“…For example, we have argued that 'peers are not substitutes for infant-adult relationships, but rather are just as basic and maybe older in a phylogenetic sense and just as vital for species survival' [Lewis, Young, Brooks, & Michalson, 1975, p. 61]. Infants in the first year of life are capable of complex and positive interactions with each other [e.g., Eckerman & Whatley, 1977;Vincze, 1971]. Vandell, Wilson, and Buchanan [1980] reported that, even at 6 months of age, infant peers were able to engage in sequences where both participants acted socially, primarily by using vocalizations, touches, and smiles.…”