Transient Evoked Potential in a Critical Event Detection Task.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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An experiment was designed to investigate late positive components of the transient evoked potential elicited by detection of a perceptually complex critical event. Areas of investigation included spatial distribution, motor response effects, stimulus duration effects, possible contingent negative variation effects, components of the event which immediately preceded the critical event, and value as a workload metric. Subjects watched a series of visual stimuli presented on a video screen. Each stimulus was a pattern of seven binary digits in a single row. Periodically, the number of consecutive 1s in the pattern built up to four. Four consecutive ones indicated a critical event. Subjects were instructed to depress a button when they detected a critical event. Electrodes recorded EEG at the parietal, central, and frontal midline scalp locations with opposing mastoids used for reference and ground. Reaction times and response accuracy were alos recorded.
- Medicine and Medical Research