Allen, Associaiion in the Guinea Pig. 337 



Conclusions from tests A', XI and XII. 



I. There are no indications that the guinea pig prefers a 

 dark passage, or any particular color of light. 



II. A colored object in the visual field, if it be station- 

 ary, apparently has no significance in the recollection of the 

 path to food. 



III. Alterations in the tactual conditions of the environ- 

 ment, other conditions being as far as possible unchanged, cause 

 neither increase in reaction time nor confusion of movement. 



IV. Since neither odor, vision nor touch is alone of para- 

 mount importance, and since, when light is shut out, the odor of a 

 previous path being at the same time impossible and tactual con- 

 ditions being new, the recollection of a path remains accurate and 

 unconfused, we conclude that the factors of greatest importance 

 in recalling a path are the sensations of running and turning, 

 and of other movements gone through during a previous trial. 

 The innervations of these movements are no doubt especially 

 significant. 



V. Hearing, seeing, touching and smelling are all of them 

 important in the reactions of the guinea pig. 



Summary of Work with the Adult. 



1. The guinea pig can learn problems the solution of which 

 depends upon activity, but not those requiring ingenuity. 



2. The path to food is found first by accident, but when 

 it is once found, random movements are rapidly dropped out 

 and the reaction becomes almost automatic, providing no out- 

 side disturbing factors enter. 



3. Odor of food is a stimulus which induces reaction, but 

 the time required to learn the path from an odor stimulus alone 

 is longer than from stimuli affecting all the sense organs. 



4. Experiments to determine the efficiency of a visual 

 stimulus alone were negative. 



5. Kinesthetic sensations are of great importance in the 

 recollection of a path. 



[ 45 ] fe:^ 



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