The role of intersubjectivity in intentional communication

The present account explains (i) which elements of the act of nonverbal reference are intersubjective, (ii) which major effects intersubjectivity has on the development of intentional communication and at what stages, and (iii) how intersubjectivity contributes to trigger the general capacity for nonverbal reference in the second year. First, intersubjectivity is analysed in terms of a mutual or individual, dyadic or triadic, sharing of experiences. It is then shown that nonverbal reference presupposes intersubjectivity relative to communicative-intent indicating and referential behaviour, and the modification of previous behaviour in response to communication failure. It is argued that different forms of intersubjectivity entail different types of communicative skills. A comprehensive analysis of data on various gaze-related intersubjective behaviour in young infants shows that interaffectivity and interattentionality enable referential skills early in development and together allow for complex behaviour, but also that early referential skills arise by other mechanisms than in nonverbal reference and their functions do not overlap. Reliable and consistent use of nonverbal reference occurs when interaffectivity and interattentionality coalesce with interintentionality, which affords general cognitive skills, and these capacities together permit a decontextualisation of communicative behaviour