Developmental psychologist Edward Tronick developed the Still Face Paradigm in 1975 to demonstrate how sensitive infants are to social responsiveness — and how rapidly emotional breakdown occurs when it's withdrawn.

The Three Phases

1. Normal interaction: Mother and infant engage naturally — smiling, vocalizing, pointing. The infant is engaged, happy, and responsive.
2. Still face: The mother is instructed to become entirely expressionless — holding eye contact but showing zero emotion or response.
3. Reunion: The mother resumes normal interaction.

The Infant's Response

Within seconds of the still face, infants begin trying everything to re-engage the mother — smiling more intensely, pointing, vocalizing. When nothing works, they turn away, withdraw, become distressed, and begin crying. The deterioration is rapid and complete.

Why It Matters

• Infants are wired for reciprocal social engagement from birth
• The absence of response is processed as a serious threat — not merely neutral
• Maternal depression, emotional unavailability, and chronic neglect create persistent still face conditions with documented developmental consequences

Reference:

Wikipedia: Still Face Experiment

https://en.wikipedia.org/wiki/Attachment_theory