The Cerebrum. 423 



rather in favor of the view, that the gyrus fornicatus and 

 the hippocampal region and possibly the postero-parietal 

 convolution are especially concerned with the representa- 

 tion of sensation. 



Visual localisation. It is possible that portions of the 

 retina, possibly quadrants, are related to special centres 

 in the brain, but, in general terms, it may be said that the 

 angular gyrus and the occipital lobe preside over vision. 

 Ferrier states that the centre for the macula Jutea is situ- 

 ated in the angular gyrus, while Hensechen believes, that 

 the neighborhood of the calcarine fissure has intimate rela- 

 tions with the macula lutea. The centre for word vision 

 is situated in the inferior parietal convolution and espe- 

 cially in the neighborhood of the angular gyrus. Whether 

 word blindness is located here or immediately beneath, in 

 the subjacent white tissue, it is impossible to say, since 

 there lies beneath the angular gyrus an association tract 

 connecting the memory picture of words seen, with that of 

 words heard, hence a lesion of the angular gyrus could 

 interrupt this tract. A tumor, therefore, situated at the 

 angular gyrus may cause a loss of power of understand- 

 ing printed words or of reading aloud. 



Auditory localisation. The portion of the cerebrum 

 presiding over hearing is the superior and middle tem- 

 poral convolutions. Mills quotes an interesting case in 

 which a patient was able to hear sounds such as music, a 

 knock at the door, etc., but she could not understand 

 spoken words, and at the post mortem he found a lesion 

 involving the hinder ends of these convolutions, hence he 

 deduces that the centre for word hearing is situated at the 

 posterior thirds of the superior and middle temporal con- 

 volutions. The naming centre or the idea centre, for the 

 grouping of the evidences presented by the different 

 senses and the arrangement of them into ideas, is situated, 



