title: Effects of stimulus intensity on autonomic responding: the problem of differentiating orienting and defense reflexes.
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001341:Autonomic Nervous System / Q000502:physiology*; D001921:Brain / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D004553:Electric Conductivity; D004594:Electrophysiology; D004777:Environment; D004924:Escape Reaction / Q000502:physiology*; D006185:Habituation, Psychophysiologic / Q000502:physiology; D006339:Heart Rate; D006801:Humans; D009949:Orientation / Q000502:physiology*; D011311:Pressoreceptors / Q000502:physiology; D011603:Psychophysiology; D011930:Reaction Time; D012018:Reflex / Q000502:physiology*; D013216:Reflex, Startle / Q000502:physiology; D012879:Skin Physiological Phenomena; D014661:Vasoconstriction; D014785:Vision, Ocular