MOVING AND STILL LIGHTS AS STIMULI IN A 



DISCRIMINATION EXPERIMENT WITH 



WHITE RATS 



CORA D. REEVES 



The work here reported was done in the spring of 1912 under 

 the direction of Prof. J. B. Watson, by whom the problem was 

 suggested. As the work of others may be furthered I present 

 briefly results compiled at the close of the experiment. 



Apparatus. — The apparatus consisted of two crayon boxes, 

 9.3 x 10.5 x 16 cm., blackened inside and out, and each with 

 a doorway cut in one end. To each, on the end opposite the 

 opening, was attached a narrow, vertical support with a hori- 

 zontal bar on the top of it. Suspended from this bar and imme- 

 diately above the door was a miniature tungsten, 2 c.p. lamp, 

 thus: 



Figure 1. — Elevation of food-box 



Rats tested. — The animals used were four male albino rats of 

 the same litter. They had learned the maze but were not yet 

 quite full grown. 



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