title: Visual evoked potentials associated with the verbal and non-verbal problem-solving processes.
abstract: VEPs to six repetitive checkerboard and letter or number stimuli (presented in two triplets) were measured. The task solution process was separated into the store, retention, solve and post-solve stages. Three stimuli in intratrial stimulus positions 1, 2 and 3 were identical and another three in positions 4, 5 and 6 were also identical. The subject's task was either naming the letter-number or matching the checkerboard stimuli in two triplets. For both stimuli, the occipital P270 was almost the same in amplitude as positions 1 and 4. During the memory retention (at position 2) the P270 enhanced for the letter-number stimulus, but not for the checkerboard. During the post-solve stage (at positions 5 and 6) the P270 enhanced for both stimuli. The occipital P270 enhancement seems to correlate with the decrease in the degree of significance of the task relevant stimuli.
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D008568:Memory / Q000502:physiology; D011340:Problem Solving / Q000502:physiology*; D013647:Task Performance and Analysis; D014705:Verbal Behavior / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*