The Japanese journal of neuropsychology

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ArticleTitle	Related and unrelated false recalls in a word recall task in patients with Alzheimer's disease: relationship to the performance on the Frontal Assessment Battery (FAB)
Language	J
AuthorList	Haruka Matsukawa¹⁾⁴⁾, Chisato Uchiyama²⁾, Takuya Sato²⁾, Toru Imamura¹⁾³⁾
Affiliation	¹⁾Department of Speech Therapy, School of Health Sciences, Niigata University of Health and Welfare ²⁾Division of Speech Therapy, Department of Rehabilitation, Niigata Rehabilitation Hospital ³⁾Department of Neurology, Niigata Rehabilitation Hospital ⁴⁾Present address: Division of Speech Therapy, Syodokai Minami Tohoku Hospital
Publication	Japanese Journal of Neuropsychology: 30 (3), 224-232, 2014
Received	Oct 18, 2013
Accepted	Apr 14, 2014
Abstract	Objective: To investigate the relationship of related and unrelated types of false recall to other cognitive test performances in patients with Alzheimer's disease (AD). Subjects: 183 patients who had a diagnosis of AD and underwent the Alzheimer's Disease Assessment Scale (ADAS) and the Frontal Assessment Battery (FAB) at our memory clinic. Methods: We collected the falsely-recalled words in the Word Recall task of the ADAS and classified them into two types: (1) related false recall, which consisted of the words either with the same semantic categories as one of the target words or with a letter in common with one of the target words, (2) unrelated false recall, which consisted of the other words. Two comparisons between the patient groups were conducted; 52 patients with related false recall versus 117 patients without false recall, and 24 patients with unrelated false recall versus 117 patients without false recall. Demographic, clinical and cognitive characteristics were compared between the groups with analyses of variance. Results: The scores on the Similarities in the FAB were worse in the patients with related false recall and the patients with unrelated false recall than in the patients without false recall. The scores on the Word Recognition in the ADAS were better in the patients with related false recall than in the patients without false recall. A post-hoc analysis of covariance showed that the significant difference of the scores on the Similarities was independence to that of the scores on the Word Recognition. Conclusions: Our study suggested that related and unrelated types of false recall in the Word Recall task of ADAS are associated with the worse score on the Similarities in the FAB. We supposed two possible reasons why the patients with worse scores on the task produced false recall: (1) words are falsely recalled due to impairment in the retrieval monitoring process for recall; and (2) words are falsely recalled due to disinhibition of the responses stimulated by words that were produced previously in the recall task.
Keywords	False memory, Alzheimer's Disease Assessment Scale (ADAS), Frontal Assessment Battery (FAB), related false recall, unrelated false recall