A structural determinant of hemispheric processing of pictorial material

A qualitative difference of processing type by the two cerebral hemispheres was demonstrated in a picture arrangement task which involved a concept of temporal sequence. Half the sequences were designed to rely on analytic categorical processes and half on configurational processes. The subjects were patients with unilateral hemispheric damage of vascular etiology. Using two measures of performance, latency and errors, patients with right hemisphere damage were seen to be relatively impaired on those sequences designed to employ hypothesized right hemisphere (configurational) processing and patients with left hemisphere damage were seen to be relatively impaired on those sequences designed to employ hypothesized left hemisphere (categorical) processing.