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Clip feature distributions for infant-directed song (orange - left) and infant-directed speech (blue - right): (A) Mean pitch; (B) Pitch variability (measured as standard deviation); (C) Tempo; (D) Rhythmic Variability; (E) Saliency of Audiovisual Synchrony (AVS) in the Mouth ROI; (F) Positive Affect. The grey squares show each feature’s average per clip type.
