Neural Adechanisms of Decision Making 



257 



8C) obtained from the visual cortex during behaviorally appropri- 

 ate response to ten per second and four per second flicker. 



Figure 8D shows the approximation to the generalization wave- 

 form which can be produced by these simple algebraic manipula- 

 tions. At each point of the curve, the manipulation which gave the 

 better approximation (10+4 or 10— 4) was selected. It is not clear 

 what the physiological basis might be for the particular sequence 

 of algebraic operations used to achieve this approximation. 



AVERAGE RESPONSE 



4cps AFTER AVOIDANCE 

 TRAINING 



RETICULAR FORMATION 



100 SWEEPS 



250ms 



DARK PERIOD 



100 SWEEPS 



B. 

 DURING GENERALIZATION 

 lOcps AFTER TRAINING 

 TO 4cps 



C. 



lOcps AFTER DIFFERENTIATION 



lOOms 

 DARK PERIOD 



CALCULATION OF B FROM 

 C + A AND C-A 



26 ms 



- — GENERALIZATION WAVEFORM 

 °—o CALCULATED WAVEFORM 



0=10 + 4 •=10-4 



Fig. 9. As Figure 8, but data derived from mesencephalic reticular formation. 



