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Random local temporal structure of category fluency responses

机译：类别流畅度响应的随机局部时态结构

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摘要

The Category Fluency Test (CFT) provides a sensitive measurement of cognitive capabilities in humans related to retrieval from semantic memory. In particular, it is widely used to assess progress of cog nitive impairment in patients with dementia. Previous research shows that, in the first approximation, the intensity of tested individuals' responses within a stan dard 60-s test period decays exponentially with time, with faster decay rates for more cognitively impaired patients. Such decay rate can then be viewed as a global (macro) diagnostic parameter of each test. In the present paper we focus on the statistical properties of the properly de-trended time intervals between consec utive responses (inter-call times) in the Category Flu ency Test. In a sense, those properties reflect the local (micro) structure of the response generation process. We find that a good approximation for the distribution of the de-trended inter-call times is provided by the Weibull Distribution, a probability distribution that appears naturally in this context as a distribution of a minimum of independent random quantities and is the standard tool in industrial reliability theory. This insight leads us to a new interpretation of the concept of "navigating a semantic space" via patient responses.
机译：类别流利度测试（CFT）提供了人类对与从语义记忆中检索有关的认知能力的敏感度量。特别是，它被广泛用于评估痴呆患者认知功能障碍的进展。先前的研究表明，在第一个近似值中，在标准的60 s测试期内，被测人的反应强度随时间呈指数衰减，对于认知能力较弱的患者，衰减速度更快。然后可以将这种衰减率视为每个测试的全局（宏观）诊断参数。在本文中，我们重点关注类别流畅性测试中连续响应之间的适当下降趋势时间间隔（通话时间）的统计属性。从某种意义上说，这些属性反映了响应生成过程的局部（微观）结构。我们发现，Weibull分布提供了去趋势间通话时间分布的良好近似值，这种概率分布在这种情况下自然以最小的独立随机量分布出现，并且是标准的工具。工业可靠性理论。这种见解使我们通过患者的反应对“导航语义空间”的概念有了新的解释。

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  • 来源
    《Journal of Computational Neuroscience》 |2012年第2期|p.213-231|共19页
  • 作者

    David J. Meyer; Jason Messer; Tanya Singh; Peter J. Thomas; Wojbor A. Woyczynski; Jeffrey Kaye; Alan J. Lerner;

  • 作者单位

    Case Western Reserve University, 11900 Euclid Avenue,Cleveland, OH 44106, USA;

    Case Western Reserve University, 11900 Euclid Avenue,Cleveland, OH 44106, USA;

    Case Western Reserve University, 11900 Euclid Avenue,Cleveland, OH 44106, USA;

    Departments of Mathematics, Biology and Cognitive Science, Case Western Reserve University, 11900 Euclid Avenue, Cleveland, OH 44106, USA,Department of Neuroscience, Oberlin College, Oberlin,OH 44074, USA;

    Department of Statistics and Center for Stochastic and Chaotic Processes in Science and Technology,Case Western Reserve University, 11900 Euclid Avenue,Cleveland, OH 44106, USA;

    Departments of Neurology and Biomedical Engineering,Oregon Health and Science University, Portland,OR 97239, USA,Portland Veterans Affairs Medical Center, Portland,OR 97239, USA;

    Department of Neurology, Case Medical Center,Case Western Reserve University, 11900 Euclid Avenue,Cleveland, OH 44106, USA;

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  • 正文语种 eng
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  • 关键词

    category fluency test; semantic memory; cognitive impairment; alzheimer's disease; statistical temporal structure; weibull distribution; inter response times;

    机译：类别流利度测试;语义记忆;认知障碍;阿尔茨海默氏病;统计时间结构;威布尔分布交互时间;

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