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ELAN analysis detail of book sharing interaction with 6-month-old infant sitting at a 90° angle on mother's lap. Infant and mother looking at book together (A). Infant looking up at mother's face in conjunction with salient vocal event at (B). Affective communicative exchange with mutual reinforcement (C,D). The infant's gaze spontaneously returns the book (E), before mother's gaze returns there as well (F).
