Yerkes and Dodson, Habit Formation. 



475 



II the difference in brightness of the electric boxes was great; that 

 for set III it was shght; and for set I, intermediate or medium. 



For the experiments of set III only one pair of dancers was 

 trained with any given strength of stimulus. The results, how- 

 ever, are not less conclusive than those of the other sets of experi- 

 ments because of the smaller number of individuals used. The 

 data of tables 1 1 to 14 prove conclusively that our supposition was 

 correct. The varying results of the three sets of experiments are 

 explicable in terms of the conditions of visual discrimination. In 



