Chap. XXX.] HIGHER CEREBRAL FUNCTIONS. 683 



of the Sylvian Fissure of the left Hemisphere will pro- 

 bably prove almost as instrumental in producing one or 

 other variety of Amnesia, as lesions of or about the third 

 left frontal are of inducing Aphasia. In Broadbent's caso 

 (p. 645) the lesion was found in this region, and in a 

 fairly typical unpublished example of Amnesia the writer 

 has also recently found a lesion in the same situation. 



The reason for looking to this region will, moreover, be 

 obvious if the reader will recollect that the posterior third 

 of the peduncular fibres (that is of the so-called ' internal 

 capsule ') spread out from beneath the posterior part of the 

 Thalamus ; and that, stretching backward and outwards 

 across the floor of the lateral ventricle from near the begin- 

 ning of the descending cornu, they distribute themselves in 

 the main to the Occipital and the Temporal Convolutions. 

 And if the conclusions of Ferrier in regard to the im- 

 portant relations of the * supra-marginal lobule ' and 

 the * angular gyrus ' with the Visual Centre, and of the 

 posterior part of the * upper temporal convolution ' with 

 the Auditory Centre should prove to be correct, there 

 would be these still more precise reasons for expecting 

 to find the lesions productive of Amnesia, with some 

 frequency, in or about the situation, indicated. Such a 

 * localization ' may, therefore, be provisionally entertained, 

 and no more promising means of ultimately ascertaining 

 with tolerable certainty the situation of the most impor- 

 tant parts of the Visual and Auditory Perceptive Centres 

 in man would seem to present themselves, than the careful 

 clinico-pathological study of typical Amnesic cases when- 

 ever the opportunities may occur. 



Another question of great interest now arises, and that is, 

 whether it will be found that lesions productive of Amnesia 

 are also in the main limited to the left Hemisphere. Some 

 eminent observers, such as Brown- Sequard and Hugh- 



