Vocalizing in unison and in alternation: two modes of communication within the mother-infant dyad.
D000328:Adult; D001143:Arousal; D003142:Communication; D005260:Female; D006801:Humans; D007223:Infant; D007804:Language Development; D008297:Male; D009034:Mother-Child Relations; D009633:Nonverbal Communication; D010988:Play and Playthings; D011247:Pregnancy; D014427:Twins; D014705:Verbal Behavior