On the meaning of behavior: illustrations from the infant.
D000367:Age Factors; D001288:Attention; D002652:Child Behavior; D002657:Child Development; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D007223:Infant; D008297:Male; D012737:Sex Factors; D012923:Social Class; D014705:Verbal Behavior; D014796:Visual Perception