FUNCTIONS OF THE BRAIN. 53 



result in a dog of Luciani's, even from bilateral destruction 

 of both temporal lobes in their entirety. * 



In the monkey, Terrier and Yeo once found permanent 

 deafness to follow destruction of the upper temporal con- 

 volution (the one just below the fissure of Sylvius in Fig. 



Fig. 16.— Luciani's Hearing Region. 



6) on both sides. Brown and Schaefer found, on the con- 

 trary, that in several monkeys this operation failed to notice- 

 ably affect the hearing. In one animal, indeed, both entire 

 temporal lobes were destroyed. After a week or two of 

 depression of the mental faculties this beast recovered and 

 became one of the brightest monkeys possible, domineering 

 over all his mates, and admitted by all who saw him to 

 have all his senses, including hearing, 'perfectly acute.' f 

 Terrible recriminations have, as usual, ensued between the 

 investigators, Ferrier denying that Brown and Schaefer's 

 ablations were complete, X Schaefer that Ferrier's monkey 

 was really deaf.§ In this unsatisfactory condition the sub- 

 ject must be left, although there seems no reason to doubt 

 that Brown and Schaefer's observation is the more important 

 of the two. 



In man the temporal lobe is unquestionably the seat of 

 the hearing function, and the superior convolution adjacent 

 to the syhdan fissure is its most imj)ortant part. The phe- 

 nomena of aphasia show this. We studied motor aphasia a 

 few pages back ; we must now consider sensory aphasia. 



* Die Fnnctions-Ldcalization, etc., Dog X; see also p. 161. 

 t Philos. Traus., vol. 179, p. 312. 

 X Braiu, vol. xi. p. 10. 

 § Ibid. p. 147. 



