کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4356389 1615677 2006 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dead regions in the cochlea and enhancement of frequency discrimination: Effects of audiogram slope, unilateral versus bilateral loss, and hearing-aid use
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Dead regions in the cochlea and enhancement of frequency discrimination: Effects of audiogram slope, unilateral versus bilateral loss, and hearing-aid use
چکیده انگلیسی
Following a restricted lesion of the cochlea, which produces a “dead region” (DR), animal experiments have revealed an increase in the cortical representation of frequencies just below the edge frequency (fe) of the DR. This may result in improved difference limens for frequency (DLFs) just below fe. In previous studies to assess this, the value of fe was not determined precisely. We measured DLFs using human subjects with DRs for whom the values of fe had been determined precisely using psychophysical tuning curves. To prevent use of loudness cues, stimuli for the measurement of DLFs had a mean level falling along an equal-loudness contour and levels were roved over a 12-dB range. DLFs were measured for thirteen subjects with a DR in at least one ear. Almost all subjects with bilateral hearing loss exhibited enhanced DLFs near fe, consistent with cortical reorganisation. This occurred for subjects whose audiograms had both steep and shallow slopes, regardless of hearing aid use, and for two subjects with low-frequency DRs. One subject with a high-frequency DR in one ear and good hearing in the other ear showed an enhanced DLF in her better ear.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hearing Research - Volume 222, Issues 1–2, December 2006, Pages 1-15
نویسندگان
, ,