McFadden D
J Acoust Soc Am. 1987 May;81(5):1519-27. doi: 10.1121/1.394504.
In a variant of the standard paradigm employed to study comodulation masking release (CMR), a narrow noise band was used as a signal in the presence of "cue" bands which had either the same or different temporal envelopes. The number of cue bands present ranged from zero to four; when there were two or four cue bands, they were either all presented at the same overall level or the spectral profile was "scrambled" in a haphazard manner. Different noise samples were presented within and across trials. The result was in the opposite direction from the standard CMR outcome; that is, better performance was obtained when the envelopes of the cue band(s) were uncorrelated with those of the signal band than when they were correlated. These comodulation detection differences (CDDs) ranged from a decibel or two up to 10-12 dB in different conditions, and were generally larger the more cue bands present. Standard CMR conditions, which were run as controls, revealed that the detectability of a tonal signal does not increase as the number of cue bands is increased from one to four-an outcome which differs from those obtained in profile analysis experiments. The data taken with the equal-level and the scrambled-level cues differed little in both the CDD and the CMR conditions. All noise bands were 100 Hz wide, and approximately 250 ms in duration. The signal band in CDD and the masker band in CMR were centered at 2500 Hz. The psychophysical procedure was two-interval forced choice.
在用于研究共调制掩蔽释放（CMR）的标准范式的一种变体中，在存在具有相同或不同时间包络的“提示”频段的情况下，使用窄噪声带作为信号。存在的提示频段数量从零到四个不等；当有两个或四个提示频段时，它们要么全部以相同的总体水平呈现，要么频谱分布以随机方式“打乱”。在不同试验中以及试验之间呈现不同的噪声样本。结果与标准CMR结果相反；也就是说，当提示频段的包络与信号频段的包络不相关时，比它们相关时获得了更好的性能。这些共调制检测差异（CDD）在不同条件下从一两个分贝到10 - 12分贝不等，并且通常存在的提示频段越多差异越大。作为对照运行的标准CMR条件表明，随着提示频段数量从一个增加到四个，音调信号的可检测性不会增加——这一结果与轮廓分析实验中获得的结果不同。在CDD和CMR条件下，使用等电平提示和打乱电平提示获得的数据差异不大。所有噪声带宽度为100 Hz，持续时间约为250 ms。CDD中的信号带和CMR中的掩蔽带以2500 Hz为中心。心理物理学程序是二间隔强迫选择。
