Behavioral studies on concurrent vowels with shorter duration (50 ms) show that overall identification scores across fundamental frequency (F0) differences are reduced when compared to longer duration (200 ms). In this current study, we investigated the effect of shorter durations on concurrent vowel scores using the temporal responses of an auditory-nerve model (Zilany et al., 2014) with a modified version of the Meddis and Hewitt (1992) F0-guided vowel segregation algorithm. The F0 representations of 50 ms vowel pairs were reduced but could not fully account for reduced identification, suggesting a limited ability to avail an F0-guided vowel segregation cue. Thus, by limiting only this cue in the segregation algorithm for 200 ms, the model was qualitatively successful in capturing lower scores across F0 differences for 50 ms. This differential ability to utilize an F0-guided segregation cue might contribute to a variable F0 benefit across normal-hearing listeners. The model also predicted an improvement in identification scores of the second vowel of the pair, when the duration was increased from 50 ms to 200 ms. These model predictions suggest that the inability to utilize an F0-guided segregation cue at shorter durations can account for reduced concurrent vowel identification scores across F0 differences.

对持续时间较短（50 ms）的并发元音的行为研究表明，与持续时间较长（200 ms）相比，跨越基本频率（F0）差异的总体识别分数会降低。在当前的研究中，我们使用听觉神经模型的时间响应（Zilany等人，2014）和经过改进的Meddis and Hewitt（1992）F0指导的元音，研究了较短持续时间对并发元音成绩的影响。隔离算法。50 ms元音对的F0表示减少了，但不能完全说明减少的识别，这表明利用F0指导的元音分离提示的能力有限。因此，通过在隔离算法中仅将此提示限制200 ms，该模型在质量上成功地捕获了50 ms的F0差异中的较低分数。利用F0引导的隔离提示的这种差异能力可能会导致正常听力的听众产生不同的F0收益。当持续时间从50毫秒增加到200毫秒时，该模型还预测该对第二个元音的识别分数会有所提高。这些模型预测表明，在较短的持续时间内无法利用F0指导的隔离提示可以解决F0差异所导致的同时元音识别分数降低的问题。