Adaptive interference canceler for EEG movement and eye artifacts
First Claim
1. An EEG (electroencephalograph) system comprising:
- (a) a plurality of EEG electrode means adapted to be removably connected to the scalp of a subject to detect the subject'"'"'s brain waves;
(b) amplification means connected to the EEG electrode means to amplify the detected brain waves and produce an amplified signal output for each EEG electrode means;
(c) a three-axis translation accelerometer adapted to be removably positioned on the head of the subject to detect the subject'"'"'s head movement, the accelerometer producing at least one signal output indicative of the head movements;
(d) an interference canceler connected to the outputs of the amplification means and the accelerometer signal output, the canceler comprising a filter having an output and an adder connected to the output of the filter and the amplification means, the adder producing corrected and usable EEG signals.
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Abstract
In an EEG (electroencephalogram) system to detect brain waves from a subject, the adverse effect on the EEG recording of artifact due to head, body and eye movements is reduced. A head and body movement reference signal can be provided by an accelerometer, motion detector or, alternatively, spatial average of EEG channels. Eye motion sensors are used as a reference for eye movement artifacts. A composite reference signal consists of the head, body and eye movement reference signals. The contaminated EEG is the primary input to the adaptive movement and eye artifact canceler, in which an adaptive filter estimates the contaminants in the measured EEG data, and then subtracts them from the primary signal to obtain the corrected EEG data.
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Citations
35 Claims
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1. An EEG (electroencephalograph) system comprising:
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(a) a plurality of EEG electrode means adapted to be removably connected to the scalp of a subject to detect the subject'"'"'s brain waves; (b) amplification means connected to the EEG electrode means to amplify the detected brain waves and produce an amplified signal output for each EEG electrode means; (c) a three-axis translation accelerometer adapted to be removably positioned on the head of the subject to detect the subject'"'"'s head movement, the accelerometer producing at least one signal output indicative of the head movements; (d) an interference canceler connected to the outputs of the amplification means and the accelerometer signal output, the canceler comprising a filter having an output and an adder connected to the output of the filter and the amplification means, the adder producing corrected and usable EEG signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An EEG (electroencephalograph) system comprising:
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(a) a plurality of EEG electrode means adapted to be removably connected to the scalp of a subject to detect the subject'"'"'s brain waves; (b) amplification means connected to the EEG electrode means to amplify the detected brain waves and produce an amplified signal output for each EEG electrode means; (c) signal averaging means to combine and average at least some of the amplified signal outputs to generate a spatial average EEG signal as a head and body reference signal; and (d) an interference canceler connected to the outputs of the amplification means and the signal averaging means, the canceler comprising a filter having an output, and an adder connected to the output of the filter and the amplification means, the adder producing corrected and usable EEG signals. - View Dependent Claims (10, 12, 13, 14, 15, 16, 17, 18, 19)
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11. An EEG system as in claim 11 wherein an accelerometer is positioned on the subject'"'"'s head and the accelerometer is a three-axis translational accelerometer.
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20. An EEG (electroencephalograph) method comprising the steps of:
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(a) connecting a plurality of EEG electrodes to the scalp of a subject to detect the subject'"'"'s brain waves; (b) amplifying the subject'"'"'s brain waves using amplification means connected to the EEG electrodes to produce an amplified signal output for each EEG electrode; (c) connecting a three-axis translation on the head of the subject to detect the subject'"'"'s head movements, the accelerator producing at least one reference signal output indicative of the head movements; (d) using an interference canceler to produce corrected EEG signals, the canceler being connected to the output of the amplification means and to the reference signal, the canceler comprising a filter having an input connected to the output of the reference signal and having an output, and an adder connected to the output of the filter and the amplification means, the adder producing corrected and usable EEG signals. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. An EEG (electroencephalograph) method comprising the steps of:
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(a) connecting a plurality of EEG electrodes to the scalp of a subject to detect the subject'"'"'s brain waves; (b) analyzing the subject'"'"'s brain waves using amplification means connected to the EEG electrodes to produce an amplified signal output for each EEG electrode; (c) combining and averaging at least some of the amplified signal outputs and thereby generating a spatial average EEG signal as a head and body reference signal; and (d) using an interference canceler to produce corrected EEG signals, the canceler being connected to the output of the amplification means and to the reference signal, the canceler comprising a filter having an input connected to the reference signal and having an output, and an adder connected to the output of the filter and the amplification means, the adder producing corrected and usable EEG signals. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification