Neural Mechanisms of Decision Making 249 



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Fig. 2. 



LG — Lateral geniculate 



VA — Nucleus ventralis anterior. Abbreviations otherwise as in Figure 1. 

 Characteristic electrical response on presentation of the ten per second flicker 

 conditioned stimulus to the fully trained animal (100% performance). (From 

 John, E. R. and Killam. K. F.: J. Pharmacol. Exp. Therap., 125:2S2-274, 1959.) 



several trials, during which a slow wave at about seven per second 

 could be observed in cortex, as shown in Figure 3B. When per- 

 formance reappeared to the ten per second stimulus, twenty-per- 

 second potentials again were elicited in cortex. 



Another example of this is provided by Figure 4, which illustrates 

 recordings obtained during generalization to a ten per second 

 flicker by a cat previously trained to perform a conditioned avoid- 

 ance response to a four per second flicker. Note that upon presenta- 



