the linking of emotion and cognition has greatly extended and developed our understanding of social interaction in its earliest stages. The acknowledgement of a world of human development and growth which is not readily accessible to observation - namely the mind and its efforts to make sense or create meaning - has sparked an interest in babies. Notable psychologists have enriched our understanding. Daniel stern, for example, whose psychoanalytical background gave him a particular interest in what he termed the interpersonal world of the infant (Stern 1985) has drawn attention to sensitive periods in a baby's earliest months as the emergent,core,subjective and verbal self develop. Colwyn Trevarthen has also used as his starting point the relationship between mother and baby but has highlighted inter-subjectivity -a phrase which Stern suggest was devised by Trevarthen himself (see Pound 2009). using video footage Trevarthen has analysed protoconversation between monthers and babies and writes about motherese. Murray, Trevarthen's student, has studied the impact of a mother's depression on inter-subjectivity in babies