50 JOSEPH U. Y ARE ROUGH 



the first i.e., either before or during or after the motor response 

 has occurred. In the present experiments light and buzzer were 

 introduced in this way in relation to the motor response, and the 

 results indicate in both instances the superiority of simultaneous 

 presentation. The learning was more rapid when light was used 

 than when sound, but this fact is due rather to transfer of train- 

 ing than to a difference in stimuli. 



