Grose J H, Hall J W
University of North Carolina, Division of Otolaryngology, Chapel Hill 27599-7070.
J Acoust Soc Am. 1990 Mar;87(3):1272-7. doi: 10.1121/1.399532.
The aim of this study was to examine whether the scheme of across-frequency comparison underlying comodulation masking release (CMR) is sensitive to the placement of the signal in the array of comodulating bands. This was addressed using the paradigm of signal-frequency uncertainty. In the first experiment, maskers were constructed of linearly spaced sinusoidally amplitude-modulated tones, and the signal was a pure tone presented at one of five frequencies. A small uncertainty effect was observed for the noncomodulated masker, but no significant effect was observed for the comodulated masker. In the second experiment, the maskers were constructed of logarithmically spaced noise bands, and the signal was a pure tone presented at one of seven frequencies. In these conditions, an uncertainty effect was observed in both noncomodulated and comodulated maskers, which was larger than that observed in experiment 1. The results were interpreted as indicating that the mechanism of across-frequency comparison underlying CMR is sensitive to signal location.
本研究的目的是检验共调制掩蔽释放（CMR）背后的跨频率比较方案是否对信号在共调制频段阵列中的位置敏感。这一问题通过信号频率不确定性范式来解决。在第一个实验中，掩蔽音由线性间隔的正弦幅度调制音构成，信号是在五个频率之一呈现的纯音。对于未调制的掩蔽音观察到了较小的不确定性效应，但对于已调制的掩蔽音未观察到显著效应。在第二个实验中，掩蔽音由对数间隔的噪声带构成，信号是在七个频率之一呈现的纯音。在这些条件下，在未调制和已调制的掩蔽音中均观察到了不确定性效应，且该效应大于在实验1中观察到的效应。结果被解释为表明CMR背后的跨频率比较机制对信号位置敏感。
