摘要
背景:阿尔茨海默病(AD)是一种破坏大脑信息共享和记忆结合功能的断线综合症。这两个表型表达共享病理生理机制的程度仍然未知。 目的:揭示AD中整合性记忆障碍的电生理学相关性,为其前驱阶段的新记忆生物标志物。 方法:记录家族性AD(FAD)和健康对照100%患者的脑电图,并进行视觉短时记忆结合试验(VSTMBT)评估。我们将一种新的脑连接方法(加权符号互信息)应用于脑电数据。 结果:VSTMBT期间患者表现出明显的缺陷。在休息期间以及在正确的VSTM结合期间观察到脑连接性的减少,特别是在额部和后部区域。 VSTM绑定性能比中部地区增加了连接性。虽然在更晚期的FAD病例中发现连接性降低,但是在早期阶段出现了增加的大脑连接性。 89%的被评估患者发现了这种与任务相关的连通性的改变模式。 结论:在FAD的前驱阶段VSTM结合与改变的大脑连接模式相关联,从而证实前驱FAD中整合记忆缺陷和大脑信息共享受损之间的联系。尽管大脑连接性的显着丧失似乎是FAD晚期阶段的一个特征,但增加大脑连接性是其早期阶段的特征。根据最近关于AD最早的病理生理机制及其临床表现的建议,对这些发现进行了讨论。
关键词: 记忆结合,脑连通性,互信息,脑电图,生物标志物,PSEN1。
Current Alzheimer Research
Title:Brain Information Sharing During Visual Short-Term Memory Binding Yields a Memory Biomarker for Familial Alzheimer's Disease
Volume: 14 Issue: 12
关键词: 记忆结合,脑连通性,互信息,脑电图,生物标志物,PSEN1。
摘要: Background: Alzheimer's disease (AD) as a disconnection syndrome which disrupts both brain information sharing and memory binding functions. The extent to which these two phenotypic expressions share pathophysiological mechanisms remains unknown.
Objective: To unveil the electrophysiological correlates of integrative memory impairments in AD towards new memory biomarkers for its prodromal stages.
Methods: Patients with 100% risk of familial AD (FAD) and healthy controls underwent assessment with the Visual Short-Term Memory binding test (VSTMBT) while we recorded their EEG. We applied a novel brain connectivity method (Weighted Symbolic Mutual Information) to EEG data.
Results: Patients showed significant deficits during the VSTMBT. A reduction of brain connectivity was observed during resting as well as during correct VSTM binding, particularly over frontal and posterior regions. An increase of connectivity was found during VSTM binding performance over central regions. While decreased connectivity was found in cases in more advanced stages of FAD, increased brain connectivity appeared in cases in earlier stages. Such altered patterns of task-related connectivity were found in 89% of the assessed patients.
Conclusions: VSTM binding in the prodromal stages of FAD are associated to altered patterns of brain connectivity thus confirming the link between integrative memory deficits and impaired brain information sharing in prodromal FAD. While significant loss of brain connectivity seems to be a feature of the advanced stages of FAD increased brain connectivity characterizes its earlier stages. These findings are discussed in the light of recent proposals about the earliest pathophysiological mechanisms of AD and their clinical expression.
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Brain Information Sharing During Visual Short-Term Memory Binding Yields a Memory Biomarker for Familial Alzheimer's Disease, Current Alzheimer Research 2017; 14 (12) . https://dx.doi.org/10.2174/1567205014666170614163316
DOI https://dx.doi.org/10.2174/1567205014666170614163316 |
Print ISSN 1567-2050 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5828 |
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Neuroinflammation is an invariable hallmark of chronic and acute neurodegenerative disorders and has long been considered a potential drug target for Alzheimer?s disease (AD) and dementia. Significant evidence of inflammatory processes as a feature of AD is provided by the presence of inflammatory markers in plasma, CSF and postmortem brain ...read more
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