Zeynep Biringen, Robert N. Emde, Joseph J. Campos, Mark I. Appelbaum, Affective Reorganization in the Infant, the Mother, and the Dyad: The Role of Upright Locomotion and Its Timing, Child Development, Vol. 66, No. 2 (Apr., 1995), pp. 499-514
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Biringen et al. (1995) studied this question.