Beskrivelse
BACKGROUND AND AIMS: Hearing aids provide level-dependent gain to improve speech audibility. While more audibility typically leads to better speech intelligibility at low levels, several studies have found that at high levels increasing the presentation level leads to decreased intelligibility. This phenomenon, termed ’rollover‘, has been observed in listeners with normal and elevated audiometric thresholds.In an earlier study, we presented linearly amplified speech in quiet at above-conversational levels via headphones to a group of 37 hearing-impaired listeners and observed rollover in many cases. Here, we investigated rollover under more ecologically valid conditions.
METHODS: A group of adults with sensorineural hearing loss participated. A wearable hearing-aid simulator and two clinically established, non-linear fitting strategies – NAL-NL1 and NAL-NL2 – were used. Speech intelligibility was assessed in the presence of background noise using a free-field setup.
RESULTS AND CONCLUSIONS: We hypothesize that NAL-NL2, which prescribes less gain and thus more compression at high levels than NAL-NL1, will lead to less rollover at group level. Individual data will be compared to predictions based on the Speech Intelligibility Index. We expect that this will further our understanding of the mechanisms behind aided speech recognition at higher levels.
| Periode | 11. sep. 2023 → 15. sep. 2023 |
|---|---|
| Begivenhedstitel | Forum Acusticum 2023: 10th Convention of the European Acoustics Association |
| Begivenhedstype | Konference |
| Placering | Torino, ItalienVis på kort |
| Grad af anerkendelse | International |