the face stands in a pivotal position at every point along this developmental pathway. At the very beginning — before separation, before there is an object at all — the mother’s face is already there, as that which mediates attachment behavior
Schore argues that the mother’s face is the primary regulatory object of infant neurological development, structuring the orbitofrontal circuit that will govern all subsequent affect modulation.
, Affect Regulation and the Origin of the Self: The Neurobiology of Emotional Development, 1994thesis