超稳定的振荡模式来自于大脑时空连接器的同步
Joana Cabral1,2,3,4, Francesca Castaldo5, Jakub Vohryzek2,6
1Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal.
Communications physics
|January 30, 2024
概括
短暂的大脑节奏是由于网络延迟导致的转移稳定同步而产生的. 这项研究模拟了合的大脑振荡如何创造集体节奏,解释了在MEG扫描中观察到的人类大脑活动模式.
科学领域:
- 神经科学是一个神经科学.
- 计算物理 计算物理
- 网络科学 网络科学
背景情况:
- 人类大脑活动表现出通过电磁脑电图 (EEG/MEG) 检测到的各种振荡信号.
- 连贯大脑振荡的基本机制及其与神经活动的关系尚未完全理解.
- 现有的假设表明,短暂的大脑节奏可能来自转移稳定的同步.
研究的目的:
- 调查假设暂时的脑节奏是转移稳定的同步的签名.
- 探索大脑区域之间的延迟如何影响集体振荡频率.
- 用物理原理模拟大脑节律的出现.
主要方法:
- 模拟了一种缓冲振荡器系统,结合背景噪声来模仿玛频振荡.
- 振荡器是基于代表大脑连接的扩散加权通道图数据来合的.
- 全球合强度和导电速度被系统地变化,以观察新出现的现象.
主要成果:
- 确定了一个关键的状态,在这个状态下,在子马频率上出现了转移稳定的振荡模式 (MOM).
- 这些模拟的MOM非常接近89名健康个体的静止状态磁脑电图 (MEG) 功率光谱.
- 包括频率,持续时间,规模和功能连接在内的MOM的关键特征可以通过全局参数进行控制,而不会改变连接组结构.
结论:
- 这项研究表明,连接体的时空结构中的相互作用可以产生集体大脑节奏.
- 由网络延迟影响的元稳定同步,为观察到的大脑振荡提供了机械解释.
- 这种基于物理的建模方法为我们提供了关于大脑活动在空间和时间中的组织的见解.
相关概念视频
01:04Oscillations about an Equilibrium Position
5.4K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
5.4K
01:07Damped Oscillations
5.7K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
5.7K
01:23Propagation of Action Potentials
5.7K
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
5.7K