568 WILL AND 



by the same writer's notion as to the functions of the 

 Cerebellum in the j)roduction of such Movements. The 

 respective parts which he is inclined to assign to each of 

 these oroans will thus be seen. He says : — 



"The Gerehellum co-ordinates movements guided by vision, or 

 combines the general movements of the body rendered necessary by 

 sjJecial actions ordered by volition. For instance, to illustrate the 

 latter function, I wish to strike a blow. I am conscious only of 

 the desire to hit the object and hit it hard; this is the only action 

 realized in consciousness. But in order to carry out the intention, 

 not only must the fist be clenched and the arm shot out, but the 

 feet must be firmly planted, the legs made rigid, the body thrown 

 forward, the chest fixed; and this is what is done for me by the 



Cerebellum We can see that there is no such relation 



between visual impressions as between these and tactile imj)res- 

 sions, and any mechanism, such as that for reflex response to the 

 latter, is impossible as regards vision How the Cere- 

 bellum is acted upon by the Cerebrum or sensori-motor ganglia, 

 and in turn acts upon the cord, we do not yet know." 



The above notions entertained by Broadbent in regard 

 to the functions of the Cerebellum, are, in part, not very 

 different from what have been expressed in Chap. xxiv. 

 There are, indeed, good grounds for believing that the 

 Cerebellum acts in some way at the instigation of the 

 Cerebrum in the production of Voluntary Movements 

 (see p. 507) ; and in these cases, as already explained, the 

 movements are mostly guided by Vision. On the other 

 hand, it seems obvious that the Cerebellum also assists in 

 the performance of ' automatic ' Movements of the highest 

 or most general order, such as might well be conceived 

 to fall to the share of a great Motor Ganglion standing 

 at the head of, but in intimate relation with, all other 

 subordinate motor centres in the Medulla and Cord. 

 Being concerned as it is, therefore, both with new and 

 with old actions it has an essentially double function ; 



