2026-06-28T20:16:12Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1308492026-01-23T01:16:55Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author López Ramos, David author López Bascuas, Luis Enrique author Eustaquio Martín, María Almudena author López Poveda, Enrique A. 2026-01-22T22:04:03Z 2026-01-22T22:04:03Z 2024-09-08 López-Ramos, D., López-Bascuas, L. E., Eustaquio-Martín, A., y Lopez-Poveda, E. A. (2024). Effects of ipsilateral, contralateral, and bilateral noise precursors on psychoacoustical tuning curves in humans. Hearing Research, 453, 109111. https://doi.org/10.1016/j.heares.2024.109111 0378-5955 10.1016/j.heares.2024.109111 https://hdl.handle.net/20.500.14352/130849 https://doi.org/10.1016/j.heares.2024.109111 Cochlear tuning and hence auditory frequency selectivity are thought to change in noisy environments by activation of the medial olivocochlear reflex (MOCR). In humans, auditory frequency selectivity is often assessed using psychoacoustical tuning curves (PTCs), a plot of the level required for pure-tone maskers to just mask a fixed-level pure-tone probe as a function of masker frequency. Sometimes, however, the stimuli used to measure a PTC are long enough that they can activate the MOCR by themselves and thus affect the PTC. Here, PTCs for probe frequencies of 500 Hz and 4 kHz were measured in forward masking using short maskers (30 ms) and probes (10 ms) to minimize the activation of the MOCR by the maskers or the probes. PTCs were also measured in the presence of long (300 ms) ipsilateral, contralateral, and bilateral broadband noise precursors to investigate the effect of the ipsilateral, contralateral, and bilateral MOCR on PTC tuning. Four listeners with normal hearing participated in the experiments. At 500 Hz, ipsilateral and bilateral precursors sharpened the PTCs by decreasing the thresholds for maskers with frequencies at or near the probe frequency with minimal effects on thresholds for maskers remote in frequency from the probe. At 4 kHz, by contrast, ipsilateral and bilateral precursors barely affected thresholds for maskers near the probe frequency but broadened PTCs by reducing thresholds for maskers far from the probe. Contralateral precursors barely affected PTCs. An existing computational model was used to interpret the results. The model suggested that despite the apparent differences, the pattern of results is consistent with the ipsilateral and bilateral MOCR inhibiting the cochlear gain similarly at the two probe frequencies and more strongly than the contralateral MOCR. eng Attribution-NonCommercial 4.0 International Effects of ipsilateral, contralateral, and bilateral noise precursors on psychoacoustical tuning curves in humans journal article 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URL https://docta.ucm.es/bitstreams/f3fa0cd0-9ab4-4148-8896-266fca9372ea/download File MD5 2c2450eb4f4f3ede1e11a7c1edc9fb54 2379154 application/pdf Precursors PTC Hearing Research.pdf