SECTION THREE 



FEATURES BEARING ON LEARNING 

 A. Positive 



(1) Light— Two groups, I and II, were trained with the 

 light stimulus and were then transferred to the sound. The 

 following tables give the results as to the number of trials 

 and series of trials necessary for learning the light sufficiently 

 well to meet the standard of 95 correct choices out of 100 

 chances. 



Group I 

 Animal Trials Series 



No. 15 680 34 



No. 16 880 44 



No. 22 640 32 



No. 23 460 23 



No. 26 340 17 



Average 600 30 



Group II 



Animal Trials Series 



No. 17 920 46 



No. 18 580 29 



No. 19 580 29 



No. 20 600 30 



No. 21 540 27 



No. 25 560 28 



Average 630 31 .5 



Average for 11 animals, 616.36 trials, 30.81 series. 



This average for eleven animals can be taken as a normal 

 record for learning a positive reaction to a light stimulus 

 under the conditions of the experiment. 



It will be noticed there is great variation in the number 

 of series and trials required for the individual animals to 

 learn the response. Thus number 26 needed only 17 series 

 or 340 trials, while number 17 took 46 series or 920 trials. 

 For this reason group curves would not show the character- 

 istics of the learning process. So two typical individual 



