262 Information Storage and Neural Control 



After CAR to 6/S 



Fig. 12. Records obtained during lever press to 10 per second flicker after avoid- 

 ance training to the 6 per second flicker. Arrow indicates conditioned response. 

 (From John, E. R. and Killam, K. F.: J. Mrv. Merit. Dis., 7J7.-183-201, 1960.) 



of potentials in the lower record as contrasted with the upper; in 

 particular, observe the period of approximately ten per second po- 

 tentials in centralis lateralis. 



Figure 12 shows the potential configuration reliably obtained in 

 this cat in response to ten per second flicker following the establish- 

 ment of a conditioned avoidance response to the six per second 

 flicker, while the conditioned lever pressing" response to ten per 

 second flicker was maintained. At this stage in this animal, presenta- 

 tion of the ten per second flicker elicited clear labeled potentials 

 in visual cortex and several other structures, while an initial slow 

 wave at about six per second appeared in centralis lateralis and 

 fornix. Superimposed on this slow potential, almost as a modulation, 

 is a ten per second potential which gradually becomes clearer and 

 eventually dominates the record. Wlien lever press occurred to 

 the ten per second flicker, it almost invariably took place during 

 a period when the ten per second labeled potential dominated the 

 activity of centralis lateralis. Characteristically, as this correspond- 

 ence between the frequency of the dominant activity in the non- 

 specific structures and in the visual cortex occurred, a change 



