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Long-term Depression01:03

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...
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Combining Transcranial Magnetic Stimulation and fMRI to Examine the Default Mode Network
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默认模式网络功能和功能障碍的生物物理机制.

Trang-Anh E Nghiem, Vinod Menon

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    此摘要是机器生成的。

    大脑模拟揭示了胰岛是如何抑制默认模式网络 (DMN) 的,以及刺激-抑制平衡的破坏是如何导致大脑疾病中的DMN功能障碍的. 这项工作将细胞机制与大规模网络动态联系起来.

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    科学领域:

    • 神经科学是一个神经科学.
    • 计算神经科学是一种神经科学.
    • 系统神经科学 系统神经科学

    背景情况:

    • 默认模式网络 (DMN) 对于内部认知至关重要,但在细胞层面上对其被外部刺激抑制的理解很差.
    • 干扰DMN与各种大脑疾病有关,通常与神经元激发和抑制的失衡有关.

    研究的目的:

    • 阐明通过突出刺激抑制DMN的细胞机制.
    • 研究神经元激发抑制平衡的破坏如何影响DMN功能和稳健性.
    • 模拟细胞水平变化与大脑中大规模网络动态之间的联系.

    主要方法:

    • 整脑计算建模,结合神经元生物物理学.
    • 整合逆行追踪器衍生的定向小鼠大脑连接学.
    • 系统的大脑分析和参数空间探索网络动态.

    主要成果:

    • 胰岛刺激有效抑制DMN活动,而带带皮层刺激显示出对抗作用.
    • 在广泛的刺激-抑制平衡和胆固醇调节中,DMN的完整性是强大的.
    • 确定了DMN功能的明显故障模式,包括响应能力丧失和网络碎片化,特定的大脑枢纽显示了差异性的脆弱性.

    结论:

    • 这项研究提供了一个机制框架,将细胞激发-抑制平衡与DMN强度和脆弱性联系起来.
    • 这些发现突出了岛屿在DMN抑制中的关键作用,并将特定的调节枢纽 (如后皮质) 确定为脆弱点.
    • 该模型提供了对大脑疾病中观察到的DMN功能障碍异质模式的见解,并提出了潜在的治疗点.