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Medial olivocochlear (MOC) efferents are driven by sound. (A) Tuning curves of type I cochlear afferents from single-unit recording in guinea pig. (B) Single-unit recording from MOCs in the brainstem show similar sensitivity and tuning to that of type I afferents. That is, MOCs are driven by input from type I afferents via second-order cells in the cochlear nucleus. SPL, Sound pressure level. (From Robertson and Gummer 1985; adapted, with permission, from Elsevier © 1985.)
