We addressed whether 4-month-old infants are primarily influenced by the expression or intention underlying a sudden still-face response by an adult social partner. Sixteen dyads of 4-month-old infants interacted with an adult who posed a still-face directed at one of the two infants. Infants' gazing and smiling responses confirm that they are primarily influenced by the emotional and contingency loss rather than the intention underlying the adult's still-face.
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