序列时间预测的特点是神经功率调制和在循环神经网络中
Xiangbin Teng1,2, Ru-Yuan Zhang3
1Department of Psychology, The Chinese University of Hong Kong, Hong Kong SAR, China.
eLife
|October 22, 2025
概括
预测未来的事件涉及大脑动态控制注意力,不依赖外部线索. 这个过程使用alpha-beta脑波功率来抑制无关的噪音,并专注于关键时刻.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 计算机建模 计算建模
背景情况:
- 预测未来的事件对于生存和日常功能至关重要.
- 大脑必须过无关的感官信息 (噪音),以专注于重要的潜在时刻.
- 现有的模型通常依赖于外部时间线索,使内部时间预测机制不清楚.
研究的目的:
- 研究大脑和循环神经网络 (RNN) 如何在没有外部时间线索的情况下预测连续的未来时刻.
- 通过内部神经动态的镜头重新解释时间预测的过程.
- 识别神经签名和计算机制,这些机制是基于记忆引导的时间预测的基础.
主要方法:
- 为人类听众设计了一个使用白噪声和标记时间位置的"记忆"任务.
- 使用功率调制分析来检查在时间预测期间的神经活动.
- 雇佣了针对行为任务优化的RNN,以建模神经动态和功能角色.
- 对RNN进行分析和扰动,以了解神经功率调节的机制.
主要成果:
- 在顺序时间预测期间,在α-β频段中确定了一个独特的神经功率调制模式.
- 观察到神经功率波动准确地预测了在次秒尺度上标记的时间位置.
- 发现RNN隐藏的动态反映了神经调制,表明选择性噪声抑制和对预期时刻的高度敏感性.
- 证明了神经功率调制与音调检测性能之间的相关性.
结论:
- 顺序时间预测是一种动态增益控制过程.
- 预测关键的未来时刻包括积极抑制无关的感官输入 (噪音).
- 在α-β频段中的神经功率调制反映了这种动态增益控制,增强了对预测时间位置的敏感性.
相关概念视频
01:35Long-term Potentiation
58.3K
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.
58.3K
01:25Long-term Potentiation
3.4K
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.
Hebbian LTP
LTP can occur when...
Hebbian LTP
LTP can occur when...
3.4K
01:23Propagation of Action Potentials
8.9K
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...
8.9K
01:19Graded Potential
6.8K
Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or...
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or...
6.8K
01:25Neural Circuits
2.6K
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
2.6K
01:14Action Potential
10.7K
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
10.7K