Key points are not available for this paper at this time.
Robin Hornik, Nancy Risenhoover, Megan Gunnar, The Effects of Maternal Positive, Neutral, and Negative Affective Communications on Infant Responses to New Toys, Child Development, Vol. 58, No. 4 (Aug., 1987), pp. 937-944
Hornik et al. (Sat,) studied this question.