REFLEX AND CONDITIONED ACTION 39 



simultaneously stimulated, a nervous impulse is 

 transmitted from each to its own primary cerebral 

 center and local reflexes may follow. Since these 

 primary centers are connected with one another 



flustatormccnter 



Fig. I. — Diagram of some of the connections of nerves of touch and 

 taste in the medulla oblongata of the catfish, Ameiurus, as seen in longi- 

 tudinal section. 



centrally by fiber tracts, the ensuing response will be 

 the result of the interaction of all of the excitations 

 (Herrick, 1924, chap. xvii). Figure i illustrates such 

 a system of connections in a fish brain. Food may be 

 felt through the V nerve and tasted through the VII 

 nerve. If it feels right and tastes right the two stimuli 



