Cerebral Asymmetry and Behavioral Laterality
Maudsley’s quotation above reformulated an earlier pronouncement of Sir Isaac Newton in which the remarkable overall exterior symmetry of Homo sapiens was credited to the deity (Oppenheimer, 1977). Whereas the symmetrical design of the human body is apparent from the outside, with two each of eyes, nostrils, ears, and limbs, the interior is recognized as asymmetrically arranged, most obviously in the thorax and abdomen where the organs are single. Asymmetry of the cerebral hemispheres is less discernible, nonetheless the early anatomists knew that the two cerebra are not mirror images in their gross structure. The more subtle absences of cerebral symmetry are revealed only piecemeal as discoveries of anatomic, electrophysiologic, and chemical differences between the two sides of the brain allude to differences in function and cerebral asymmetries and behavioral lateralities alternate in yielding to the search for scientific truth.
KeywordsCorpus Callosum Left Hemisphere Cerebral Hemisphere Planum Temporale Functional Asymmetry
Unable to display preview. Download preview PDF.