Kagan (1970) found that a typical infant would find a toy they are completely unfamiliar with more interesting than a toy that was slightly different from one they have seen previously.

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Kagan (1970) found that infants showed more interest in toys that were slightly different from ones they had seen before, rather than toys they were completely unfamiliar with or exactly the same as ones they had previously encountered. This suggests that infants are most interested in stimuli that are moderately novel.

Kagan (1970) Found That a Typical Infant Would Find a Toy