DISCRIMINATIVE RESPONSES TO VISUAL STIMULI 473 



than those given under either of the other conditions. The 

 results show that this estimate was unreliable. 



Subject E was twenty-three years old, unmarried, a senior 

 in the college for women, Western Reserve University. She had 

 had no previous training in photometric observation or in other 

 laboratory work, and required 4500 reactions, equally distributed 

 among the three conditions, to reduce the percentage of incorrect 

 responses to an acceptable minimum. The reactions accumu- 

 lated in this period of training are not included in the averages. 



Subject M was an unmarried woman, twenty-one years old, 

 and a high school graduate. Her principal occupation was the 

 manufacture of a trousseau. This with activities incidental 

 thereto occupied most of her interest as well. She was trained 

 with some little difficulty but after 2400 reactions, equally dis- 

 tributed among the three conditions, she gave the results which 

 are presented below. In the 5400 reactions which are presented, 

 a considerable improvement with practice is noticeable. 



Subject A was a left-handed, unmarried man, twenty-two 

 years old, with high school training. He was employed as an 

 assistant in the laboratory. He exhibited definite psychotic 

 traits which would be regarded by some psychiatrists as definite 

 symptoms of an overcompensated inferiority-complex, having a 

 sexual basis. He collected tickets at evening performances in 

 a cinematographic house in order to supplement his salary, and 

 also to study the actors, some of whom he imitated quite credit- 

 ably as to mannerisms of pose and dress. Despite repeated 

 explanations of the uses of reaction-time determinations, he 

 persisted in regarding the experiment as a test of his "mind" 

 and therefore exerted himself to the utmost in order to give the 

 shortest possible reaction. The result was 289 incorrect or 

 anticipatory reactions given with the 5400 correct ones which 

 are presented. The averaged series were preceded by 1000 reac- 

 tions obtained for purposes of training. All except the first 100 

 were equally distributed among the three external conditions. 



None of the subjects required refractive correction in the 

 eye used in observation. 



