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相关概念视频

Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

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Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
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Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
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Dementia l: Introduction01:22

Dementia l: Introduction

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Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
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相关实验视频

Updated: May 5, 2026

A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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使用多层大脑网络分析,将健康衰老和语义性痴呆期间的结构和功能变化联系起来.

Gwendolyn Jauny1, Marine Le Petit2, Shailendra Segobin1

  • 1Normandie Univ, UNICAEN, PSL Université Paris, EPHE, Inserm, U1077, CHU de Caen, Centre Cyceron, Neuropsychologie et Imagerie de la Mémoire Humaine, Caen, France.

Cortex; a journal devoted to the study of the nervous system and behavior
|December 28, 2024
PubMed
概括

健康老龄化显示了大脑网络模式的改变,语义性痴呆症患者的明显变化. 这些大脑网络的转变与健康衰老和疾病中的认知功能变化相关.

关键词:
大脑的连接性 大脑的连接性认知 认知是一种认知.健康的衰老 健康的衰老多层网络分析多层网络分析.语义性痴呆症是一种痴呆症.

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科学领域:

  • 神经科学是一个神经科学.
  • 认知科学 认知科学
  • 医疗成像医学成像

背景情况:

  • 健康老龄化涉及广泛的大脑变化,与语义性痴呆症等病理中的焦点病变不同.
  • 结构性大脑完整性的变化会影响功能性大脑网络的动态.
  • 了解这些网络变化是表征衰老和疾病中的认知功能的关键.

研究的目的:

  • 研究年轻成年人,健康的老年人和语义痴呆症患者之间的多层大脑网络分析的差异.
  • 检查结构和功能大脑连接模式与认知表现之间的关联.
  • 区分与正常衰老和神经退行性病理相关的网络变化.

主要方法:

  • 多层脑网络分析应用于扩散MRI (DWI) 和功能MRI (fMRI) 数据.
  • 网络连接模式的比较和在年轻健康,年长健康和语义痴呆症组中的聚类.
  • 网络指标和认知性能指标之间的相关性分析.

主要成果:

  • 与年轻人相比,健康的老年人表现出结构功能连接相似性下降和额头网络聚类增加.
  • 语义性痴呆症患者表现出增加的结构功能连接相似性和temporo-parietal网络集群.
  • 连接性变化与认知表现相关,在某些方面保持,在其他方面下降.

结论:

  • 截然不同的大脑网络概况是健康衰老和语义性痴呆症的特征.
  • 多层网络分析揭示了与认知功能相关的结构功能连接变化的特定模式.
  • 这些发现增强了我们对老化和神经退行过程中大脑网络变化的理解.