PHILOSOPHICAL TRANSACTIONS. 
I. A Record of Experiments upon the Functions of the Cerebral Cortex. 
By Victor Horsley, M.B., F.R.C.S., F.R.S., Professor Superintendent of the Brotvn 
Institution, and Edward Albert Schafer, F.R.S., Jodrell Professor of Physio- 
logy in University College, London. {From the Physiological Laboratory, 
University College.) 
Received Februaiy 5, — Read February 17, 1887. 
[Plates 1-7.] 
Introductory Kemarks. 
The experiments which are here recorded are selected from a series which we have 
been engaged upon during the past three years, having for their object the further 
elucidation of the functions of the several parts of the cerebral cortex, with especial 
reference to localisation of the centres for voluntary action and sensation. They were 
undertaken by us in the hope of clearing up some of the discrepancies in the evidence 
offered upon these points by previous observers, and for this purpose it was important 
to go over ground which had already been trodden ; but we subsequently found 
it to be necessary to investigate portions of the cortex which, probably by reason 
of difficulty of access, had not, so far as we could ascertain, been touched by our 
predecessors in this field of physiological research, and particularly the convolutions 
upon the mesial aspect of the hemisphere, viz., the gyrus marginalis and the gyrus 
fornicatus. 
Methods. 
The methods we have employed have been : 1. Electrical Excitation, and 
2. Ablation. For the purposes of electrical excitation we have generaUy used 
a du Bois-Reymond inductorium, with a metallic reed interruptor in place of the 
MDCCCLXXXVm. — B. B 1.3.2.88 
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