The presence of a response to stimulus change was investigated in a litter of 10 young opossums, 90 days of age. Ss were exposed to but not allowed to enter the arms of a T-maze, one of which was white and the other black. By this procedure Ss were thus satiated for both black and white. On a second trial Ss were presented with 2 black or 2 white arms. Novelty hypotheses predicted that Ss would enter the maze arm changed in color. In the current experiment, no significant preference for the changed arm was found. The results were interpreted as being either the result of maturational or arousal factors or a combination of both.
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