LATERALITY EFFECTS IN NORMAL SUBJECTS - EVIDENCE FOR INTERHEMISPHERICINTERACTIONS

In this review we describe three methods of research that have been us ed to study relationships between the cerebral hemispheres in normal h uman subjects. We briefly mention reaction-time studies, which have be en used to measure interhemispheric transmission time; more pertinent to laterality effects, however, are lateralized visual field studies, in which stimuli can be presented either unilaterally or to both visua l fields simultaneously, and dichotic listening studies, wherein diffe rent stimuli are presented to the two ears simultaneously. Recent exam ples from the literature of experiments employing these techniques are discussed as they pertain to an understanding of interhemispheric int eraction. Some suggestions are offered concerning appropriate procedur es for studying interhemispheric interactions in normal human subjects .