Pure-tone increment detection in harmonic and inharmonic backgrounds.
Pure-tone increment detection in harmonic and inharmonic backgrounds.
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谐波和非谐波背景中的纯音增量检测。
DOI：
10.1121/1.399958
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
C. Turner
中科院分区：
文献类型：
--
作者：
Carol C. Henn;C. Turner
本研究调查的影响，增加的数量和频率范围的背景成分后，检测的增量的中心分量的强度。以前的研究[例如，绿色等人，J. Acoust.美国社会75，1163-1167（1984）]已经证明，对于由频率间隔的纯音分量组成的背景刺激，随着背景分量的数量增加，用于检测中心分量的增量的阈值降低。本研究使用谐波间隔以及谐波间隔的背景来研究这种效应，因为许多自然声音，包括有声语音，都由谐波间隔的分量组成。两种条件下采用两种类型的背景，固定水平和流动水平的试验。组的结果显示，一个小的阈值下降，增加组件的数量只为固定的水平，几何间隔的背景。在其他三种条件下，包括与绿色等人（1984）使用的相同的游动水平、空间间隔的背景下，没有观察到阈值的降低。目前的结果表明，信号阈值的降低，随着背景成分的数量增加，只存在于有限的条件下，这是一个非常个别的现象。目前的研究结果还表明，这种效果不会发生谐波间隔复杂，如最自然的声音，包括有声语音。
The present study investigated the effect of increasing the number and frequency range of background components upon the detection of an increment to the intensity of the center component. Previous studies [e.g., Green et al., J. Acoust. Soc. Am. 75, 1163-1167 (1984)] have demonstrated that, for background stimuli consisting of logarithmically spaced pure-tone components, as the number of background components is increased, the threshold for detection of an increment to the center component is decreased. The present study investigated this effect using harmonically spaced, as well as logarithmically spaced, backgrounds, because many natural sounds, including voiced speech sounds, consist of harmonically spaced components. Two conditions were employed for both types of backgrounds, fixed-level and roving-level within a trial. Group results revealed a small decrease in threshold with increasing number of components only for the fixed-level, logarithmically spaced backgrounds. No decrease in threshold was observed for the other three conditions, including the roving-level, logarithmically spaced backgrounds which were the same as those used by Green et al. (1984). The present results suggest that the decrease in signal threshold with increasing number of background components exists only under limited conditions and that it is a highly individual phenomenon. The present results also suggest that the effect does not occur for harmonically spaced complexes such as most natural sounds including voiced speech.