Interactive devices of two‐year‐old dyads: A twin and nontwin comparisonFootnote∗This research was supported in part by NIMH grant number MH30996, a Rackham Graduate School Faculty Research Grant, and a Guggenheim Fellowship to M. Shatz and a USPHS predoctoral training grant 5732 HD07109 to D. Billman. We thank Pamela Waterman, Katheleen Vakalo, Jane Remler, Perry Gilmore, and Susan Livingston for assistance in collecting, transcribing, and coding data; Henry M. Wellman and Louise C. Wilkinson for comments on an earlier version of the manuscript; and J. Keith Smith and Alex C. Wilkinson for statistical advice.
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