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Information Storage and Neural Control 



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Fig. 16. Electroencephalogram of an unanesthetized rabbit twenty-four hours (A) 

 and three days (B) after production of an ethyl chloride lesion. The site and ex- 

 tent of the lesion are indicated by the cross-hatched area on the diagram. Deriva- 

 tions are bipolar from implanted electrodes over the indicated regions. Cali- 

 brations: 50 microvolts and one second (39). 



respect to cells undergoing convulsive discharge. However, there 

 was another phenomenon noted in the animals with chronic 

 experimental epilepsy which made it possible to probe more 

 deeply into the relationsliip between ribonucleic acid and cellular 

 memory (43). 



Freezing a small segment of the surface of one cerebral hemi- 

 sphere results within a few hours in the appearance of high voltage 

 epileptiform spikes confined to the site of the primary lesion. These 

 are illustrated in the upper part of Figure 16. Simultaneous 

 recordings from the opposite hemisphere and from other portions 

 of the same hemisphere did not reveal any abnormality. After a 

 time, varying from a few days to three weeks, one may observe 

 (Fig. 16B) the development of similar paroxysmal activity in an 



