. Brains of rats and men; a survey of the origin and biological significance of the cerebral cortex. Cerebral cortex; Rats -- Behavior; Psychology, Comparative; Brain -- physiology; Psychology, Comparative; Cerebral Cortex. MECHANISMS OF LEARNING 179 The experiments clearly reveal a very peculiar re- lation of the cerebral cortex to this habit. After de- struction of the visual areas of both cerebral hemi- spheres, rats can learn this habit as readily as do nor- mal animals; but if rats which had acquired the habit with the cerebral cortex uninjured were then deprived of the posterior thirds o
. Brains of rats and men; a survey of the origin and biological significance of the cerebral cortex. Cerebral cortex; Rats -- Behavior; Psychology, Comparative; Brain -- physiology; Psychology, Comparative; Cerebral Cortex. MECHANISMS OF LEARNING 179 The experiments clearly reveal a very peculiar re- lation of the cerebral cortex to this habit. After de- struction of the visual areas of both cerebral hemi- spheres, rats can learn this habit as readily as do nor- mal animals; but if rats which had acquired the habit with the cerebral cortex uninjured were then deprived of the posterior thirds of both hemispheres, then the. Fig. 41.—The total extent of all of the lesions in rats that lost the habit of visual discrimination after operation (stipple). The solid black area was common to all. After Lashley. habit was totally lost. Upon resumption of training after the operation the habit was reacquired in about the same number of trials as were requisite in the ini- tial training. Figure 41 illustrates in stipple the total area involved in all of these operations and in solid black the area common to all of them. The latter field coincides approximately with the visual projection area as defined anatomically (area w of Fig. 38, p. 158), Clearly this area is related with the perform- ance of the habit, but it is not necessary for its acqui- sition. More than a hundred and fifty animals were trained in this habit, and the effects of various opera-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Herrick, C. Judson (Charles Judson), 1868-1960. Chicago, Ill. , The University of Chicago press
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