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Screen shot of child giving a correct toy selection. The host (the experimenter on the left) encourages the child to help when the actor (the experimenter inside the red “house”) indicates which toy she wants with her hands (using a pincer grip to indicate a small toy, and a whole-hand grip to indicate a large toy). The experimenters who appear here, as well as the parent of the child shown, gave signed consent for their images to be published in this article.
