534 PHRENOLOGY : OLD AND NEW 



eyes, and did not subsequently recover from this condi- 

 tion. Instead of a temporary defect on the side opposed 

 to the unilateral lesion, the animal's 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 upper 

 half of the 'superior temporal convolution' (fig. 175). 



FIG. 175. Brain of Monkey, showing 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 Hemisphere 

 was found to lead only to a very temporary deafness in 

 the ear of the opposite side of the body ; whilst destruc- 

 tion of the same region in both Hemispheres caused a 

 lasting and total deafness on both sides. Referring to 



* See p. 393 for the notification that in the brain of Prof. De 

 Morgan there was no appreciable difference in the appearance of the 

 ' angular gjrus ' and the * supra-marginal lobule ' on the two sides 

 of the brain, although this celebrated mathematician had been blind 

 on one side almost from birth. In the examination of the Brain of 

 a deaf and dumb woman, moreover, Broadbent ("Jrnl. of Anat. and 

 Physiol.," vol. iv. p. 218) neither records the existence of nor repre- 

 sents any special atrophy in the ' superior temporal convolutions. 



