Intellectual Processes 149 



man's neopallium has probably resulted to a 

 considerable extent from the development of 

 his motor cerebral area of speech, and the power 

 he has thus gained of expressing his thoughts in 

 intelligent language. If, as in the case of the 

 idiot we have referred to, the motor area of the 

 brain regulating the action of the muscles of 

 articulation has not been developed, and the 

 cerebral hemispheres as a whole are imperfect, 

 the intellectual powers of such an individual 

 are of a low order, and he is unable to express 

 his thoughts in articulate language. The size 

 of the brain, however, is by no means the only 

 thing which determines the standard of an 

 individual's intellectual powers; its inherited 

 qualities, state of nourishment, and the training 

 its nervous substance has undergone in early 

 childhood are factors which influence the kind of 

 work it is able to perform. To appreciate this 

 fact at its true value we must endeavour to 

 understand the nature of the mechanism, the 

 orderly working of which is the essential 

 requisite for the occurrence of intellectual pro- 

 cesses. 1 



1 The Brain in Health and Disease, by Dr. J. Shaw Bolton, 

 pp. 51-123. 



