WALTER S. HUNTER 



the right side of the apparatus, twice to the left side, etc.) ; and 

 a problem termed the " temporal maze," to be described below. 

 Kinaesthesis may be the fundamental sensory process for ani- 

 mals, and still the animals may be able to do very little with it. 

 Such a study as the present will aid in the solution of this problem. 

 Problem 1. The acquisition of a habit of simple alternation. 

 In this problem seven rats were used, each approximately four 

 months old. All were untrained in previous problems. The 

 apparatus was the T-shaped discrimination box of figure 1. 

 Punishment (electric shocks) and reward were used. As a pre- 



FIQ. 1. T-SHAPED DISCRIMINATION Box 



E is the end-stop; F, the feeding place; c, the point of choice for right or left 

 turns. The extent of the electric grills is shown by the brackets in the upper 

 alley. 



liminary, each rat was given the run of the box for two days prior 

 to the beginning of the regular test. During this initial period, 

 no end-stops were used and no food was given until the animal 

 was taken out for the day. In the regular tests the end-stop was 

 shifted so that the rat was forced at one trial to run to the left 

 in order to secure food and avoid punishment and at the next 

 trial to run to the right for the same purpose. The rat was fed 

 and the end-stop was shifted between trials. Ten trials were 

 given daily in the order Irlrlrlrlr. No external stimuli of light, 

 sound, or odor were present to guide the animal. The amount 

 of tune consumed between each trial was about twelve seconds. 



