Effects of age and dementia on temporal cycles in spontaneous speech fluency.
Effects of age and dementia on temporal cycles in spontaneous speech fluency.
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DOI：
10.1016/j.jneuroling.2011.06.002
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发表时间：
2011-10
影响因子：
2
通讯作者：
Birnbaum, Angela K.
中科院分区：
文献类型：
--
作者：
Pakhomov, Serguei V. S.;Kaiser, Eden A.;Boley, Daniel L.;Marino, Susan E.;Knopman, David S.;Birnbaum, Angela K.
健康成人的自发性言语由流畅和迟疑两段交替组成，形成言语流畅度的时间循环。这些周期的规律性可能与语言计划和执行过程中大脑网络的功能有关。本文采用定量时间序列分析的方法研究了人类认知功能与言语产生时间周期之间的理论联系，以表征不同认知水平和认知衰退原因的成年人的时间周期的规律性和频率。我们比较了没有神经学诊断的成年人的自发言语，无论是年长的还是年轻的，与患有额颞叶变性(FTLD)的成年人的自发言语进行了比较。根据语音流畅度的功率谱计算出的两个时间周期频率(平均值和模式)被发现与受试者的年龄有关，而与痴呆症的诊断无关。周期性的两个衡量标准(g统计量和节律性指数)以及平均频率，在患有痴呆症和不患有痴呆症的成年人之间有所区别。我们的研究证实了自发言语中存在规则的时间周期，并表明由于痴呆症和衰老导致的认知功能下降以不同方式影响时间周期特征。
Spontaneous speech of healthy adults consists of alternating periods of fluent and hesitant segments, forming temporal cycles in speech fluency. The regularity of these cycles may be related to the functioning of brain networks during speech planning and execution. This paper investigates the theoretical link between human cognitive functioning and temporal cycles in speech production using a quantitative time series analysis to characterize the regularity and frequency of temporal cycles in adults with differing levels and etiology of cognitive decline. We compare spontaneous speech of adults without a neurological diagnosis, both older and younger, to that of adults with frontotemporal lobar degeneration (FTLD). Two measures of temporal cycle frequency (mean and mode) calculated from the power spectrum of speech fluency represented as a time series were found to be associated with subjects’ age, regardless of diagnosis of dementia. Two measures of periodicity (g-statistic and rhythmicity-index), as well as mean frequency, differentiated between adults with and without dementia. Our study confirms the presence of regular temporal cycles in spontaneous speech and suggests that temporal cycle characteristics are affected in different ways by declines in cognitive functioning due to dementia and aging.
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影响因子：
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