白物質の過剰濃度による認知低下を妨げる
Arthur P Hamilton1, Kaiah N Sotebeer2, John G Grundy2
1Carleton University, Department of Cognitive Science.
medRxiv : the preprint server for health sciences
|September 2, 2025
まとめ
ホワイトマターの過剰濃度 (WMHs) は脳の接続性を破壊し,高齢者の認知能力に影響します. コグニティブ・リザーブは,WMHが引き起こしたネットワークの障害にもかかわらず,認知を保ち,これらの負の影響を相殺する可能性があります.
科学分野:
- 神経科学
- ゲロントロジー
- 医療用イメージング
背景:
- 前回の白質高強度 (WMHs) と認知機能低下に関する研究は,主に全体的な病変負荷を評価した.
- WMHによって引き起こされる局所的な接続障害の測定を可能にする新しいLesion Quantification Toolkit (LQT) が開発されました.
研究 の 目的:
- 健康な老化における認知機能に対するWMH誘発の局所的接続障害の影響を評価するためにLQTを適用する.
- WMHに関連したネットワーク障害,認知障害,認知予備の関係を調査する.
主な方法:
- 高齢者の3つの既存のMRIデータセット (N=259) を利用した.
- Lesion Quantification Toolkit (LQT) を使用して,WMHによる脳接続の局所的な障害を定量化しました.
- 接続障害,認知能力,年齢,認知予備の関係を分析する 最小二乗経路モデリングを適用した.
主要な成果:
- 接続障害と認知機能の低下との関連が確認されました
- 詳細な認知リザーブを測定したデータセットでは,より高い認知リザーブがよりよい認知パフォーマンスと関連していました.
- WMHの有害な認知効果を和らげることが示唆されています.
結論:
- WMHによる局所的な接続障害は,高齢者の認知機能低下の重要な要因です.
- コグニティブ・リザーブは,WMHに関連する脳の変化の影響をバッファリングすることによって,認知機能を維持する上で重要な役割を果たします.
- LQTは認知老化の神経生物学的な基礎を理解するための より洗練されたアプローチを提供します.
さらに関連する動画
06:58Highlighting and Reducing the Impact of Negative Aging Stereotypes During Older Adults' Cognitive Testing
Published on: January 24, 2020
7.4K
12:50Lesion Explorer: A Video-guided, Standardized Protocol for Accurate and Reliable MRI-derived Volumetrics in Alzheimer's Disease and Normal Elderly
Published on: April 14, 2014
40.3K
関連する概念動画
01:30Cognitive Development During Adulthood
255
Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
255
01:27Language and Cognition
438
Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
438
01:30Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists
206
Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function.
206
01:23Role of Neurotransmitters in Memory
964
Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
964
01:14Role of Cerebellum and Prefrontal Cortex in Memory
570
The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
570
01:24Working Memory
444
Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
444