Mutual gaze in pre-school Down's and normal children.
D002656:Child Day Care Centers; D002675:Child, Preschool; D004314:Down Syndrome / Q000523:psychology*; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D009633:Nonverbal Communication; D009724:Nurseries, Infant; D012801:Sibling Relations; D014743:Videotape Recording