18 dogs (basenjis) were tested on 3 consecutive intermediate size-discrimination and transposition problems in a modified Wisconsin General Test Apparatus (WGTA). Solution of the discriminative task required significantly fewer trials across successive problems. Dogs generally responded to the absolute size of the stimulus. However, (a) delayed or repeated testing or (b) tests in the direction of the animal's original size preference facilitated responses to the relative middle-size stimulus.
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