Nathan A. Fox, Kenneth H. Rubin, Susan D. Calkins, Timothy R. Marshall, Robert J. Coplan, Stephen W. Porges, James M. Long, Shannon Stewart, Frontal Activation Asymmetry and Social Competence at Four Years of Age, Child Development, Vol. 66, No. 6 (Dec., 1995), pp. 1770-1784
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Fox et al. (1995) studied this question.