William V. Fabricius, Paula J. Schwanenflugel, Patrick C. Kyllonen, Craig R. Barclay, S. Melissa Denton, Developing Theories of the Mind: Children's and Adults' Concepts of Mental Activities, Child Development, Vol. 60, No. 6 (Dec., 1989), pp. 1278-1290
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Fabricius et al. (1989) studied this question.