Measurement of EEG reactivity

An apparatus for assessing physiological signal reactivity of a subject, the apparatus comprising:

• reception means for receiving physiological signal data obtained from a subject;
• means for applying a time reference corresponding to a stimulus;
• alignment means for temporally aligning the physiological signal data with the time reference;
• first calculation means for deriving a first set of values for a first measure indicative of irregularity in the physiological signal data, the first set including at least one value of the first measure;
• second calculation means for producing a second set of values for the first measure, the second set being subsequent to the first set and including at least one value of the first measure;
• and
• third calculation means for determining, based on the first set and the second set, whether reactivity is present in the physiological signal data,
• wherein the first and second sets have defined positions with respect to the time reference in time domain.

An apparatus for assessing physiological signal reactivity of a subject, the apparatus comprising:

• a memory unit configured to receive physiological signal data obtained from a subject;
• a first controller configured to detect a time reference corresponding to a stimulus and to align the physiological signal data temporally with the time reference;
• a second controller configured to derive a first set of values for a first measure indicative of irregularity in the physiological signal data, the first set including at least one value of the first measure;
• a third controller configured to produce a second set of values for the first measure, the second set being subsequent to the first set and including at least one value of the first measure after the time instant;
• and
• a fourth controller configured to determine, based on the first set and the second set, whether reactivity is present in the physiological signal data,
• wherein the first and second sets have defined positions with respect to the time reference in time domain.

A computer program product for assessing physiological signal reactivity of a subject, the computer program product comprising:

• a first program code portion configured to apply a time reference corresponding to a stimulus and to align physiological signal data obtained from a subject with the time reference;
• and
• a second program code portion configured to derive a first set of values for a first measure indicative of irregularity in the physiological signal data, the first set including at least one value of the first measure;
• a third program code portion configured to produce a second set of values for the first measure, the second set being subsequent to the first set and including at least one value of the first measure after the time instant;
• and
• a fourth program code portion configured to determine, based on the first and second sets, whether reactivity is present in the physiological signal data,
• wherein the first and second sets have defined positions with respect to the time reference in time domain.