Injormation Storage in Nerve Cells 



203 





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Fig. 10. Unconditioned (A) and conditioned (B) avoidance response in the 

 rabbit as recorded by electromyogram of the right forelimb. The upper six 

 channels are EEG tracings obtained at the same time. Electrodes 1, 3, and 5 

 derive respectively from left motor, somatic sensory and visual corte.x. Electrodes 

 2, 4, and 6 are corresponding placements on the right hemisphere. Calibration: 

 50 microvolts and one second. Further explanation in the text. 



so 



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 -a 



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 9 Polarizorion of visual corr&x 

 ^Polarization of ear , 



15 



Time in daijs 



Fig. 11. Effect of cathodal polarization and of a break in training on a typical 

 learning curve. In this and subsequent curves only the later portion of the full 

 curve is plotted, i.e., beginning when the animal was making at least 40 per cent 

 correct responses. In most animals it took two to three weeks (or 280-420 trials) 

 before the level at which the graphs begin was reached. See text. 



