, the visual control signal is of a higher frequency than 
the audio signal for one or more reasons, primarily however, in order that 
the subject person listening should not have the audio portion interrupted 
by a audible visual control signal. Secondly, simple filter means may be 
used to separate the audio signal from the visual stimulation signal. 
Nominally, two channels on the prerecorded tape are provided to the 
invention, one for the right side of the person's head (right eye and 
hear) and one for the left side of a person's head (left eye and ear). 
Obviously a four channel tape could be utilized, one channel for each 
receptor of the subject person. 
The prerecorded tape is played back in the initial element of the 
invention, a playback device of some sort, such as a magnetic tape 
playback recorder, which output is divided into a left and right channel 
where each channel is to be separately processed by following electronic 
equipment. Since the processing circuitry which is the described invention 
and is the same for each channel, only one channel will be discussed. 
The audio information and visual control electrical signals exit from the 
reproduction device upon an electrical line which bifurcates, one line 
going directly to an earphone which is the means which allows the person 
to hear the audio portion of the stimulus The signal also proceeds to a 
buffer amplifier where it is amplified for further processing. The signal 
at this point contains both the audio signal add the encoded visual 
stimulation control signal. Following the buffer amplifier, the two 
signals are separated by passing them through a high pass filter which 
rejects the lower audio portion and passes the high frequency control 
signal. Thereafter, only the high frequency visual stimulation control 
signal is processed. 
Nominally, in the preferred embodiment, the audio range of signals which 
are recorded on the prerecorded tape and processed by the invention is in 
the range of 20 Hz to 20 kHz. and the high frequency visual stimulation 
control signals are in the range of 20 kHz. to 25 kHz. In the preferred 
embodiment, two visual stimulation control signals of 22.5 kHz. and 24 
kHz. were selected. The higher frequency is the visual stimulus turn on 
signal and the lower frequency the turn off signal. Each channel will have 
both signals present. 
To assure that a sufficiently large enough signal will be present for 
processing through logic circuits which are still ahead, it was found 
advantageous to follow the high pass filter with an automatic gain control 
circuit (AGC) which receives the high frequency signals and outputs the 
signals at a constant amplitude, regardless of their incoming amplitude. 
The signal is thereafter decoded by sending it to a pair of tone decoders, 
acting in parallel, one to search for signals having a specific frequency, 
say 24 kHz., and the other for the second specific frequency, nominally 
22.5 kHz. Each of the tone decoders then will pass the information 
received at each of those frequencies, the output of the tone decoders 
comprising a pulsed signal of a logic level (+5 vdc) or ground (0 vdc). In 
order to insure that all of the visual stimulation control signals are 
processed by the invention, it has been found helpful to compare the 
output of one tone decoder with the second in a logic circuit to assure 
faithful reproduction of the control signals. The control signals are such 
that only one of the two frequencies are present at all times. 
The output of the logic circuit is a series of logic level (0 or 1) pulses 
directed to the means by which visual stimulus is provided, namely a lamp 
driver, nominally a power amplifier, whose output is then used to pulse 
the visual stimulus, normally a lamp or perhaps a electronic shutter 
located between a source of light and a person's eyes. 
It is an object of the subject invention to provide a device for processing 
the signals from a prerecorded tape to provide multiple afferent sensory 
stimulation of the auditory and visual senses. 
It is another object to provide a multiple afferent sensory device which 
processes auditory and visual stimulus for separate audio and visual 
stimulus. 
It is another object of the subject invention to provide a multiple 
afferent device which receives encoded signals from a prerecorded tape and 
separates the signals so that the auditory and visual stimulation devices 
may be separately controlled. 
Other objects of the invention will in part be obvious and will in part 
appear hereinafter. The invention accordingly comprises the apparatus 
comprising the construction, combination of elements, and arrangement of 
parts which are exemplified in the following detailed disclosure, and the 
scope of the application which will be indicated.

In various views, like index numbers refer to like elements. 
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring firstly to FIG. 1, a block schematic diagram is shown of the 
invention which permits sensory stimulation of the visual and audio senses 
of a subject person, the stimulus in each of the patient's ears or eyes 
capable of being provided separately or together in all conceivable 
combinations. For example, one ear could be stimulated with sound without 
stimulating the other ear or visually stimulating either of the left or 
right eyes. The possible combination from no stimulus to any stimulus 
receptor (eyes or ears) to all four receptors receiving stimulus is 16 
possible combinations. 
Further, the combinations of stimulation is further increased because the 
light stimulation can be in combination of different brightnesses, or its 
brightness may be varied, either becoming more bright, or going less 
bright. Similarly, the audio stimulation can be at any volume, from very 
soft to very loud, or like the visual stimuli, may be increasing in volume 
or may be decreasing in volume. Further, both the audio and the visual 
stimulus can be pulsed in innumerable combinations. It is apparent that 
there is practically an unlimited number of combinations in which the four 
sensory organs may be stimulated. 
Such sensory stimulation is accomplished by the circuit shown in FIG. 1. 
Proceeding from left to right, at the far left is the playback device such 
as a magnetic tape playback recorder or other machine which emits 
electrical signals on two channels, a left channel and a right channel. 
Playback device 12 outputs the two channel electrical signals from its 
input which for example may be a pre-programmed audio cassette tape. The 
audio tape has been pre-programmed with the desired sounds, such as music 
or pink noise, which may be either played very softly, very loudly, 
increasing or decreasing in volume, or may appear in spaced apart 
pulsations. Superimposed upon the music or other sounds on the tape are 
the visual control signals which regulate and operate the visual stimuli. 
The electrical signals go immediately to the audio stimulation means, 
namely the appropriate left or right side of the headset worn by the 
subject person, the left earphone identified by the numeral 14 and the 
right earphone identified by the numeral 16. The other input to each 
earphone is grounded as shown in FIG. 1. The visual control signals are 
also present at the earphones, however, the earphone does not respond to 
electrical signals in their range (above 20 kHz.), or if the earphones do 
respond, the signals are above the subject person's hearing range. The 
left and right channels continue to buffer amplifiers 18 and 20 where the 
audio signals plus the visual stimulus control signals are amplified. At 
this point, discussion will continue along the left channel realizing of 
course that the very same discussion applies to the right channel since 
the circuit elements and components in each channel are identical. This 
does not, however, mean that the control signals on the left and the right 
channels are identical when the invention is being used, merely that the 
electronic hardware is. 
Since it is not desirable, or even necessary, that the patient hear the 
control signals for the visual stimulus, the visual control signals are 
encoded on to the tape or other recorded mechanism which programs the 
visual stimulus is at a frequency outside the hearing range of a person, a 
frequency above 20 kiloherz (kHz.). Also, the visual control signals are 
recorded at a low volume. 
To separate the encoded visual control signals from the audio portion, 
means such as high pass filters 22 and 24 are employed. These filters are 
designed to pass only frequencies greater than 20 kHz. In the preferred 
embodiment, two control frequencies utilized were 22.5 kHz. and 24 kHz. 
The higher of the two frequencies (24 kHz.) turns on the visual stimulus 
and the lower of the two frequencies (22.5 kHz.) turns off the visual 
stimulus. Only one frequency is present at a time. Following the high pass 
filters 22 and 24 is the electronic mechanism which assures that all the 
signals are of sufficient amplitude so that the later electronic 
processing equipment will receive all the information it is suppose to and 
therefore, automatic gain control (AGC) circuits 26 and 28 receive the 
electrical control signals from the high pass filters 22 and 24 
respectively. Since in the preferred embodiment, two signals are used to 
turn on and turn off the visual stimulus, which in the preferred 
embodiment is a lamp situated immediately in front of the subject person's 
eyes, the electrical control signals are passed from the AGC circuits 26 
and 28 to be decoded by a pair of tone decoders 30 and 32, and 34 and 36, 
left and right side. The tone decoders are essentially very narrow band 
pass filters which accept only a predetermined frequency signal and upon 
such receipt output a logic (1 or 0) level, for example, +5 vdc or 0 vdc, 
respectively. 
In the preferred embodiment, the band width then of the turn-on tone 
decoder 30 (and 34) has a center frequency of 24 kHz. and a band pass of 
not greater than 1 kHz. Thus, all signals in the range of 23.5 kHz. to 
24.5 kHz. will be received and acted upon by tone decoder 30. Similarly, 
tone decoder 32 (and tone decoder 36) is set to a center frequency of 22.5 
kHz. with a band width of not greater than 1 kHz. Accordingly, signals in 
the range of 22.0 kHz. to 23.0 kHz. are acted upon by tone decoder 32 (and 
tone decoder 36). The control signals are preferably in the form of sine 
waves at the appropriate frequency. 
Continuing with the block schematic diagram of FIG. 1, the signals process 
from the tone decoders 30 and 32 to logic circuit 38 (40 on the right 
channel) which receives both outputs for comparison to assure that in the 
event that there is some uncertainty in the decoder output signal, that by 
the comparison of the outputs of the tone decoders, the reliability of an 
output from the logic circuit is greater than the uncertainty of either 
one of the outputs of the tone decoder being correct. The tone decoders 
have been known to drop a signal, i.e., the output going to "0" for a 
short period of time when it should have remained a "1". Put in another 
way, logic circuit 38 assures that in the event one tone decoder errs, the 
other tone decoder assures that the logic circuit outputs the proper 
control signal. This assumes that both tone decoders do not err 
simultaneously. Logic circuit 38 is shown in FIG. 2 and discussed in 
connection with that Figure. From logic circuit 38, the visual stimulus 
control signal is directed to the means which provides the visual 
stimulus, namely lamp driver 42 (44 for the right channel) which is an 
amplifier that supplies current, and lamp 46 (48 on the right channel), 
which is energized by the electrical current. The other electrical 
connection to lamp 46 is the source of electrical energy, namely +12 volts 
dc. 
Since, as mentioned above, the visual stimuli presented can be either a 
very soft, dim light, or a very bright light, or a light increasing in 
brightness or a light decreasing in brightness, together with the light on 
or off with respect to real time, i.e., a series of light pulses over time 
in a coded group of light pulses, or as a continuous light, the visual 
stimulation obtained is an average of the actual number of pulses present 
to energize the light. Since the patient's eye will not respond to 
frequencies greater than 60 cycles per second or so, a series of closely 
spaced pulses having a repetition greater than 60 Hz, for example, would 
appear to the subject person as a light constantly on. Similarly, if the 
on pulses are initially widely separated and then become closer spaced and 
are at a repetition rate greater than 60 Hz, the light will appear to a 
subject person as increasing in brightness. Certainly the inverse is true, 
from pulses which are closely spaced to pulses which are spaced apart with 
respect to time will cause the light to appear to reduce its intensity 
over the period of time. If the light utilized is an incandescent bulb, it 
will take some period of time before it emits light from the time that the 
electrical pulse is received as the filament must heat up to the point of 
emitting the light. Plus, in the case of incandescent lights, the filament 
tends to stay hot and emit light for a period after the pulse has passed. 
Thus, the incandescent bulbs may be made to have its light energy waning, 
or increasing, or pulsing, when all it is, is the spacing of strings of 
electrical pulses. 
Obviously then, a pulse width modulation can be used as the procedure for 
producing the visual stimuli control pulses. 
In the preferred embodiment, the elements described in FIG. 1 comprise the 
following commercially available electronic circuits: amplifier 18 is a 
National Semiconductor LM741; the high pass filter 22 is a Gould 
Electronics programmable high pass filter S3529; the AGC circuit 26 is a 
circuit adapted from Applications of Operational Amplifiers, McGraw Hill, 
by Jerald g. Graeme, p. 218; and tone decoders 30 and 32 were National 
Semiconductors LM567 general purpose tone decoders designed to provide a 
saturated transistor switch to ground when an input signal is present 
within the pass band. The elements utilized in logic circuit 38, as will 
be further explained in connection with FIG. 2, were Motorola MC14069UB 
low power complementary MOS inverters, and lamp driver 42 was Siliconix 
VN2222L. 
Referring now to FIG. 2, a detailed block schematic diagram of logic 
circuit 38 (40 in the right channel) is detailed. The integrated circuits 
represented by triangle shapes are all logic inverters adapted to receive 
a signal and invert it to its opposite logic level. For example, "0" 
becomes a "1" and "1" becomes a "0". In the preferred embodiment, 0 volts 
dc was utilized as the "0" logic level and +5 volts dc is the logic level 
"1". The inputs, letters "A" and "B" are representative of the two outputs 
from the two tone decoders 30 and 32, and the output "C", the single 
output of logic circuit 38 shown in FIG. 1. 
Commencing firstly at input "A", whenever a "0" appears at the input, a "1" 
appears on the output of inverter 52. On input "B" for a 0 at the input to 
the first inverter 53 a 1 would appear at inverter 53's output, which in 
turn is the input for inverter 54 causing a "0" to appear on the output of 
inverter 54. Both of these logic levels, the outputs of inverters 52 and 
54, are conducted to the input of inverter 55, the output of which is 
conducted to the input of series inverter 56. Thus, for a "0" input to 
inverter 55, a 1 appears on its output, and thus on the input of inverter 
56 causing a 0 to appear on the output of inverter 56. The logic level 0 
at the output of inverter 56 is then conducted to the joinder point 
between the outputs of inverters 52 and 54 and, in this case, all being 
0's will place a 0 on the input to the final inverter 57 resulting in a 
"1" logic output from this final inverter. 
Thus, it is apparent that from the beginning through the end of the logic 
circuit 38, a "1" on the input of A resulted in a "1" on the output C. In 
the event that the input "B" were changed to a 1 resulting in both 1's on 
inputs A and B which should not be the case since only one frequency (22.5 
or 24 kHz.) is present at a time and the outputs of the tone decoders 
should not be the same, two "1's " would be an error), a 0 would appear on 
the output of inverter 52 and a 1 on the output of inverter 54. These two 
outputs are summed for the input of inverter 55 and would result in a 1 on 
the input of inverter 55 and a 1 on the output of inverter 56 except for 
the presence of feedback capacitor "D" which tends to average the input of 
inverter 55. If the 1 on inverter 53 input were short lived, the input to 
inverter 55 would remain 0 and the output "C" not be changed. 
For the opposite case, i.e., A is 0 and B is 1, the output of C is 0. This 
represents the situation of when the off frequency (22.5 kHz.) is present. 
Thus it is apparent that the output C will be 1 for inputs of A being 1 and 
B being 0; output C being 0 for A being 0 and B being 1. The output C does 
not change due to spurious outputs from the tone decoders. 
In the logic circuit 38 shown in FIG. 2, all the resistor "R" values are 
typically in the order of 10 k ohms. The sole capacitor "D" is 0.047 uF. 
The inverters were all part of a single integrated circuit, namely 
Motorola MC14069UB, a low power complimentary MOS hex inverter. 
The purpose of the logic circuit shown in FIG. 2 is more fully explained 
when the signals shown in FIG. 3 are discussed. Because there is a 
likelihood that there may be uncertainty in the output signals from the 
tone decoder, the circuit of FIG. 2 increases the certainty of an 
appropriate output. 
Referring now to FIG. 3, inputs A and B together with the resultant output 
C (refer to FIG. 2) are shown in what might be an output of tone decoders 
30 and 32. The output A (output of tone decoder 30) is 0 when starting 
and then rises to a logic level 1 for a period of time and then falls back 
to 0 for a second period of time and then rises to a 1 again. Input B 
(output of tone decoder 32) is the inverse of A and commences at a level 1 
falling to a level 0 at the time that the input A rises to a level 1. This 
continues for the same initial time period as above discussed, input B 
rising to a 1 at the same time that input A falls to 0. This then 
continues over the second period of time with 10 input B then falling to 0 
from 1 and input A rising from 0 to 1. As is evident in the illustration 
of inputs A and B, A and B both have uncertainties in the signals when the 
signals are a logic 1. Here, for example, input A, during the period of 
time that it is primarily in logic 1, has very short instances of time 
when it falls to 0 as illustrated by the up and downward going lines 
within its pulse width. The same situation applies to input B. To assure 
that the output C does have greater certainty than the inputs A and B, the 
circuit illustrated in FIG. 2 is utilized and as can be seen by the 
representative output C of FIG. 3, the resulting output wave form is a 
solid logic pulse over the period of time it is suppose to be solid and a 
clean output pulse C is generated. 
FIG. 4 is a perspective view of a patient utilizing the apparatus of the 
invention showing firstly the left and right earphones, 14 and 16 
respectively, of headset 60 mounted upon the head of the user 50. The 
headset is preferably spring loaded in the band connected to the two 
earphones so as to hold each earphone to the ear, each earphone utilizing 
a elastic cushion 13 and 15 situated between the earphone and the ear so 
as to provide comfort to the user and to keep out extraneous sounds from 
interfering with the programmed audio sounds heard by user 50. Situated 
proximate each of the user's eyes are a pair of goggles 62 which contain 
individual opaque lens, left opaque lens 64 and right opaque lens 66, each 
separated from the other and light protected. Immediately behind each of 
lens 64 and 66 are lamps 46 and 48 (FIG. 5), being the left and right lamp 
respectively. Thus, the subject person 50 shown in the diagram of FIG. 4 
has four inputs of audio or visual stimulus, each separated from the other 
and each capable of being separately energized with an appropriate sound 
or light stimulus. 
FIG. 5 is a top cutaway view of the opaque lens showing the lamp interposed 
between the lens and the subject person's eyes. In FIG. 5, lens 64 and 66 
are shown in goggles 62, goggles 62 so arranged with surrounding padding 
so as to prevent light passing from the outside into the interior portion 
where the subject person's eyes 49 and 51 are shown. Lamps 46 and 48 are 
shown mounted generally in front of the eyes upon a mount 45 and 47 which 
are attached to the respective left and right lens. 
An alternate embodiment of the visual stimulus is shown in FIG. 6 where, 
instead of a single lamp in front of each eye, three lamps have been 
placed before each eye, each lamp capable of emitting a different color, 
perhaps by coating the glass envelope of the lamp. The lamps are 
enumerated 46a, 46b, and 46c, for the left lamp and 48a, 48b, and 48c, for 
the right lamp. It is suggested that the primary colors of red, green, and 
blue be utilized as the three lights emitted from the lamps. The lamps are 
mounted to the left and right opaque lenses by means of lamp mounts 45a 
and 47a which attach to both the lamps and to the opaque lenses. Shown in 
FIG. 6, like FIG. 5, are the eyes 49 and 51 of the subject person, and the 
goggles. Like FIG. 5, FIG. 6 is a cutaway top view showing the user, the 
lamps, and the lenses. 
It is realized of course that if a system such as shown in FIG. 6 is 
utilized, the basic circuit shown in FIG. 1 would have to be modified in 
ways which are obvious to one skilled in the art. Simply, each left and 
right side channel of the circuit shown in FIG. 1 could be trebled in part 
so that each of the primary color lamps passes through its own circuit 
from tone decoders 30 and 32 through lamp driver 42. In such case, each of 
adjustable tone decoders would necessarily be set to decode one of the six 
required specific frequencies, each output of reproducing device 12 being 
such that the six total signal frequencies are present along with the 
audio portion. 
Next, a third embodiment of the invention is shown in FIG. 7 where the 
lamps have been placed outside the normally opaque lenses and the opaque 
lenses have been replaced with electrically operable light LCD filters or 
shutters. For example, referring to FIG. 7, the electrically operable 
light filters or shutters are shown as numerals 63 and 65 situated between 
the eyes 49 and 51 of subject person 50 respectively and the source of 
light, namely lamps 46a and 48a. In this case, the electrical signals from 
the lamp driver 42 and 44 respectively of FIG. 1 drives and varies the 
light filtering of the LCD filters or operation of the shutters 63 and 65 
and lamps 46a and 48a are continually emitting light, the light seen by 
the person then being controlled by the filters or shutters. Providing a 
support for the lamps 46a and 48a are covers 58 and 59, preferably opaque 
covers so that any third party watching the user will not necessarily be 
distracted by lights in front of the user's eyes. 
Further, in FIG. 7, it would be possible to remove the lamps 46a and 48a, 
replace the covers 58 and 59 with light diffusers such as sheet mylar, and 
then use the sun as a source of light. In such case, the shutters 63 and 
65 control the passage of light into the person's eyes. 
One last embodiment is shown in FIG. 8 wherein the lamps 46 and 48 of FIG. 
5 have been replaced by Bonar Kard-0-Lite electro eluminesent devices 
which are capacitors but act as light sources when pulsed, namely numerals 
46d and 48d. 
It is patently obvious that the medium used to store the programmed audio 
and visual stimulus control signals may take on prerecorded form, such as 
magnetic tape, punched tape, or laser encoded disk. In such case, the 
reproducing device 12 need only be the appropriate playback device. 
While a preferred embodiment and three alternate embodiments have been 
shown and described, it will be understood that there is no intent to 
limit the invention by such disclosure, but rather it is intended to cover 
all modifications and alternate constructions falling within the spirit 
and the scope of the invention as defined in the appended claims.