PSYC 3530 Chapter Notes -Lateralization Of Brain Function, Lateral Sulcus, Cerebral Circulation
11 Nov 2013
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Brains (and hemispheres) differ in size, gyral patterns, distribution of gray and white matter, cytoarchitectonics, vascular patterns, and neurochemistry, among other things. Sex and handedness influence the organization of the cerebral hemispheres and ultimately the effects of cerebral injury. Anatomical studies: hand preference is correlated with differential patterns of right left asymmetry in the parietal operculum, frontal cortex, occipital region, vascular patterns, and cerebral blood flow. The performance of nonfamilial left-handed patients with unilateral lesions is like that of right-handed patients on neuropsychological tests. Theories of hand preference: environmental theories. Behavioral-- men held shields in left hand to protect the heart, women held baby in the left hand to be near the heartbeat, leaving right hand open to perform skilled tasks. Environmental accident-- left-handedness develops through a cerebral deficit caused by accident: anatomical theories. The first theory attributes right-handedness to enhanced maturation and ultimately greater development of the left hemisphere.
