CEREBRAL FUNCTION IN THE RAT 



99 



Like the animal in experiment 21 he seemed to retain a gen- 

 eral response to the region of the plane but to have lost the 

 specific reactions used in springing it. 



Lesion (plate III, fig. 22). Right hemisphere. There is a 

 vertical transverse lesion extending downward from the anterior 

 horn of the lateral ventricle to the cerebral peduncle, without 



sec, 



. . , 

 trials 



FIG. 10. RATE OF IMPROVEMENT IN TRAINING AND RETENTION TESTS FOR 



EXPERIMENT 22 

 Arranged as figure 8 



involving this, however. On the antero-dorsal convexity there 

 is a lesion corresponding to the trephine opening, with the cortex 

 cephalad to it somewhat degenerated. The deeper lesion in- 

 volves little destruction, as the cut follows the course of the fibers. 

 Left hemisphere. The lesion on the dorsal convexity is 

 somewhat larger than that on the right. There is ,a large cavity 





