. The brain as an organ of mind. rrier.) Destruction of such parts on one side in an animal renderedinsensible by chloroform, seemed to produce blindnessof the opposite eye for a day or more—judging from theeffects of bandaging the other eye for a time and thenremoving the bandage, so as to be able to watch andcontrast the animals behaviour under these different con-ditions. After a day or two, the animal experimentedupon again appeared to see with both eyes. Where,however, these regions of the cortex had been destroyed inboth Hemispheres, the creature became blind in both 534 PHRENOLOGY: OLD
. The brain as an organ of mind. rrier.) Destruction of such parts on one side in an animal renderedinsensible by chloroform, seemed to produce blindnessof the opposite eye for a day or more—judging from theeffects of bandaging the other eye for a time and thenremoving the bandage, so as to be able to watch andcontrast the animals behaviour under these different con-ditions. After a day or two, the animal experimentedupon again appeared to see with both eyes. Where,however, these regions of the cortex had been destroyed inboth Hemispheres, the creature became blind in both 534 PHRENOLOGY: OLD AND NEW eyes, and did not subsequently recover from this condi-tion. Instead of a temporary defect on the side opposedto the unilateral lesion, the animals sight was now per-manently lost on both sides.* After comparative observations upon the effects of uni-lateral and double destructive lesions, Ferrier localized the* perceptive centre for the sense of Hearing in the upperhalf of the superior temporal convolution (fig. 175).. Fig. 175. —Brain of Moukey, slaowing a shaded area corresponding with the so-called Auditory Centre in the Cortex of the right Cerebral Hemisphere. (Ferrier.) Here again destruction of this region in one Hemispherewas found to lead only to a very temporary deafness inthe ear of the opposite side of the body; whilst destruc-tion of the same region in both Hemispheres caused alasting and total deafness on both sides. Eeferring to * See p. 393 for the notification that in the brain of Prof. DeMorgan there was no appreciable difference in the appearance of the angular gyrus aud the supra-marginal lobule on the two sidesof the brain, although this celebrated mathematician had been blindon one side almost from birth. In the examination of the Brain ofa deaf and dumb woman, moreover, Broadbent (Jrnl. of Anat. andPhysiol., vol. iv. p. 218) neither records the existence of nor repre-sents any special atrophy in the sui3erior temporal convolutions. Chap. XXV.]
Size: 1825px × 1369px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, booksubjectbrain, booksubjectpsychologycomparative
