At this stage his "personality suggestion" is a _pain-movement-pleasure_ state of mind; to this he reacts with a smile, and a crow, and a kick.
Undoubtedly this association gets some of its value from the other similar one in which the movements are the infant's own.

It is by movements that he gets rid of pains and secures pleasures.
Many facts tend to bear out this position.

My child cried in the dark when I handled her, although I imitated the nurse's movements as closely as possible.

She tolerated a strange presence so long as it remained quietly in its place; but let it move, and especially let it usurp any of the pieces of movement-business of the nurse or mother, and her protests were emphatic.

The movements tended to bring the strange elements of a new face into the vital association, pain-movement-pleasure, and so to disturb its familiar course; this constituted it a strange "personality." It is astonishing, also, what new accidental elements may become parts of this association.