Qualitative Analysis of Verbal Fluency Tasks in Alzheimerʼs Disease and Mild Cognitive Impairment

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  • アルツハイマー病と軽度認知障害における言語流暢性課題の質的検討

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Abstract

<p>  Objective: Previous studies have reported that verbal fluency task (VFT) scores are useful for cognitive evaluation in Alzheimerʼs disease (AD) and mild cognitive impairment (MCI) . Qualitative analysis of VFT responses may enable evaluation of cognitive dysfunction of search words and self-monitoring in AD and MCI. Furthermore, although search word function is evaluated on the basis of search word strategies these strategies have focused on English speakers and therefore are not suitable for analyzing responses of Japanese-speaking participants. This study examined characteristics of search words strategies and self-monitoring in Japanese-speaking patients with AD and MCI.<br>  Methods: Japanese-speaking patients with AD (n＝34) and MCI (n＝13) and normal controls NC (n＝18) participated in this study. The participants executed two kinds of VFT: semantic fluency tasks and letter fluency tasks. The total number of words, number of clusters, and number of switches among clusters were used as an index of search word dysfunction. The ratio of repetitive responses and ratio of questions to the tester concerning repetition of responses in both tasks were used to evaluate self-monitoring dysfunction.<br>  Result: In the semantic fluency task, the AD group produced fewer clusters and switches and more repetitions of responses and questions compared to the NCs. The MCI group produced fewer clusters and switches.<br>  Conclusions: In the semantic fluency task, cognitive function of search words declined in both the AD and MCI groups, while self-monitoring was impaired in AD patients only. The letter fluency task yielded no differences.</p>

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