Method for the quantification of human alertness
First Claim
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1. A method for locating eye-blinks in the electroencephalogram (EEG) without the use of concurrent electroocculogram (EOG) signals, comprising the steps of:
- acquiring EEG signals of a person from a plurality of EEG electrode sites for a plurality of sequential epochs;
determining a plurality of cross-correlation variables from the EEG signals;
extracting at least one output variable from said plurality of cross-correlation variables determined to be predictive in identifying eye-blinks in the EEG signals; and
locating the eye-blinks within corresponding epochs in the EEG signal based upon said at least one output variable.
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Abstract
The method for the quantification of EEG waveforms along the alertness continuum involves collecting and transforming EEG signal data, identifying and rejecting or decontaminating epochs containing various artifacts, and classifying individual EEG patterns along an alertness-drowsiness continuum. The results of the multi-level classification system are applied in real-time to provide feedback to the user via an audio or visual alarm, or are recorded for subsequent off-line analysis.
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13 Claims
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1. A method for locating eye-blinks in the electroencephalogram (EEG) without the use of concurrent electroocculogram (EOG) signals, comprising the steps of:
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acquiring EEG signals of a person from a plurality of EEG electrode sites for a plurality of sequential epochs;
determining a plurality of cross-correlation variables from the EEG signals;
extracting at least one output variable from said plurality of cross-correlation variables determined to be predictive in identifying eye-blinks in the EEG signals; and
locating the eye-blinks within corresponding epochs in the EEG signal based upon said at least one output variable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a system for identifying eye blinks in the electroencephalogram (EEG) which utilizes only the EEG signal for identification of the eye blinks, comprising the steps of:
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acquiring EEG and electroocculogram (EOG) signals of a person from a plurality of EEG and EOG electrode sites for a plurality of sequential epochs which contain eye-blinks;
determining a plurality of cross-correlation variables from the EEG signals and generating output variables based upon the plurality of cross-correlation variables;
utilizing an EOG channel to confirm the presence of an eye-blink in the EEG signals;
establishing thresholds for said output variables to identify the presence of eye-blinks in the EEG signals. - View Dependent Claims (10, 11, 12, 13)
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Specification