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Edward Tronick and colleagues: When a parent held a still, blank face for only two minutes, babies strained to win the face back, then turned away in distress. They were reading us long before they could speak.

On What Children See, The Cascade of Hearth
Hearth 8:10
When a parent held a still, blank face for only two minutes, babies strained to win the face back, then turned away in distress. They were reading us long before they could speak.
Edward Tronick and colleagues, 1978 · the still face experiment in face-to-face interaction