Stapedius reflex and monaural masking.
D000161:Acoustic Stimulation; D000200:Action Potentials; D001299:Audiometry; D001309:Auditory Threshold; D004429:Ear Ossicles / Q000503:physiopathology*; D005158:Facial Paralysis / Q000503:physiopathology*; D006801:Humans; D009622:Noise; D010470:Perceptual Masking; D013199:Stapes / Q000502:physiology / Q000503:physiopathology*