Florentine M
Department of Speech-Language Pathology and Audiology, Northeastern University, Boston, MA 02115.
Audiology. 1992;31(5):241-53.
Psychoacoustic tuning curves in simultaneous masking were measured in three groups: listeners with hearing impairment of primarily cochlear origin, normal listeners with equivalent-threshold masking (ETM) and normal listeners tested in the quiet. ETM was produced by presenting a continuous back-ground noise that was spectrally shaped to yield masked thresholds within 3 dB of each impaired listener's quiet thresholds. For the tuning curves, the level of a 50-Hz-wide noise band necessary to mask a 10-dB SL tone was measured for six masker frequencies. Results under ETM indicate that the shape of the tuning curve depends not only on masked threshold at the probe frequency but also on the spectral shape of the masker. Tuning curves are abnormally broad in some impaired listeners even when the effects of their elevated thresholds, audiometric configuration and altered intensity perception are taken into account by comparisons with normal listeners with ETM.
在同时掩蔽条件下，对三组人群测量了心理声学调谐曲线：主要为耳蜗性听力损失的听障者、具有等效阈值掩蔽（ETM）的正常听力者以及在安静环境中测试的正常听力者。通过呈现连续背景噪声来产生ETM，该背景噪声在频谱上进行了塑形，以使每个听障者的掩蔽阈值在其安静阈值的3分贝范围内。对于调谐曲线，针对六个掩蔽频率，测量了掩蔽10分贝感觉级（SL）纯音所需的50赫兹宽带噪声的水平。ETM条件下的结果表明，调谐曲线的形状不仅取决于探测频率处的掩蔽阈值，还取决于掩蔽声的频谱形状。即使通过与具有ETM的正常听力者进行比较，考虑到听障者阈值升高、听力图形态和强度感知改变的影响，一些听障者的调谐曲线仍异常宽阔。
