title: Habituation and dishabituation of cardiac responses in 4-month-old, alert infants.
mesh_terms: D000161:Acoustic Stimulation; D001143:Arousal; D001307:Auditory Perception; D002657:Child Development; D003214:Conditioning, Classical; D004192:Discrimination, Psychological; D005260:Female; D006185:Habituation, Psychophysiologic; D006339:Heart Rate; D006801:Humans; D007223:Infant; D008297:Male; D009949:Orientation; D010507:Periodicity; D012890:Sleep; D013016:Sound; D013997:Time Factors