204 



100 

 90 



60 

 50 

 40 



30 



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20 



'l 



♦- 



3-10 



4- 



c 



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t- 

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fj 70 

 o 



1 60 

 50 

 40 

 30 

 20 



Information Storage and Neural Control 



a. Cathodal Polarization CR2&C-0O) 



Polanz-ation (-) of mofor cortex 

 9 Polarization (-> of visual correx 

 (§) Polor'iz Qi-ion (-) of ear 



I \ r \ r 



b. Anodol Polarization (R290-0OJ 



O Polarization (■>-) of motor cortex 

 Polariz-otion (.-I-) of visual cortex 

 @ Polorizotiani.-*-) of ear 



10 - 



10 



15 20 



Titne in daqs 



25 



30 



Fig. 



12. Effect of cathodal (A) and anodal (B) polarization on learning curves in 

 two different animals. See text. 



ation, although on the second and third occasions when training 

 was omitted for four and three days, the usual decrease did occur. 

 It seems unlikely that the impaired performance on the day 

 following cathodal polarization was due to a long persisting effect 

 of the cathodal current. Indeed as we shall see later, the level of 

 decrement on the day after cathodal polarization of visual cortex 



