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Caregiver voices may offer signs to set in motion or calm babies. This research study checked out whether mother's prosody forecasted adjustments in babies' biobehavioral state after the still face, a stressor in which the mommy withdraws and restores social engagement. High values on the maternal prosody compound were connected with decreases in babies' heart rate and behavior distress, and raises in heart vagal tone in babies whose vagal tone was low during the stress factor. High baby heart rate anticipated increases in the maternal prosody compound.
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