Release from masking in cochlear-implant listeners and its relationship to spectro-temporal resolution
| Autor: | Naomi B. H. Croghan, Zachary M. Smith |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Masking (art)
Speech perception Acoustics and Ultrasonics Computer science Acoustics Speech recognition media_common.quotation_subject medicine.medical_treatment behavioral disciplines and activities Tone (musical instrument) Noise Arts and Humanities (miscellaneous) Temporal resolution Cochlear implant otorhinolaryngologic diseases medicine Contrast (vision) psychological phenomena and processes media_common |
| Zdroj: | The Journal of the Acoustical Society of America. 139:1990-1990 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.4949821 |
| Popis: | Release from masking is commonly observed in normal-hearing listeners when fluctuating interferers mask speech perception less than steady interferers at the same signal-to-noise ratio. In contrast, studies of cochlear-implant listeners have historically failed to find masking release with fluctuating maskers. Here, we provide new insights into the relationship between spectro-temporal resolution and release from masking in cochlear-implant and simulated cochlear-implant listeners. Varying degrees of current spread were simulated in normal-hearing listeners using a tone vocoder. Speech reception thresholds were measured with four different interferers: a tone complex, speech-shaped noise, four-talker babble, and a single competing talker. A dynamic spectral ripple detection test was conducted to measure psychophysical spectro-temporal resolution. Results show that overall speech perception was correlated with spectro-temporal ripple detection thresholds. However, some maskers were more sensitive to spectro-temporal resolution than others. Subjects in both groups demonstrated release from masking between the speech-shaped noise and the single competing talker conditions, and the degree of release varied with spectro-temporal ripple sensitivity. These findings shed new light on previous cochlear-implant results, suggesting that individual cochlear-implant listeners with high spectro-temporal resolution may benefit from the temporal fluctuations in certain noise types. |
| Databáze: | OpenAIRE |
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