Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Cochlear compression between 500 and 8000 Hz in listeners with moderate sensorineural hearing loss.
AU - Lopez-Poveda, Enrique A.
AU - Plack, Christopher J.
AU - Meddis, Ray
AU - Blanco, Jose L.
PY - 2005/7
Y1 - 2005/7
N2 - Psychophysical estimates of basilar membrane (BM) responses suggest that normal-hearing (NH) listeners exhibit constant compression for tones at the characteristic frequency (CF) across the CF range from 250 to 8000 Hz. The frequency region over which compression occurs is broadest for low CFs. This study investigates the extent that these results differ for three hearing-impaired (HI) listeners with sensorineural hearing loss. Temporal masking curves (TMCs) were measured over a wide range of probe (500–8000 Hz) and masker frequencies (0.5–1.2 times the probe frequency). From these, estimated BM response functions were derived and compared with corresponding functions for NH listeners. Compressive responses for tones both at and below CF occur for the three HI ears across the CF range tested. The maximum amount of compression was uncorrelated with absolute threshold. It was close to normal for two of the three HI ears, but was either slightly (at CFs 1000 Hz) or considerably (at CFs 4000 Hz) reduced for the third ear. Results are interpreted in terms of the relative damage to inner and outer hair cells affecting each of the HI ears. Alternative interpretations for the results are also discussed, some of which cast doubts on the assumptions of the TMC-based method and other behavioral methods for estimating human BM compression.
AB - Psychophysical estimates of basilar membrane (BM) responses suggest that normal-hearing (NH) listeners exhibit constant compression for tones at the characteristic frequency (CF) across the CF range from 250 to 8000 Hz. The frequency region over which compression occurs is broadest for low CFs. This study investigates the extent that these results differ for three hearing-impaired (HI) listeners with sensorineural hearing loss. Temporal masking curves (TMCs) were measured over a wide range of probe (500–8000 Hz) and masker frequencies (0.5–1.2 times the probe frequency). From these, estimated BM response functions were derived and compared with corresponding functions for NH listeners. Compressive responses for tones both at and below CF occur for the three HI ears across the CF range tested. The maximum amount of compression was uncorrelated with absolute threshold. It was close to normal for two of the three HI ears, but was either slightly (at CFs 1000 Hz) or considerably (at CFs 4000 Hz) reduced for the third ear. Results are interpreted in terms of the relative damage to inner and outer hair cells affecting each of the HI ears. Alternative interpretations for the results are also discussed, some of which cast doubts on the assumptions of the TMC-based method and other behavioral methods for estimating human BM compression.
KW - Basilar membrane
KW - Cochlear compression
KW - Recovery from forward masking
KW - Hearing loss
KW - Inner hair cell
KW - Outer hair cell
U2 - 10.1016/j.heares.2005.03.015
DO - 10.1016/j.heares.2005.03.015
M3 - Journal article
VL - 205
SP - 172
EP - 183
JO - Hearing Research
JF - Hearing Research
SN - 0378-5955
IS - 1-2
ER -