Bowlby also recognised that the attachment was not purely dependent upon the social and emotional interaction between the infant and caregiver. It is also heavily dependent upon the infant’s cognitive development in terms of being able to represent an object that is not physically present. He based his argument on Piaget’s contention that this level of object permanence is not acquired until the infant is about eight months old. Thus, Bowlby suggested that attachment occurs in stages so as to allow for the needed cognitive development which enables the infant to miss an attachment figure and hence, demonstrate attachment behaviour. Bowlby claims that during the first phase (0-2 months) infants begin to develop a repertoire of signals, of which the cry is most
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