title: Emotional expression in infancy; a biobehavioral study.
mesh_terms: D000339:Affect; D002652:Child Behavior; D002657:Child Development / Q000502:physiology*; D004569:Electroencephalography; D004644:Emotions / Q000502:physiology*; D005149:Facial Expression; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009420:Nervous System / Q000254:growth & development*; D012890:Sleep / Q000502:physiology; D014851:Wakefulness