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Título
Adaptation to noise in amplitude modulation detection without the medial olivocochlear reflex
Autor(es)
Materia
Cochlear implant
Temporal effect
Noise adaptation
Sound envelope
Dynamic range adaptation
Modulation detection interference
Clasificación UNESCO
3213.08 Neurocirugía
Fecha de publicación
2019
Resumen
[EN]The detection of amplitude modulation (AM) in quiet or in noise improves when the AM carrier is preceded by noise, an effect that has been attributed to the medial olivocochlear reflex (MOCR). We investigate whether this improvement can occur without the MOCR by measuring AM sensitivity for cochlear implant (CI) users, whose MOCR effects are circumvented as a result of the electrical stimulation provided by the CI. AM detection thresholds were measured monaurally for short (50 ms) AM probes presented at the onset (early condition) or delayed by 300 ms (late condition) from the onset of a broadband noise. The noise was presented ipsilaterally, contralaterally and bilaterally to the test ear. Stimuli were processed through an experimental, time-invariant sound processing strategy. On average, thresholds were 4 dB better in the late than in the early condition and the size of the improvement was similar for the three noise lateralities.
URI
ISSN
0378-5955
DOI
10.1016/j.heares.2019.03.017
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