184 



K. S. LASHLEY 

 TABLE 3 



The Effect of Training in the Use of the Left Hand in One Situation 

 Upon the Reactions in Other Situations. Monkey No. 1 



At the end of these tests training for the exclusive use of 

 the right hand was instituted. The situation and method were 

 the same as in the preceding training, with the exception that 

 food was now withheld from the animal's left hand. After a 

 very few trials he began to use his right hand and a total of 

 only 40 failures was required to bring about the exclusive use 

 of the right hand. The course of learning is shown by the dotted 

 line in fig. 1 . Tests for transfer of this training could be made 

 only for the situation of taking food from the experimenter's 

 left hand. The transfer was evidently complete for this con- 

 dition, the animal using his right hand in 49 out of V S0 trials. 



DISCUSSION 



With clear evidence for a transfer of training in some situa- 

 tions and not in others, we must ask the reason for the selec- 

 tion. The one character in common to the situations in which 



