f | A HE report of J. Laraboullet, describing the operation of James J_ Gardner, who accomplished a true experimental resection of the right cerebral hemisphere, 1933, appearing about the same time as the report of Dr. W. E. Dandy, whose similar feat startled the complacent world of psychological theorists, stimulates the contemplation of the meaning of extirpation operations to psychological theory. A review of reports of brain surgeons will reveal that the right cerebral hemisphere has been removed with no observable permanent defection in the higher mental processes. The right frontal lobe, except the pre-rolandic area, the left frontal lobe, except the pre-rolandic and Broca's area, have been removed with no apparent loss of function. In fact, both frontal lobes, except pre-rolandic and Broca's areas, have been resected with no permanent loss of function. The removal of the pre-rolandic area (motor centers) is accompanied by some loss of facial movements. The excision of the post-rolandic area (sensory centers) was accompanied by some loss of facial sensations, but the deep sensations remained. The resection of the right temporal lobe was accompanied by a homonymous hemianopia, but no demonstrable disturbance of speech or mind. A similar situation was reported with respect to the extirpation of the left temporal lobe with the addition that there was a temporary anomia and an incomplete homonymous hemianopia. The removal of the uncus causes disturbance of the taste and smell functions. The excision of the right occipital lobe and the left occipital lobe are accompanied by complete homonymous hemianopia. The right parietal lobe has demonstrated no known function, excluding a sensory function of the paricentral region, contributing to the higher forms of thought. The left parietal lobe apparently contains centers for sensory speech. Its removal is accompanied by apraxia. The entire length of the corpus callosum has been divided without demonstrable mental loss. Broca's area may be removed with a temporary motor disturbance to the depth of two centimeters. Removal of *
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