. Quarterly journal of experimental physiology and cognate medical sciences. t toes accompanied willed movements of theleft leg. Movements of right shoulder were poor and weak. On scratchingthe sole of the right foot the digits were extended and spread, but scratch-ing similarly the left sole induced no movement. Tickling the right sideof the face with a straw evoked lively action of the face ; similar ticklingof the left side of face evoked no facial action. The pupils were equal; no disturbance of eyeball movements wasdetected, though frequently looked for. July 29 (fig. 26).—Animal climbs a
. Quarterly journal of experimental physiology and cognate medical sciences. t toes accompanied willed movements of theleft leg. Movements of right shoulder were poor and weak. On scratchingthe sole of the right foot the digits were extended and spread, but scratch-ing similarly the left sole induced no movement. Tickling the right sideof the face with a straw evoked lively action of the face ; similar ticklingof the left side of face evoked no facial action. The pupils were equal; no disturbance of eyeball movements wasdetected, though frequently looked for. July 29 (fig. 26).—Animal climbs about cage a little, but practicallymakes no use of right arm, though some use of right leg, holding bars ofcage fairly well with right foot: is not feeding well. July 30.—Refuses food. Right hemisphere exposed under deep narcosis,and then explored by faradisation and mapped. Results resemble those 204 Leyton and Sherrington previously noted for right hemisphere in all general features. Left hemi-sphere re-exposed; motor responses obtained at some points from posterior. Fig. 26. — Very young chimpanzee ; large lesion in gyrus centralis anterior of left hemisphere. strip of centralis anterior not excised ; no motor responses from centralisposterior anywhere, thus agreeing with previous examination. Animalkilled by chloroform. Ablation-Experiment 7. Removal of part of Inferior FrontalConvolution of Left Hemisphere (fig. 27). Troglodytes niger, No. xiv., young adolescent ^, strong, vociferous; subject to fits of anger and excitement, and then becomesvery noisy, uttering a considerable variety of sounds, scolding, greeting,petulant, etc. On April 9, after animal had been in laboratory for sevenweeks, the skull was trephined under deep anaesthesia, and the lowerregion of left hemisphere was exposed and stimulated by unipolar faradisa-tion. The post-centralis in the field laid bare, up to inferior genu, wasnowhere found excitable ; pi-ecentralis was excitable cont
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