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Impaired processing speed in categorical perception: Speech perception of children who stutter

机译：分类感知的处理速度受损：口吃儿童的语音感知

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There have been controversial debates across multiple disciplines regarding the underlying mechanism of developmental stuttering. Stuttering is often related to issues in the speech production system; however, the presence and extent of a speech perception deficit is less clear. This study aimed to investigate the speech perception of children who stutter (CWS) using the categorical perception paradigm to examine their ability to categorize different acoustic variations of speech sounds into the same or different phonemic categories. In this study, 15 CWS and 16 children who do not stutter (CWNS) completed identification and discrimination tasks involving acoustic variations of Cantonese speech sounds in three stimulus contexts: consonants (voice onset times, VOTs), lexical tones, and vowels. The results showed similar categorical perception performance in boundary position and width in the identification task and similar d' scores in the discrimination task between the CWS and CWNS groups. However, the reaction times (RTs) were slower in the CWS group compared with the CWNS group in both tasks. Moreover, the CWS group had slower RTs in identifying stimuli located across categorical boundaries compared with stimuli located away from categorical boundaries. Overall, the data implied that the phoneme representation evaluated in speech perception might be intact in CWS as revealed by similar patterns in categorical perception as those in CWNS. However, the CWS group had slower processing speeds during categorical perception, which may indicate an insufficiency in accessing the phonemic representations in a timely manner, especially when the acoustic stimuli were ambiguous.
机译：跨学科的发展口吃的潜在机制一直存在争议。口吃通常与语音制作系统中的问题有关。但是，语音感知缺陷的存在和程度尚不清楚。这项研究旨在调查口吃儿童的语音感知，使用分类感知范式检查他们将语音的不同声音变化分类为相同或不同音素类别的能力。在这项研究中，有15名CWS和16名没有口吃的儿童完成了识别和辨别任务，涉及在三种刺激环境中的广东话语音的声音变化：辅音（语音起音时间，VOT），词汇声调和元音。结果表明，在CWS和CWNS组之间，在识别任务中边界位置和宽度上的分类感知性能相似，在区分任务中的d'得分相似。但是，在两个任务中，CWS组的反应时间（RTs）均比CWNS组慢。此外，与远离类别边界的刺激相比，CWS组在识别跨越类别边界的刺激时具有较慢的RT。总体而言，数据暗示在语音感知中评估的音素表示在CWS中可能是完整的，如与CWNS中类似的类别感知模式所揭示。但是，CWS组在分类感知期间的处理速度较慢，这可能表明无法及时访问音素表示，尤其是在声音刺激含糊不清的情况下。

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