628 



CEREBRAL CONVOLUTIONS. 



[BOOK in. 



FIG. 87. 



infra-marginal or superior [first] temporo-sphenoidal convolution). Pricking of the 

 opposite ear, the head and eyes turn to the opposite side, and the pupils dilate 

 largely. (Centre of hearing.) Ferrier moreover places the centres of taste and 

 smell at the extremity of the temporo-sphenoidal lobe, and that of touch in the 

 gyrus uncinatus and hippocampus major. 



its cerebral hemispheres, coordination is effected in parts of the 

 brain other than the surface of the cerebral hemispheres; and all 

 that the areas in question do is to make use in some way or other 

 of these lower coordinating mechanisms. 



As will be seen from an inspection of the figures the areas, 

 stimulation of which gives rise to definite movements, are dis- 

 tributed over a part only of the surface of the hemispheres. 

 Over large tracts of the surface electric stimulation gives rise to no 

 movements at all. It has been supposed that the stimulation 

 of these parts gives rise to various psychical states, of such a nature 

 that they do not manifest themselves by any movements as do the 

 psychical states brought about by stimulation of the so-called 

 motor areas; and hence these tracts have been supposed to be 



