KIN AESTHETIC PKOCESSES IN THE WHITE RAT 11 



other words, the animal first turned to the left, then alternated 

 to the right as usual. Failing to receive the sensory complex 

 associated with success, he ran one more trial to the right than 

 usual. The impulse to run to the left now asserted itself, and the 

 remainder of the runs were made to that side. The next day the 

 same control was used and the rat ran IrrlrllllL Here the inter- 

 ference of the reaction tendencies peculiar to the first and last 

 halves of the normal reaction comes in the fourth and fifth trials. 

 The tendency to run to the right until success was encountered 

 was so strong that after the fourth choice was made the rat 

 retraced his steps and investigated the end-stop on the right. 

 He went again on the following trial to the right side, and only 

 then did the turn-left tendency predominate. This same type 

 of behavior was repeated when the series of choices was changed 

 to lllllllrrr. When a series composed wholly of rights was used, 

 the animal happened to go to the right on the first trial where- 

 upon he went left for the rest of the series. As a final test the 

 rat was inserted without either entrance- or end-stop. It was 

 thus possible for the animal to run in any direction. If the end- 

 and entrance-stops were not serving as partial cues, the kinaes- 

 thetic tendencies should unroll in the normal manner. The 

 result of the control was for the rat to make all of its choices to 

 the left with a great deal of retracing in a clockwise direction, 

 due apparently to the absence of the entrance-stop. 



These controls indicate that the normal integration of the two 

 reaction tendencies of rat 105 depended upon sensory complexes 

 from outside the animaFs body. The impulses for running right 

 and left, undoubtedly carried in proprio-ceptive terms, depended 

 for their normal functioning upon extero-ceptive data. 



Rat 106 also had the tendency to alternate after each success 

 in the first of the series, although the total series was never autom- 

 atized as with rat 105. Controls were used where the series 

 of choices in place of being double alternation were lllllrrrrr and 

 lllllllrrr. This rat always ran to the left the first trial, then to 

 the right until successful and then to the left, thereby alternating 

 after each success. The sensory complex from running against 

 the end-stop (failure) produced a return to the same side until 



