遗忘型轻度认知损害患者记忆错误的神经心理学分析

摘要

Objective To explore the profile of false memory in aMCI ( amnesia mild cognitive impairment) and to elucidate the neuropsychological mechanism of false memory. Methods False memory provoked by pictures and feeling-of-knowing (FOK) test in episodic memory (EM) were conducted in 25 aMCI patients at our hospital from October 2009 to May 2010. And 25 age and education level-matched healthy patients were recruited into the healthy control (HC) group. Results As compared with HC group,the rate of false memory was higher in the aMCI group. The rate of false memory in recall stage was 26% ±7% and that of questionnaire stage 28% ± 12%. And the difference between two group was significant (t = 14. 437, 7. 597, P ＜0. 05). The FOK-EM of correct judgment and false recognition in the aMCI group (41% ± 10% ) was higher than the HC group. And the difference was significant (t =4. 207, P ＜0. 05).The rates of false memory in recall and questionnaire stages were positively correlated with FOK-EM in aMCI group(r = 0. 563, 0. 705, P ＜ 0. 01 ). Conclusion The aMCI patients tend to have more false memory provoked by pictures. The deficit of memory monitoring in aMCI may be the foundation of false memory.%目的 探讨遗忘型轻度认知损害(aMCI)患者记忆错误的认知神经心理学特征,了解aMCI患者记忆错误的神经心理学机制.方法 采用图片诱发情景记忆的记忆错误和知道感判断(feeling-of-knowing,FOK)的神经心理学测试方法,分别对25例来自2009年10月至2010年5月期间在安徽医科大学第一附属医院就诊的aMCI患者以及年龄、教育程度相匹配25名健康老年人进行测试.结果 与健康对照组相比,aMCI组故事编码和回忆阶段的记忆错误率(26%±7%)、问卷阶段的记忆错误发生率(28%±12%)和FOK-EM的正确判断/错误再认成绩(即高估)(41%±10%)均较高,差异有统计学意义(分别为t=14.437、7.597、4.207,P＜0.05),且故事编码和回忆阶段的记忆错误率、问卷阶段的记忆错误发生率与FOK-EM的正确判断/错误再认成绩均呈正相关(分别为r=0.563、0.705,P＜0.01).结论 aMCI组的图片诱发的记忆错误较健康对照组高,aMCI患者记忆错误的产生可能与其记忆监测障碍(高估)有关.