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- W2003758319 abstract "Presentation of an acoustic signal to one ear can suppress sound-evoked activity recorded at the opposite ear. The suppression appears to be mediated by medial olivocochlear (MOC) efferent neurons synapsing with outer hair cells (OHCs) and acting through the MOC neurotransmitter, acetylcholine (ACh). The purpose of the present investigation was to study the suppression of distortion product otoacoustic emissions (DPOAEs) by contralateral sound and to examine whether the suppression could be blocked by known antagonists of olivocochlear (OC) efferent activity. Urethane-anesthetized guinea pigs were used. Perilymph spaces of ipsilateral cochleae were alternately perfused with artificial perilymph and drugs at 2.5 microliters/min for 10 min. After each period of perfusion, DPOAEs were measured before, during and after contralateral wideband noise (WBN) stimulation. Pre-perfusion, contralateral WBN attenuated the ipsilateral DPOAEs between 1-3 dB. This suppression was blocked reversibly by strychnine (10 microM), curare (10 microM) and atropine (20 microM), known antagonists of OC efferent activity. These results confirm the findings of Puel and Rebillard (1990) that contralateral WBN can suppress DPOAEs in anesthetized guinea pigs. Furthermore, results suggest that this efferent control of the cochlear mechanical response can either be mediated by both nicotinic and muscarinic cholinergic receptors, or that a single receptor with as yet undescribed structure and pharmacology mediates effects seen." @default.
- W2003758319 created "2016-06-24" @default.
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- W2003758319 date "1993-06-01" @default.
- W2003758319 modified "2023-09-24" @default.
- W2003758319 title "Contralateral sound suppresses distortion product otoacoustic emissions through cholinergic mechanisms" @default.
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- W2003758319 doi "https://doi.org/10.1016/0378-5955(93)90068-c" @default.
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