title: Heart rate response to novel and signal stimuli in nonretarded and retarded subjects.
mesh_terms: D000161:Acoustic Stimulation; D000367:Age Factors; D001288:Attention; D001307:Auditory Perception; D002648:Child; D003214:Conditioning, Classical; D003216:Conditioning, Operant; D004495:Education of Persons with Intellectual Disabilities; D005108:Extinction, Psychological; D005260:Female; D006339:Heart Rate; D006801:Humans; D007266:Inhibition, Psychological; D008607:Intellectual Disability; D008297:Male; D009949:Orientation