Grose J H, Hall J W
University of North Carolina at Chapel Hill, Division of Otolaryngology 27599-7070.
J Speech Hear Res. 1994 Jun;37(3):680-6. doi: 10.1044/jshr.3703.680.
This study compared Modulation Detection Interference (MDI) in listeners with cochlear hearing loss and in listeners with normal hearing. The study was motivated by questions of temporal resolution in the listeners with cochlear hearing loss as well as by their general difficulty in monitoring target sounds in the presence of competing background noise. The first experiment was similar to the MDI paradigm of Yost and Sheft (1989) and showed an equivalence in performance between the two groups of listeners: MDI brought about by an interfering tone comodulated with the target tone at 10 Hz was about 11 dB in both groups. There was also no difference in MDI magnitude when the modulation rate of the interferer changed to 25 Hz, indicating a lack of tuning to differential modulation rate in the gated paradigm employed here. The second experiment was analogous in concept to the measurement of a psychophysical tuning curve; the depth of modulation of the interfering carrier was adjusted to just interfere with the detection of a suprathreshold degree of modulation on the target carrier. The listeners with cochlear hearing loss performed quite similarly to the normal group, and the general lack of a frequency effect for the carrier tones suggested that MDI was relatively insensitive to presumed differences in auditory filter bandwidth between listeners. Because the basis of MDI has been hypothesized to be the fusion of the interfering tone with the target tone, the results of this study suggest that the auditory grouping factors presumed to underlie MDI are intact in listeners with hearing loss of cochlear origin.
本研究比较了患有耳蜗性听力损失的听众和听力正常的听众的调制检测干扰（MDI）情况。该研究的动机源于对患有耳蜗性听力损失的听众的时间分辨率问题，以及他们在存在竞争性背景噪声时监测目标声音的普遍困难。第一个实验类似于约斯特和谢夫特（1989年）的MDI范式，结果显示两组听众在表现上相当：由与目标音在10赫兹处共调制的干扰音引起的MDI在两组中均约为11分贝。当干扰音的调制率变为25赫兹时，MDI幅度也没有差异，这表明在此采用的门控范式中缺乏对差分调制率的调谐。第二个实验在概念上类似于心理物理调谐曲线的测量；调整干扰载波的调制深度，使其刚好干扰目标载波上超阈值调制程度的检测。患有耳蜗性听力损失的听众的表现与正常组非常相似，并且载波音调普遍缺乏频率效应，这表明MDI对听众之间假定的听觉滤波器带宽差异相对不敏感。由于MDI的基础被假设为干扰音与目标音的融合，本研究结果表明，假定为MDI基础的听觉分组因素在患有耳蜗性听力损失的听众中是完整的。
