Yost W A, Dye R H, Sheft S
Parmly Hearing Institute, Loyola University of Chicago, Illinois 60626, USA.
J Acoust Soc Am. 1995 Jul;98(1):652-5. doi: 10.1121/1.413658.
The synthetic-analytic listening task (SALT) developed by Dye and colleagues [Dye et al., J. Acoust. Soc. Am. 96, 2720-2731 (1994)] was applied to a task in which an amplitude-modulated tonal carrier was presented as a target during the standard stimulus. The standard stimulus was followed by a test stimulus in which the target along with another amplitude-modulated carrier (the distractor) was presented. The listener determined if in the test stimulus, the target (which was presented along with the distractor) was higher or lower in modulation depth than when the target was presented alone as the standard stimulus. The target and distractor were either 1- or 4-kHz carriers modulated at one of ten depths of modulation during the test stimulus at modulation rates ranging from 4 to 64 Hz. SALT was used to estimate the relative weight listeners assigned to the target and distractor as a function of the difference between their modulation rates, both for target carrier frequencies above and for target carrier frequencies below the distractor carrier frequency. When the target and distractor were modulated at the same rate, the target and distractor weights were equal, indicating synthetic listening. When the target and distractor differed in modulation rate, the listener gave more weight to the target suggesting a form of analytic listening. The result demonstrate the applicability of SALT to studies of modulation and reinforce the claim that different spectral components modulated with the same modulation pattern are processed synthetically.
戴伊及其同事开发的合成分析听力任务（SALT）[戴伊等人，《美国声学学会杂志》96，2720 - 2731（1994）]被应用于一项任务，在该任务中，一个调幅音调载波在标准刺激期间作为目标呈现。标准刺激之后是一个测试刺激，其中目标与另一个调幅载波（干扰物）一起呈现。听众要确定在测试刺激中，与干扰物一起呈现的目标在调制深度上是高于还是低于目标单独作为标准刺激呈现时的调制深度。在测试刺激期间，目标和干扰物是1千赫或4千赫的载波，以十种调制深度之一进行调制，调制速率范围为4至64赫兹。SALT用于估计听众赋予目标和干扰物的相对权重，该权重是目标载波频率高于和低于干扰物载波频率时它们调制速率差异的函数。当目标和干扰物以相同速率调制时，目标和干扰物的权重相等，表明是合成听力。当目标和干扰物的调制速率不同时，听众会赋予目标更多权重，这表明是一种分析听力形式。结果证明了SALT在调制研究中的适用性，并强化了这样一种观点，即具有相同调制模式的不同频谱成分是被综合处理的。
