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Schematic drawing of the events shown in Exp. 4. Whether the fur-can trial or the box trial was shown first in the familiarization trials (A and B) was counterbalanced across infants in each condition. In the test trial (C), infants saw either the fur-can or the box trial. The silent-control condition (not shown) was identical to the self-propelled condition except that in the test trial the fur-can or box produced no noise when shaken.
