Method of Determining Whether a Test Subject is a Specific Individual

A method of determining whether a test subject is a specific individual comprising:

• a) recording a first electroencephalograph (EEG) over a first period of time from the specific individual;
• b) exposing the specific individual during the first period of time to a first series of sensory stimuli comprising at least one sensory stimulus familiar to the specific individual and at least four sensory stimuli not familiar to the specific individual, wherein all the sensory stimuli are of the same modality, and quantitating the amplitude of a P300 waveform evoked by the at least one sensory familiar stimulus in the first EEG;
• c) recording a second EEG over a second period of time from the test subject;
• d) exposing the test subject during the second period of time to a second series of sensory stimuli comprising the at least one sensory stimulus familiar to the specific individual and to at least four sensory stimuli not familiar to the specific individual, wherein all the sensory stimuli are of the same modality;
• g) determining from the EEG whether the sensory stimulus familiar to the specific individual evokes a P300 waveform in the test subject and quantitating the amplitude of the P300 waveform so evoked in the second EEG;
• and
• h) comparing the amplitude of the P300 waveform quantitated in step e) with the amplitude of the P300 waveform quantitated in step b),
• wherein a P300 waveform quantitated in step e) of greater amplitude than the amplitude of the P300 waveform quantitated in step b) indicates that the test subject is the specific individual, and wherein the failure of the sensory stimulus familiar to the specific individual to evoke a P300 waveform or a P300 waveform quantitated in step e) of the same or lower amplitude than the amplitude of the P300 waveform quantitated in step b) indicates that the test subject is not the specific individual.