Attempts have been made to apply the circular reaction theory of J. M. Baldwin to the early interchanges between the infant and the parent. Baldwin's theory of sensorimotor suggestion or theory of imitation was furthered by the work of Piaget, with some exceptions. Baldwin held the view that the capacity for social interaction is congenital and that it is the key to mental and personal development. These missing links from Baldwin's phylogenetic perspectives put Baldwin's sensorimotor theory on par with modern infant research.