“…In the first year, children's exploration of objects, play, vocalizations, and actual bids to mother constitute prominent indicators of affect, attention, communication, and cognitive functioning. The extent to which children engage in these activities varies substantially, as do the responses of mothers to these different modes of childhood expression (Baumwell, Tamis-LeMonda, & Bornstein, 1997;Bornstein et al, 1992;Rogoff, Mistry, Radziszewska, & Germond, 1992; Tamis-LeMonda, Bornstein, Baumwell, & Damast, 1996). Mothers who respond promptly, contingently, and appropriately to their children's activities are thought to inculcate a sense of self-efficacy, motivation, and security of attachment in them (Ainsworth, 1973;Bornstein et al, 1992;Matas, Ahrend, & Sroufe, 1978;Skinner, 1986;Watson, 1985).…”