Examining speech motor planning difficulties in apraxia of speech and aphasia via the sequential production of phonetically similar words.
Examining speech motor planning difficulties in apraxia of speech and aphasia via the sequential production of phonetically similar words.
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DOI：
10.1080/02643294.2020.1847059
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发表时间：
2021-03
影响因子：
3.4
通讯作者：
Forster KI
中科院分区：
文献类型：
--
作者：
Mailend ML;Maas E;Beeson PM;Story BH;Forster KI
本研究通过测试两个相互竞争的假设来调查言语失用症 (AOS) 的根本性质。缓冲能力减少假说认为，患有 AOS 的人一次只能计划一个音节的讲话。程序检索缺陷假说指出，面对其他同时激活的程序的竞争，选择一个运动程序是很困难的。患有 AOS 和失语症、无 AOS 失语症和未受损控制的说话者被要求准备并保持两个单词的发音，直到发出信号提示进行口头响应。目标词之间的语音相似性被操纵。与两个相同单词相比，具有 AOS 的说话者在两个相似单词的条件下反应时间更长。对照组和失语症组没有表现出这种效果。这些结果表明，当多个运动程序同时激活时，具有 AOS 的说话者需要额外的处理时间来检索目标词。
This study investigated the underlying nature of apraxia of speech (AOS) by testing two competing hypotheses. The Reduced Buffer Capacity Hypothesis argues that people with AOS can plan speech only one syllable at a time. The Program Retrieval Deficit Hypothesis states that selecting a motor program is difficult in face of competition from other simultaneously activated programs. Speakers with AOS and aphasia, aphasia without AOS, and unimpaired controls were asked to prepare and hold a two-word utterance until a go-signal prompted a spoken response. Phonetic similarity between target words was manipulated. Speakers with AOS had longer reaction times in conditions with two similar words compared to two identical words. The Control and the Aphasia group did not show this effect. These results suggest that speakers with AOS need additional processing time to retrieve target words when multiple motor programs are simultaneously activated.
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