28 



STELLA BURNHAM VINCENT 



the time of learning in spite of this is decreased. Comparing the 

 two it is seen that when the vibrissae were cut on the right side 

 forcing the animal to the left where there were fewer bliVid alleys 

 the errors were greatly decreased at first and the time of learn- 



7 8 



10 



Yig. 9 — Learning curves, time and error, of rats with vibrissae cut on the left 

 side. 



ing much less. On the other hand the total number of errors 

 was almost the same in the two groups but the curves show 

 radical differences. Where the cut had been made on the right 

 the error curve begins lower and there is an almost uniform 

 descent and the last fifth represents a practical automatism. 



