调制噪声中的间隙检测：跨频率促进与干扰。
Gap detection in modulated noise: across-frequency facilitation and interference.
作者信息
Grose John H, Buss Emily, Hall Joseph W
机构信息
Department of Otolaryngology-Head & Neck Surgery, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7070, USA.
出版信息
J Acoust Soc Am. 2008 Feb;123(2):998-1007. doi: 10.1121/1.2828058.
This study tested the hypothesis that a detection advantage for gaps in comodulated noise relative to random noise can be demonstrated in conditions of continuous noise and salient envelope fluctuations. Experiment 1 used five 25-Hz-wide bands of Gaussian noise, low-fluctuation noise, and a noise with increased salience of the inherent fluctuations (staccato noise). The bands were centered at 444, 667, 1000, 1500, and 2250 Hz, with the gap signal always inserted in the 1000-Hz band. Results indicated that a gap detection advantage existed in continuous comodulated noise only for Gaussian and staccato noise. Experiment 2 demonstrated that the advantage did not exist for gated presentation. This experiment also showed that the advantage bore some similarity to comodulation masking release. However, differences were also noted in terms of the effects of the number of flanking bands and the absence of a detection advantage in gated conditions. The detrimental effect of a gated flanking band was less pronounced for a comodulated band than for a random band. This study indicates that, under some conditions, a detection advantage for gaps carried by a narrow band of noise can occur in the presence of comodulated flanking bands of noise.
本研究检验了这样一个假设
在连续噪声和显著包络波动的条件下，相对于随机噪声，可证明在共调制噪声中对间隙的检测具有优势。实验1使用了五个25赫兹宽的高斯噪声带、低波动噪声以及固有波动显著性增加的噪声（断奏噪声）。这些频段的中心频率分别为444、667、1000、1500和2250赫兹，间隙信号始终插入1000赫兹频段。结果表明，仅在高斯噪声和断奏噪声的连续共调制噪声中存在间隙检测优势。实验2表明，门控呈现不存在这种优势。该实验还表明，这种优势与共调制掩蔽释放有一些相似之处。然而，在侧翼频段数量的影响以及门控条件下不存在检测优势方面也发现了差异。对于共调制频段，门控侧翼频段的有害影响比对随机频段的影响要小。本研究表明，在某些条件下，在存在共调制噪声侧翼频段的情况下，窄带噪声携带的间隙可能存在检测优势。
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