Measurement of EEG reactivity
First Claim
1. A method for assessing physiological signal reactivity of a subject in a single-trial analysis, the method comprising:
- obtaining a single continuous physiological signal from the subject;
supplying a stimulus to the subject while the physiological signal is being obtained;
constructing, based only on a time series of the physiological signal obtained from the subject, a signal model for the physiological signal using a processor;
applying a single time reference to the time series corresponding to the time the stimulus is supplied;
obtaining further signal data from the time series of the physiological signal, the further signal data being obtained from the subject subsequent to the time reference;
testing whether the signal model is a valid signal model for the physiological signal, wherein the testing includes employing the signal model constructed from the physiological signal obtained at least partially prior to the single time reference and the further signal data obtained subsequent to the single time reference; and
indicating, based on the testing, whether reactivity is present in the physiological signal.
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Accused Products
Abstract
The invention relates to a method and apparatus for assessing the reactivity observable in a certain physiological signal, especially the EEG signal, of a comatose subject. In order to obtain an objective and a reliable measure of the reactivity automatically and without the presence of a trained EEG specialist, a valid signal model is constructed for an EEG signal obtained from the subject. A time reference corresponding to a stimulus is applied and further signal data is obtained from the time series, the further signal data being subsequent to the time reference. By employing the further signal data, the method tests whether the signal model remains to be a valid signal model for the EEG signal also after the stimulus, and indicates, based on the test, whether reactivity is present in the physiological signal.
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Citations
11 Claims
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1. A method for assessing physiological signal reactivity of a subject in a single-trial analysis, the method comprising:
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obtaining a single continuous physiological signal from the subject; supplying a stimulus to the subject while the physiological signal is being obtained; constructing, based only on a time series of the physiological signal obtained from the subject, a signal model for the physiological signal using a processor; applying a single time reference to the time series corresponding to the time the stimulus is supplied; obtaining further signal data from the time series of the physiological signal, the further signal data being obtained from the subject subsequent to the time reference; testing whether the signal model is a valid signal model for the physiological signal, wherein the testing includes employing the signal model constructed from the physiological signal obtained at least partially prior to the single time reference and the further signal data obtained subsequent to the single time reference; and indicating, based on the testing, whether reactivity is present in the physiological signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification