Effect of the acoustic reflex on the impedance at the eardrum.
D001299:Audiometry; D004432:Ear, Middle / Q000502:physiology*; D004594:Electrophysiology; D006801:Humans; D009119:Muscle Contraction; D009622:Noise; D012018:Reflex; D014432:Tympanic Membrane / Q000502:physiology*