1 66 



BRAIN MECHANISMS AND LEARNING 



MODERATE IMPAIRMENT 



LEARNING DECREMENT 



COMPLETE IMPAIRMENT 



Fig. II 

 Correlation of interference with self-stimulation. Each point stands for one electrode pair. 

 The position on the ordinate indicates the self-stimulation rate for an 8-minutc test period 

 (current set at optimal level in lo- to 50-pamp. range). Three categories on abscissa indicate no 

 interference, ambiguous interference, and total interference. 



Self-Stimulotion Test of 26 Points Which Yield Confusion 



s = 5e/f stimulation 



Basal Ganglia 



*- No self stimulation 

 Hpc 



Points where self-stiniulatic 



electrodes (S) and non-self-stimulation electrodes (#) 

 yielded confusion. 



