The visual cliff: cardiac and behavioral responses on the deep and shallow sides at five and nine months of age.
D000367:Age Factors; D001288:Attention; D002652:Child Behavior; D002657:Child Development; D003867:Depth Perception; D005239:Fear; D005260:Female; D006339:Heart Rate; D006801:Humans; D007103:Immobilization; D007223:Infant; D008124:Locomotion; D008297:Male; D009043:Motor Activity; D009949:Orientation; D013315:Stress, Psychological; D014796:Visual Perception; D014831:Voice