Define interactional synchrony
->two people are said to be 'synchronised' when they carry out the same action simultaneously
->interactional synchrony can be defined as the 'temporal co-ordination' of micro-level social behaviour'
->it takes place when mother and infant interact in such a way that their actions and emotions mirror the other
->infants have their bodies in tune with the rhythm of carers' spoken language to create a kind of turn-taking, as seen with two-way vocal conversations
->this serves to reinforce the attachment bond