Abstract
Bright and dull rats of the 11th generation of strains used in Heron''s automatic maze study were tested on Maier''s three table reasoning test. Maze dull rats made better scores on the reasoning test than did the maze-bright rats., There was no evidence that there is an ability common to the 2 problems. Variation in motivation and the reaction-tendency components utilized by the animals bear a slight relation to the reasoning score.

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