RONALD E. MYERS 



495 



eyes respectively. Krm achieved perfect scores on tinal overtraining with 

 both responses. The corpus callosum then was surgically divided in its 

 entire antero-posterior extent through a left sided craniotomy. After a 



^ 20r 

 o 



^_ 

 o 

 o 



E 



Z3 



o 

 o 



.a 



E 



Z3 



,o--o_ p 



Chr. 



5 10. 15 



Sets of twenty trials 



^ 20 

 o 



CD 



10- 



Myn 



5 10 15 



Sets of twenty trials 



Fig. 8 

 Performance of Chr and Myn with discrimination Il-ab on 

 initial training through one eye (sohd Hne) and on rclcarning 

 through the second eye (dashed line). Training and testing 

 procedures with this response were not strictly comparable 

 owing to need for variable encouragements. Therefore, only 

 the initial trials through each eye are represented. Neither 

 cat shows definite indication of immediate recognition 

 through the untramed eye. On the contrary, only slight 

 saving is suggested in relearning in the case of Chr and no 

 saving in the case of Myn. 



post-operative recovery period of 22 days tests were carried out through 

 first the trained and then the untrained eye on both responses. Performances 

 through trained eyes on both discriminations yielded perfect scores. 



