Peek‐a‐What? Infants’ Response to the Still‐Face Task After Normal and Interrupted Peek‐a‐Boo

Abstract

Infants’ sensitivity to the vitality or tension envelope within dyadic social exchanges was investigated by examining their responses following normal and interrupted games of peek‐a‐boo embedded in a Still‐Face Task. Infants 5–6 months old engaged in two modified Still‐Face Tasks with their mothers. In one task, the initial interaction ended with a sequence of normal peek‐a‐boos that included tension build‐up, peak, and release. In the other task, the initial interaction was followed by a sequence of peek‐a‐boos that ended with an interrupted peek‐a‐boo in which the build‐up was followed directly by the still face. Infants showed the still‐face effect with their attention and smiling when the still face followed the normal peek‐a‐boo sequence, but only with smiling when the still face followed the sequence with the interrupted peek‐a‐boo. Infants’ social bidding to their mothers in the still‐face phase was greater following the interrupted peek‐a‐boo sequence. When social exchanges are interrupted before the closure of the vitality envelope, infants respond with more attention vigilance and social bidding, demonstrating their awareness of the structure of social exchanges.