TRANSFER OF RESPONSE IN THE WHITE RAT 53 



Group X 

 This group was given four simultaneous light and sound 



Animal Trials Series 



No. 93 105 7 



No. 94 105 7 



No. 95 105 7 



No. 99 105 7 



No. 102 105 7 



Average 105 7 



Summary of Results 



Trials Series 



Average for learning sound (negative) shown in normal records . . 525 .5 35 . 03 



Gained by direct transfer 373 24.87 



Gained by 2 simultaneous light and sound 375.5 25.03 



Gained by 4 simultaneous light and sound 420.5 28.03 



The first thing to be noticed in the results is the fact 

 that it is a decided advantage in learning the response to 

 the sound to learn first the response to the light and then 

 substitute the sound stimulus for the light stimulus either 

 directly or with a few intervening series in which the sound 

 and light are simultaneously given. Thus it took on the 

 average 35.03 series for the animals to learn the response 

 to the sound when no previous training had been received 

 in making such a response. But by training first with the 

 light stimulus and then substituting directly the sound 

 stimulus only, 25.96 series were needed for learning the 

 response to both the light and the sound and only 10.16 of 

 these series were used in learning the response to the sound. 

 That represents a saving of 24.87 series in learning the 

 response to the sound by first learning the response to the 

 light. By presenting the two stimuli simultaneously for 

 a few series after the response to the light had been learned, 

 a greater saving was effected. Thus with two simultaneous 

 series a saving of 25.03 series was secured, while with four 

 simultaneous a saving of 28.03 series was secured. This 

 means that by training with the light until the response 

 had been learned and by giving four series with light and 

 sound simultaneously, the animals were trained to respond 

 to the sound alone with a sufficient degree of accuracy to 

 enable them to meet the standard during the next seven 

 series, the shortest possible time in which they could meet 

 the standard set. It also means that the quickest way for 



