Stimulation of Cerebral Centres 131 



cortex is followed by movements of the muscles 

 of the upper limbs ; and so on with other groups 

 of muscles. These cortical areas are known as 

 motor centres; like areas on being stimulated 

 induce similar action in every species of the 

 canine family. Stimulation of other areas of 

 a dog's cerebral cortex leads to movements 

 which, there seems reason to think, depend on 

 work performed by the cortical nervous matter 

 governing the animal's feelings or sensations; 

 but as it is impossible to arrive at any accurate 

 conclusions regarding a dog's feelings, it is well 

 to defer this subject until we come to consider 

 the functions performed by certain areas of the 

 neopallium of human beings. There are con- 

 siderable spaces of the cerebral cortex in a 

 dog's brain situated between its motor and sen- 

 sory centres, which make no response to any 

 form of stimuli applied to them. These regions 

 of the cortex furnish lines of communication 

 between the various cortical and other nervous 

 centres, and transmute the energy it receives 

 into a form which so acts on motor centres as 

 to impart an intellectual character to the 

 animal's movements. These so-called associa- 



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