Influences of length and syntactic complexity on the speech motor stability of the fluent speech of adults who stutter
Influences of length and syntactic complexity on the speech motor stability of the fluent speech of adults who stutter
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DOI：
10.1044/jslhr.4302.548
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发表时间：
2000-04-01
影响因子：
2.6
通讯作者：
Smith, A
中科院分区：
文献类型：
--
作者：
Kleinow, J;Smith, A
本研究的目的是调查话语长度和句法复杂性对口吃成年人言语运动或稳定性的影响。记录了 8 名口吃成年人和 8 名正常流利对照者的下唇运动。他们单独生成了一个目标短语（基线条件），并将相同的短语嵌入到增加长度和/或增加句法复杂性的话语中。时空指数（STI）用于量化目标短语多次重复时下唇运动的稳定性。结果表明：（a）在所有实验条件下，口吃的成年人表现出比正常流利的成年人更高的总体 STI 值，表明言语运动稳定性下降； (b) 正常流利的成年人的言语运动稳定性不受句法复杂性增加的影响，但口吃成年人的言语运动稳定性在刺激更复杂时下降； (c) 增加目标话语的长度（不增加句法复杂性）不会影响任一说话者群体的言语运动稳定性。这些结果表明，语言形成过程可能会影响言语产生过程，并且口吃成年人的言语运动系统可能特别容易受到产生更复杂话语所需的语言需求的影响。因此，目前的研究结果支持这样的假设：语言复杂性是导致口吃的言语运动稳定性特征破坏的一个因素。
The purpose of the present study was to investigate the impact of utterance length and syntactic complexity on the speech mot-or stability of adults who stutter Lower lip movement was recorded from 8 adults who stutter and 8 normally fluent controls. They produced a target phrase in isolation (baseline condition) and the same phrase embedded in utterances of increased length and/or increased syntactic complexity The spatiotemporal index (STI) was used to quantify the stability of lower lip movements across multiple repetitions of the target phrase. Results indicated: (a) Adults who stutter demonstrated higher overall STI values than normally fluent adults across all experimental conditions, indicating decreased speech motor stability; (b) the speech motor stability of normally fluent adults was not affected by increasing syntactic complexity, but the speech motor stability of adults who stutter decreased when the stimuli were more complex; (c) increasing the length of the target utterance (without increasing syntactic complexity) did not affect the speech motor stability of either speaker group These results indicate that language formulation processes may affect speech production processes and that the speech motor systems of adults who stutter may be especially susceptible to the linguistic demands required to produce a more complex utterance. The present findings, therefore, support the hypothesis that linguistic complexity is one Factor that contributes to the disruptions of speech motor stability characteristic of stuttering.