高原潜力是新皮质中行为时间尺度突触可塑性的教导性信号
Courtney E Yaeger1, Raúl Mojica Soto-Albors1,2, Weizhuo Liu1
1McGovern Institute for Brain Research, MIT, Cambridge, MA, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
视觉皮层神经元中的高原潜力通过调整突触权重来实现快速,单试学习. 这种行为时间尺度突触可塑性 (BTSP) 机制解释了大脑如何快速修改感官表示.
科学领域:
- 神经科学是一个神经科学.
- 突触性可塑性 突触性可塑性
- 学习机制的学习机制
背景情况:
- 突触可塑性是通过在各种时间尺度上修改突触权重来学习的基础.
- 新皮质中的尖端定时依赖可塑性 (STDP) 需要许多精确的活动配对,这对解释快速,一次性学习提出了挑战.
- 行为时间尺度突触可塑性 (BTSP),由海马中的平原潜力驱动,促进单次试验突触重量修改.
研究的目的:
- 研究小鼠初级视觉皮层 (V1) 的第5层金字塔神经元 (L5 PNs) 中高原潜力的存在和功能.
- 通过BTSP.确定平原潜力是否可以通过BTSP.诱导感官表现的单一变化.
- 阐明平原潜能在快速学习和新皮质中突触重量调整中的作用.
主要方法:
- 鼠标V1.1急性切片中的电生理学记录.
- 在L5 PNs中诱导和观察自发和实验诱导的平原潜力.
- 评估突触可塑性和神经元对视觉刺激反应的变化,以达到平原潜力.
主要成果:
- 鼠标V1中的第5层PN显示出普遍的平原潜力.
- 无论是自发的还是诱导的平原潜力,都迅速而持久地改变了L5 PN对视觉刺激的反应.
- 平原潜能诱导了突触特异性可塑性,在长达数秒的间隔内进行最小的重复,与BTSP一致.
结论:
- 高原潜力是新皮质中普遍存在的机制,能够推动神经元表征的快速,一次性变化.
- 由平原潜力介导的BTSP提供了一个动态调整新皮质突触权重的机制,支持快速学习.
- 这一发现挑战了仅STDP模型,并为大脑中的学习机制提供了新的视角.
相关概念视频
Long-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
Long-term Potentiation
58.2K
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.
58.2K
Long-term Depression
3.0K
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.
Calcium Ion Concentration Mechanism
If over...
Calcium Ion Concentration Mechanism
If over...
3.0K
Long-term Depression
33.0K
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.
33.0K
Postsynaptic Potential (PSP)
4.8K
Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
4.8K
Action Potential
10.6K
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...
10.6K


