274 



Information Storage and Neural Control 



TABLE III 



Effects of Electrical Stimulation of Visual Cortex at 



Various Delays After Presentation of Four per Second Flash 



From Peripheral Tracer Conditioned Stimulus 



{2.8 mA, 100/cps. Biphasic, 2 mS Pulse Width, 25 mS Duration) 



CR No CR 



Delay 



Delay 



Delay 



15 mS 

 80 + no mS 



X2 =11.7 

 p < .001 



X2 = 15.1 

 p < .001 



X2 =25.7 

 p < .001 



that the processing of information about the peripheral conditioned 

 signal is at a more crucial stage in the visual cortex, or at the site 

 to which the central stimuli propagate, during the late phase of 

 the cortical evoked potential than during the early phase. Examina- 

 tion of average response computations from various brain structures 

 in this animal suggests that the late phase of the cortical average 

 response waveform varies in form and latency with the average 

 response seen in reticular formation and centralis lateralis. 



SUMMARY AND CONCLUSIONS 



Diverse kinds of evidence have been presented here both to 

 illustrate the nature of research in progress and to evaluate a body 

 of data. Although the number of animals for which each of these 

 kinds of data has been obtained is as yet small, the consistency and 

 the clear statistical significance of these intensive studies seem to 

 warrant some consideration at this time. 



Findings have been reviewed which show a correlation between 

 certain electrophysiological phenomena and differential condi- 

 tioned behavior. Results have been presented from a number of 

 studies primarily designed to explore two hypotheses based on 

 this earlier work: 1) The configuration of labeled potentials in 



