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So why do sounds with frequencies between 1-2 kHz cause the effect? My guess is that the effect is produced by activation of various myogenic reflex responses including the stapedius response, the post-auricular response and responses of other muscles innervated by the facial nerve (and possibly the trigeminal nerve). It so happens that the tuning curves of stapedius motorneurons have their best frequencies between 1-2 kHz with a threshold of about 75 dB in the cat (see Kobler et al. (1992), J. Neurophysiol. 68, 807-817).