Stuart A, Phillips D P
Department of Psychology, Dalhousie University, Halifax, Canada.
Scand Audiol. 1997;26(2):112-6. doi: 10.3109/01050399709074983.
The effect of presentation level on word recognition performance-intensity functions in continuous and interrupted broadband noise and in quiet was explored. Normal-hearing participants were tested at 30 and 50 dB sensation levels (SLs). Performance-intensity functions in both noises were determined at signal-to-noise ratios (S/Ns) of 10, 5, 0, -5, -10, -15, and -20 dB. There was no effect of SL presentation on word recognition performance in quiet (p = 0.136). A significant main effect was observed for S/N in both continuous and interrupted broadband noise conditions (p < 0.0001). Performance increased with increases in S/N regardless of the competing noise condition. A significant main effect for SL presentation was only observed in the interrupted noise condition (p = 0.0019). That is, performance was higher for the 50 SL for the interrupted noise condition only. It is suggested that the observed difference in performance in interrupted noise at different SLs offers additional evidence for level-dependent, temporal masking phenomena.
研究了在连续和间断宽带噪声以及安静环境中，呈现水平对单词识别性能-强度函数的影响。正常听力的参与者在30和50分贝感觉级（SLs）下进行测试。在10、5、0、-5、-10、-15和-20分贝的信噪比（S/Ns）下确定两种噪声中的性能-强度函数。SL呈现对安静环境中的单词识别性能没有影响（p = 0.136）。在连续和间断宽带噪声条件下，均观察到S/N的显著主效应（p < 0.0001）。无论竞争噪声条件如何，性能都随着S/N的增加而提高。仅在间断噪声条件下观察到SL呈现的显著主效应（p = 0.0019）。也就是说，仅在间断噪声条件下，50 SL时的性能更高。研究表明，在不同SLs下间断噪声中观察到的性能差异为水平依赖的时间掩蔽现象提供了额外证据。
