T. PINTO HAMUY 



599 



signal (unpublished observations). Once the learning was achieved, they 

 were decorticated and subsequently trained in a CR to a light signal 



10 15 20 



TEN TRIAL UNITS 



Fig. 9 



25 



Pre- and post-operative learning of a VCR in a group of seven rats. 



(Fig. lo). In this case, the experience oi the general experimental situation 

 was enough to obtain a level markedly superior tc^ that obtained by the 

 decorticated rats without any previous training. 



10 15 



TEN TRIAL UNITS 



20 



Fig. id 

 Learning curves of a VCR in two groups of neodecorticated 

 rats. One with preoperative training in an ACR; the other with 

 no preoperative training. 



We believe that our results and those of other authors show that it is 

 difficult to generalize about the function of different structures of the 

 central nervous system in a specific type of learning. 



