多次时间尺度的节律动力学在罗斯特拉风中中枢髓神经元中.
Carl Ashworth1, Melissa Martenson2, Zhigang Shi2
1Computational and Biological Learning Lab, Department of Engineering, University of Cambridge, Cambridge, United Kingdom.
bioRxiv : the preprint server for biology
|December 25, 2025
概括
控制疼痛的脑干神经元将快速反射与缓慢的状态变化相结合. 这项研究揭示了疼痛控制电路的双重时间动态,影响感官调节和内部状态.
科学领域:
- 神经科学是一个神经科学.
- 疼痛研究 疼痛研究
- 系统神经科学 系统神经科学
背景情况:
- 神经回路必须平衡快速的感官反射与较慢的,依赖状态的调制.
- 疼痛控制包括将快速戒断反应与感觉敏感度的动态变化相结合.
- 面腹中枢髓 (RVM) 是一个关键的大脑干中心,用于下降疼痛调节.
研究的目的:
- 为了研究参与疼痛控制的RVM神经元的时间动态.
- 为了确定RVM神经元是否在多个时间尺度上运行,整合快速和缓慢的过程.
- 探索RVM神经活动,感官调制和内部状态之间的关系.
主要方法:
- 在RVM中发现的单个单元记录在体内启动,关闭和中立细胞.
- 概率模型,包括高斯过程模型,以分析神经元活动.
- 对刺激引起的反应和自发的节律振荡的分析.
主要成果:
- RVM 的 ON 和 OFF 细胞显示出具有快速激活和缓慢恢复 (几十秒) 的多相群体反应.
- 这些神经元在没有刺激的情况下表现出缓慢的,准周期性振荡 (分钟).
- 节奏动态是特定于启动和关闭单元的,并且与自主参数保持一致.
结论:
- RVM神经元在多个时间尺度上运作,结合快速的刺激唤起和缓慢的内在动态.
- 一个多时间尺度的组织原理控制着脑干下降的疼痛控制电路.
- 这些动态共同调节感官调节和内部状态控制,潜在地将感知和稳态联系起来.
相关概念视频
01:35Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
01:09Torsional Pendulum
A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
01:06Forced Oscillations
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
01:20Motor Unit Stimulation
When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
01:22Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
01:23Propagation of Action Potentials
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...