440 BRAIN MECHANISMS AND LEARNING 



on the associative cortex. In Fig. lo this type of response can be seen in 

 superimposed sweeps. 



On the other hand, after local destruction of the reticular formation, no 



Fig. 9 

 Disappearance of the cortical evoked potential by pre- 

 vious reticular stimulation at I GO msec, interval and 

 8 volts. 



Fig. 10 

 Same as Fig. y but stimulation at 50 msec, interval 

 and 8 volts. 



evoked potential was obtained by its stimulation and oi course the cortical 

 evoked potential after tactile stimulus was not now influenced by the 

 stimulation at that point ot reticular brain stem. 



