Rapid automatic electroencephalographic evaluation
First Claim
1. A method in electroencephalography for testing subjects to determine organic brain dysfunction by diffuse or localized shifts in the EEG spectrum, the method comprising:
- removably securing a plurality of electrodes to the head of said subject under test, providing multiple channels of information with each channel being from a different head region;
amplifying the on-going signals representing brain waves from each of said head regions while the subject sits relaxed with a minimum of external stimuli;
converting the said amplified signals into digital form;
dividing the digital form brain wave signals into a plurality of frequency bands;
computing the power in each of said frequency bands for each head region to provide frequency band relative (%) power;
automatically comparing said relative power in each frequency band with a set of normative relative power data derived from a normal population using the formula;
space="preserve" listing-type="equation">a.sub.o +a.sub.1.sup.t +a.sub.2.sup.t.spsp.2 +a.sub.3.sup.t.spsp.3 +a.sub.4.sup.t.spsp.4 where t is age related and the coefficients Ao . . . a4 are determined by data from the normal population, where a different polynomial is used to define the relative power expected in each frequency band in each head region;
computing the Z-transform of each subject value relative to the means and standard deviations of the normative data; and
displaying the results for each subject of such computation for each of said different head regions at each of said frequency bands.
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Abstract
The rapid automatic examination and evaluation of large numbers of subjects by electroencephalography is accomplished by removably securing electrodes to the head of each subject under test to provide a plurality of channels of brain wave information corresponding to different head regions. The brain wave signals are amplified, converted into digital form, and the relative power in each of a plurality of frequency bands for each head region is automatically compared with a set of comparative relative power data derived from a normal population by computing a Z-transform. The results of that comparison are then displayed.
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Citations
11 Claims
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1. A method in electroencephalography for testing subjects to determine organic brain dysfunction by diffuse or localized shifts in the EEG spectrum, the method comprising:
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removably securing a plurality of electrodes to the head of said subject under test, providing multiple channels of information with each channel being from a different head region; amplifying the on-going signals representing brain waves from each of said head regions while the subject sits relaxed with a minimum of external stimuli; converting the said amplified signals into digital form; dividing the digital form brain wave signals into a plurality of frequency bands;
computing the power in each of said frequency bands for each head region to provide frequency band relative (%) power;
automatically comparing said relative power in each frequency band with a set of normative relative power data derived from a normal population using the formula;
space="preserve" listing-type="equation">a.sub.o +a.sub.1.sup.t +a.sub.2.sup.t.spsp.2 +a.sub.3.sup.t.spsp.3 +a.sub.4.sup.t.spsp.4where t is age related and the coefficients Ao . . . a4 are determined by data from the normal population, where a different polynomial is used to define the relative power expected in each frequency band in each head region; computing the Z-transform of each subject value relative to the means and standard deviations of the normative data; and displaying the results for each subject of such computation for each of said different head regions at each of said frequency bands. - View Dependent Claims (2, 3, 6)
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4. A method in electroencephalography for testing subjects to determine organic brain dysfunction by diffuse or local shifts in the EEG spectrum, the method comprising:
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removably securing a plurality of electrodes to the head of said subject under test, providing multiple channels of information with each channel being from a different head region; amplifying the on-going signals representing brain waves from each of said head regions while the subject sits relaxed with a minimum of external stimuli; converting the said amplifier signals into digital form; dividing the digital form brain wave signals into a plurality of frequency bands;
computing the power in each of said frequency bands to provide frequency band relative (%) power;
automatically comparing said relative power in each frequency band with a set of normative relative power data derived from a normal population and related in age to the subject;computing the Z-transform of each subject value relative to the means and standard deviations of the normative data; and displaying the results for each subject of such computation for each of said frequency bands according to the head locations tested. - View Dependent Claims (5)
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7. A system in electroencephalography for screening of subjects to determine organic brain dysfunction by diffuse or local shifts in the EEG spectrum, comprising:
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a plurality of electrodes removably secured to the head of said subject to detect the brain waves of the subject and connected to selected different regions of the subject'"'"'s head; means for simultaneously amplifying the brain wave signals from each of said electrodes; means for converting the amplified signals into digital form; means for dividing the digital form brain wave signals from each of said selected head regions into a plurality of frequency bands, computing the power in each of said bands at each of said head portions to provide regional frequency band relative (%) power;
automatically comparing said regional frequency-band relative power with a set of normative results from a normal population using the formula;
space="preserve" listing-type="equation">a.sub.o +a.sub.1.sup.t +a.sub.2.sup.t +a.sub.3.sup.t.spsp.3 +a.sub.4.sup.t.spsp.4where t is age related and the coefficients ao . . . a4 are determined by the data from the normal population; means for computing the Z-transform of each subject value relative to the means and standard deviations of the normative results; and means to display the results of the said Z-transform computation. - View Dependent Claims (8)
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9. A system in electroencephalography for screeing of subjects to determine organic brain dysfunction by diffuse or local shifts in the EEG spectrum, comprising:
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a plurality of electrodes removably secured to the head of said subject to detect the brain waves of the subject and connected to selected different regions of the subject'"'"'s head; means for simultaneously amplifying the brain wave signals from each of said electrodes; means for converting the amplified signals into digital form; means for dividing the digital form brain wave signals from each of said selected head regions into a plurality of frequency bands, computing the power in each of said bands at each of said head portions to provide regional frequency band relative (%) power;
computer memory means for storing age-related normative tables of relative (%) power for each of said frequency bands;
means for automatically comparing said regional frequency-band relative power with normative results from a normal population using said stored normative tables;means for computing the Z-transform of each subject value relative to the means and standard deviations of the normative results; and means to display the results of the said Z-transform computation. - View Dependent Claims (10, 11)
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Specification