ABSTRACT
The author and the work described here were supported by grants from the National Science Foundation (BNS 8316318) and from the National Institutes of Health (HD-18286 and HD 22514). I am indebted to Karen Wolak, Craig Harris, and Kerry Green for assistance in the experiments, Karen Wolak for helpful comments on the manuscript, Andy Meltzoff for discussions of the issues raised here, and KKM for inspiration.
