1 64 



BRAIN MECHANISMS AND LEARNING 



Fig. 10 

 Mapping of interference effects. Plus marks indicate complete interference with 

 learning, i.e. more than three times normal number of trials without meeting 

 criterion. Open circles indicate no clfect of stimulation. Closed circles indicate 

 ambiguous effects as noted in text. Other nictations are: S — seizure, P — forced 

 position preference, A — activation. 



