biformation Storage in Nerve Cells 



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Fig. 21. Bilateral cortical isolation in an animal with well developed independent 

 mirror focus. This is the same animal shown in Figure 18. Recordings were 

 made with the animal under 40 milligrams per kilogram of nembutal anesthesia. 

 Derivations are from the electrodes indicated in the diagrams. Isolation of the 

 primary lesion is first carried out (21A) and demonstrates loss of paroxysmal 

 spike discharge in the primary region while the secondary area continues to 

 discharge actively. Isolation of the secondary region is then undertaken (21 B & 

 C). For a few moments abnormal discharge persists in the isolated secondary 

 region (B) but soon disappears (C) to be replaced by almost complete electrical 

 silence. Note that the electrode positions have been changed in B and C. Cali- 

 bration: 50 microvolts and one second (39). 



