Verhey, JL;
Kordus, M;
Drga, V;
Yasin, I;
(2017)
Effect of efferent activation on binaural frequency selectivity.
Hearing Research
, 350
pp. 152-159.
10.1016/j.heares.2017.04.018.
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Abstract
Binaural notched-noise experiments indicate a reduced frequency selectivity of the binaural system compared to monaural processing. The present study investigates how auditory efferent activation (via the medial olivocochlear system) affects binaural frequency selectivity in normal-hearing listeners. Thresholds were measured for a 1-kHz signal embedded in a diotic notched-noise masker for various notch widths. The signal was either presented in phase (diotic) or in antiphase (dichotic), gated with the noise. Stimulus duration was 25 ms, in order to avoid efferent activation due to the masker or the signal. A bandpass-filtered noise precursor was presented prior to the masker and signal stimuli to activate the efferent system. The silent interval between the precursor and the masker-signal complex was 50 ms. For comparison, thresholds for detectability of the masked signal were also measured in a baseline condition without the precursor and, in addition, without the masker. On average, the results of the baseline condition indicate an effectively wider binaural filter, as expected. For both signal phases, the addition of the precursor results in effectively wider filters, which is in agreement with the hypothesis that cochlear gain is reduced due to the presence of the precursor.
| Type: | Article |
|---|---|
| Title: | Effect of efferent activation on binaural frequency selectivity |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.heares.2017.04.018 |
| Publisher version: | http://doi.org/10.1016/j.heares.2017.04.018 |
| Language: | English |
| Additional information: | © 2017 Elsevier B.V. All rights reserved. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Life Sciences & Biomedicine, Audiology & Speech-Language Pathology, Neurosciences, Otorhinolaryngology, Neurosciences & Neurology, Precursor, Efferent, MOC, Frequency selectivity, Binaural, DICHOTIC-LISTENING CONDITIONS, MASKING-LEVEL DIFFERENCES, AUDITORY FILTER SHAPES, HEARING-IMPAIRED SUBJECTS, NOTCHED-NOISE MASKING, SIGNAL-DURATION, OLIVOCOCHLEAR REFLEX, MASKER-BANDWIDTH, NERVE FIBERS, SUPPRESSION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1553390 |
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