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Social stereotyping and prejudice are intriguing phenomena from the standpoint of theory and, in addition, constitute pressing societal problems. Because stereotyping and prejudice emerge in early childhood, developmental research on causal mechanisms is critical for understanding and controlling stereotyping and prejudice. Such work forms the basis of a new theoretical model, developmental intergroup theory (DIT), which addresses the causal ingredients of stereotyping and prejudice. The work suggests that biases may be largely under environmental control and thus might be shaped via educational, social, and legal policies.

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Three- to 4-month-old female and male human infants were administered a two-dimensional mental-rotation task similar to those given to older children and adults. Infants were familiarized with the number 1 (or its mirror image) in seven different rotations between 0 degrees and 360 degrees, and then preference-tested with a novel rotation of the familiar stimulus paired with its mirror image. Male infants displayed a novelty preference for the mirror-image stimulus over the novel rotation of the familiar stimulus, whereas females divided attention between the two test stimuli. The results point toward an early emergence of a sex difference in mental rotation.