Neural Mechanisms of Decision Making 



253 



*- ■- i_A_ *- — *— 



-\>^^- 



R. MOTOR 



L. VISUAL 



SEC. 



50>iV 



I I i I 1 » 1 > I I I I 



L. EMG 



^\r -~\ 



\: 



R. EMG 



^'»^- 



Fig. 5. 



L. MOTOR — Left motor cortex 



R. MOTOR — Right motor cortex 



L. VISUAL — Left visual cortex 



L. EMG— EMG of left hind limb 



R. EMG— EMG of right hind limb 

 Electrical responses to five per second flicker during generalization of right hind 

 leg flexion response after training with a three per second flicker (rabbit). (From 

 Majkowski, J.: Acta Physiologica Polomca, /A'( 5): 565-581, 1958.) 



the conditioned response, during which the animal was taught to 

 discriminate between ten and four per second flicker. Note that 

 the visual cortex now displays markedly increased regularity of 

 ten per second potentials during the ten per second flicker. 



As is evident from the stimulus trace, these two records were 

 obtained using a "limp circuit" which periodically deleted a flash 

 from the flicker train. The purpose of this technique was to attempt 

 to evaluate the extent to which endogenously generated potentials 

 would "fill in" the period of the deleted flash. Sufficient data have 

 not yet been obtained to warrant discussion of this aspect of the 

 records, and it is not central to our present purpose. 



