Babies have periodic 'alert phases' which signal that they are ready for interaction. Mothers typically pick up on and respond to infant alertness around two-thirds of the time (Feldman and Eidelman, 2007)
From around 3 months old, this interaction becomes more frequent and involves close attention to each other's verbal signals and facial expressions (Feldman, 2007)
The temporal co-ordination of microlevel social behaviour where mother and infant interact in such a way that their actions and emotions mirror each other
Meltzoff & Moore (1977) observed the beginnings of interactional synchrony in infants as young as two weeks old
An adult displayed one of three facial expressions or one of three distinctive gestures. The child's response was filmed and identified by independent observers. An association was found between the expression or gesture the adult has displayed and the actions of the babies
Isabella et al. (1989) observed 30 mothers and infants together and assessed the degree of synchrony. They found that high levels of synchrony were associated with better quality mother-infant attachment (e.g. the emotional intensity of the relationship)
Schaffer and Emerson (1964) found that the majority of babies did become attached to their mother first (at around 7 months) and within a few weeks or months formed secondary attachment was formed with the father by the age of 18 months
Grossman (2002) carried out a longitudinal study looking at both parents' behaviour and how it relates to the quality of children's attachments into their teens. Quality of infant attachment with mothers was related to children's attachment in adolescence suggesting that father attachment was less important. However, the quality of fathers' play with infants was related to the quality of adolescent attachments
Field (1978) filmed 4-month old babies in face-to-face interaction with (1) primary caregiver mothers, (2) secondary caregivers fathers and (3) primary caregiver fathers. Primary caregiver fathers, like mothers, spent more time smiling, imitating and holding infants than the secondary caregiver fathers - This behaviour appears to be important in building attachment with the infant