Brain Potentials at the Eye Fixations to Abnormal and Normal Events in a Medical Device

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Brain potentials to abnormal stimuli in medical care. The eye fixation related brain potentials (EFRP) is a unique event related brain potential that is associated with offset of a saccadic eye movement; i.e. onset of an eye fixation. The potential is measurable at eye moving situations. The potential like ERP changes with attention. 13 subjects were asked to search visual stimuli consisting of pictures of three directional stopcocks in a display. The task was to detect irregular directions of the knob of stopcocks. EFRP was measured in the visual searching task to detect targets as irregular positions of a medical device. EEG (Oz, Pz and Cz) and EOG were measured. EEG epochs associated with offset of saccades were averaged to get EFRP. The positive components of 100 ms appeared predominantly at Oz to all stimuli. When the subject detected targets correctly positive components with latency of about 300 ms appeared at Oz, Pz and Cz.
2008-10-11