title: Decision in ambiguity: hemispheric dominance or interaction?
abstract: Fifty-eight subjects were shown tachistoscopically grey rectangles, at the centre of the field of vision. The rectangles extended equally to the left and right of the visual fixation point, and were presented under four background conditions: all white, all black, white in the left half of the field and black in the right half, black in the left and white in the right half. "Chimerical" backgrounds were assumed to create an interhemispheric ambiguity in the perception of the greyness of the stimuli as a consequence of opposed brightness contrasts. The reported birghtness was therefore expected to reflect a hemispheric dominance or an interhemispheric averaging of information. The results of the experiment supported the second hypothesis.
mesh_terms: D004192:Discrimination, Psychological / Q000502:physiology; D004292:Dominance, Cerebral / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D014796:Visual Perception / Q000502:physiology*