206 



Information Storage and Neural Control 



Carhodoi Polarization Ancdal PolorizQt-ion 



R3Z Qc -60 



O Polarization of motor cortex 

 -0' O Polarisation of viiual cortex 

 © ® Polarization of ear 



25 



Tim<2 in claims 



Fig. 14. Effect of cathodal and anodal polarization applied on different occasions 



in the same animal. Note again the marked decrease in performance following 



a six day break in the training schedule. 



that performance was significantly altered on the day on which 

 polarization was carried out at any of the three sites. It is interesting 

 that in every instance (see also Fig. 14) there was an abrupt rise 

 in the response per cent on the day following anodal polarization 

 of visual cortex. 



Figure 14 presents the data on one of the two animals receiving 

 both anodal and cathodal sequences. Note again the depression 

 of performance during passage of cathodal current in visual cortex 

 and the maintenance of depression on the day following. The usual 

 performance decay following a lapse in training is also apparent. 



In the same animal the application of anodal current to the 

 same three areas resulted in no significant change. Yet on the 

 day following the visual anodal polarization performance reaches 

 its all time peak for this animal. 



Figure 15 illustrates sample records of conditioned responses 

 obtained under the various conditions in this experiment. Figure 

 15A represents cathodal polarization of the motor cortex. Note 

 the characteristically long latency of the CR although the animal 

 responded correctly as many times per session as it would without 



