l62 



BRAIN MECHANISMS AND LEARNING 



SO mild or unstable as to be ambiguous or a forced position habit renders 

 results ambiguous (sec caudate placement in Fig. 9). 



(2) MappiiK^. — Mapping these effects, we tnid the surprising result that 



40n 



PERIAMYGDALOID 



ANT. THAL. 



20-1 / 17^v 





ANT. THAL 



U 



i n u t e s 



Fig. 8 

 Interference effects. Control curves (in background) show errors eliminated (dotted lines) 

 correct responses cumulating (solid lines). On days when animals run under ctTccts of stimula- 

 tion (double lines in foreground), errors are not eliminated. 



the mcdial-forebrain-bundle regions of the hypothalamus, its extensions 

 into the tegmentum and basal ganglia, and the relatcti structures of the 

 paleocortex are the places most apt to yield confusion upon electric 

 stimulation. Stimulation in the neocortex, sensory thalamus, and large 



