Field 1978 filmed 4 month old babies face to face interaction with pcg mother, pcg father, and scg father. Pcg mothers spent more time smiling and imitating their baby compared to scg fathers. These are all signs of interactional synchrony and reciprocity which are part of the attachment process. Fathers have the potential to be a more emotionally focused pcg figure as they are able to provide the responsiveness for a close emotional attachment but it may only happen when they are given the pcg role.