The effects of frequency modulation on middle ear reflex.
The effect of frequency modulation on acoustic middle ear muscle reflex persistence was studied. Changes in impedance at the tympanic membrane were used as an indirect indication of reflex activity. Signals were a 2-kHz pure tone, a narrow band of noise centered at 2-kHz, and FM signals centered at 2-kHz modulated 70, 140, and 280 times per second.
D000161:Acoustic Stimulation / Q000379:methods*; D001301:Audiometry, Pure-Tone; D004432:Ear, Middle / Q000502:physiology*; D006801:Humans; D012022:Reflex, Acoustic; D013016:Sound; D014432:Tympanic Membrane / Q000502:physiology