Green D M, Kidd G
J Acoust Soc Am. 1983 Apr;73(4):1260-5. doi: 10.1121/1.389274.
The discrimination of a change in the intensity of a component or components of a multitone complex is reported as a function of a number of experimental variables. In one experiment, changes in the shape of the spectrum were explored to determine which kinds of changes are more easily detected. Although different signal spectra produced different thresholds, the change in a single component produced the lowest threshold on an energy basis. Various binaural conditions were tested to determine if the shape or profile of the stimulus could be supplied by the ear opposite the one in which the signal was presented. Conditions where spectral contrasts were available to both ears simultaneously (diotic conditions) were much more sensitive than conditions where the spectral contrasts occured for opposite ears (dichotic conditions). Finally, the level of the component at the signal frequency was varied relative to the other, equal amplitude, components to form a "pedestal" upon which the signal was added. Detection of the signal was roughly the same for pedestal levels within about +/- 12 dB of the background except for conditions where masking was apparent.
对多音复合体中一个或多个成分强度变化的辨别被报告为多个实验变量的函数。在一项实验中，研究了频谱形状的变化，以确定哪种变化更容易被检测到。尽管不同的信号频谱产生了不同的阈值，但单个成分的变化在能量基础上产生了最低的阈值。测试了各种双耳条件，以确定刺激的形状或轮廓是否可以由与呈现信号的耳朵相对的耳朵提供。两只耳朵同时有频谱对比的条件（双耳条件）比频谱对比出现在对侧耳朵的条件（双耳分听条件）要敏感得多。最后，相对于其他等幅成分，改变信号频率处成分的电平，以形成一个添加信号的“基座”。除了掩蔽明显的情况外，对于背景电平约±12dB范围内的基座电平，信号检测大致相同。
