5C0 CEREBRAL MENTAL SUBSTRATA. 



therefore, of Thought, and that the several centres must 

 have the same kind of relation to Emotion, we may find 

 therein additional reason for the belief that the different 

 Perceptive Centres are diffuse in seat, and that widely 

 separated parts of the Cerebral Hemispheres are probably 

 knitted together for simultaneous action even in the 

 simplest sensory Perception — containing, as this process 

 does, the germs of Thought and Emotion, to say nothing 

 of ' Volition '.* And although these diffuse, but func- 

 tionally unified, nervous networks may differ much from 

 ordinary ' Centres ' (owing to their assumed lack of topo- 

 graphical distinctness and exclusiveness), it is still con- 

 venient to be able to refer to such networks as * Centres.' 



But in addition to the complex perceptive mechanisms 

 in relation with the 'five senses,' there are also other Cere- 

 bral Centres for ingoing impressions, some of which are, 

 when in action, habitually attended by more or less of 

 Consciousness, whilst others are as constantly devoid of 

 any such accompaniment. Yet all these ' Centres ' — quite 

 irrespective of the degree of vividness of the subjective 

 accompaniments dependent upon their activity — are pro- 

 bably situated in some portions of the Cerebral Cortex. ■)■ 



* See Dr. Lombard, "On the effect of Intellectual and Emo- 

 tional Activity on the Temperature of the Head," in " Proceed, of 

 Royal Society," 1878, p. 462. 



f Among these a ' sense of Space ' Centre ought, perhaps, to be 

 include*.!, the activity of which would, however, be of less import- 

 ance for Man than for many of the lower animals (pp. 214-219). 

 The instinctive and untaught migrations of young Birds may depend 

 much upon the automatic activity of this Centre, and are pb.enoniena 

 of the same order as the instinctive fear of the young Turkey on 

 hearing the cry of the Hawk (p. 189), or the instinctive apprecia- 

 tion of food and distance which enables the young Chick to snap at 

 and capture a Bee (p. 188). In all these cases we have to do with 

 automatic Perceptions, as well as with Automatic Movements. 



