Pepler Anna, Lewis Kathryn, Munro Kevin J
a School of Psychological Sciences , University of Manchester , UK and.
b Audiology Department , University Hospitals South Manchester NHS Foundation Trust , Manchester , UK.
Int J Audiol. 2016;55(1):20-9. doi: 10.3109/14992027.2015.1074294. Epub 2015 Oct 13.
Cochlear dead regions (DR) are common in adult hearing-aid users, but are usually restricted to high frequencies. The aim was to determine the benefit of high-frequency amplification for ears with and without high-frequency DRs.
Participants were fitted with the study hearing aid and tested under four conditions: unfiltered (NAL-NL2 prescription), and low-pass filtered at 1.5, 2, and 3 kHz. VCV stimuli were presented at 65 dB (A) in quiet and in 20-talker babble at a signal-to-babble ratio of 0 dB.
Experienced adult hearing-aid users: one group of 18 with a DR edge frequency above 1.5 kHz, and a group of 18 matched controls.
Overall performance was best in the unfiltered condition. There was no significant difference in mean performance between the two groups when tested in quiet. However, the DR group obtained less benefit from high-frequency amplification when tested in babble: the mean difference between the unfiltered and 3-kHz filtered condition was 6% and 13% for the DR group and controls, respectively.
In adults with a moderate hearing loss and a restricted DR, speech recognition was always best in the unfiltered condition, although mean performance in babble was lower for the DR group.
耳蜗死区（DR）在成年助听器使用者中很常见，但通常局限于高频。本研究旨在确定高频放大对存在和不存在高频DR的耳朵的益处。
为参与者佩戴研究用助听器，并在四种条件下进行测试：未滤波（NAL-NL2处方），以及在1.5、2和3千赫处进行低通滤波。在安静环境中以65分贝（A）呈现VCV刺激，并在20人嘈杂环境中以0分贝的信号-嘈杂比呈现。
有经验的成年助听器使用者：一组18人，其DR边缘频率高于1.5千赫，另一组18人作为匹配对照。
总体表现以未滤波条件下最佳。在安静环境中测试时，两组的平均表现无显著差异。然而，在嘈杂环境中测试时，DR组从高频放大中获得的益处较少：DR组和对照组在未滤波和3千赫滤波条件下的平均差异分别为6%和13%。
在患有中度听力损失且存在局限DR的成年人中，尽管DR组在嘈杂环境中的平均表现较低，但言语识别始终以未滤波条件下最佳。
