电压关闭的纳米流体突触与阴离子-π 相互作用启用了超长期记忆
Xin Peng1, Guoyuan Zhang1, Hao Tian2
1Department of Mechanics and Aerospace Engineering, and Center for Complex Flows and Soft Matter Research, Southern University of Science and Technology (SUSTech), Shen zhen 518055, China.
Nano letters
|July 22, 2025
概括
我们开发了一个模仿神经功能的石墨烯纳米流体突触. 这个设备展示了用于神经形态计算的超长期记忆,为先进的人工智能铺平了道路.
科学领域:
- 神经科学是一个神经科学.
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 离子通道是神经信息处理的基础.
- 使用离子动态的离子仿真为人工突触提供了一条途径.
- 现有的人工突触模型往往缺乏长期记忆能力.
研究的目的:
- 利用石墨烯通道开发一个电压关闭的纳米流体突触.
- 为了研究该设备的突触可塑性和记忆特征.
- 展示实现逻辑运算和神经形态计算的潜力.
主要方法:
- 使用原子尺度的石墨烯通道制造一个电压接的纳米流体突触.
- 短期和长期突触可塑性的特征.
- 使用能量分散光谱 (EDS) 分析离子保留机制.
- 突触功能的表现,比如配对脉冲促进/抑制和依赖尖峰时间的可塑性.
- 使用多个突触装置实现逻辑操作.
主要成果:
- 石墨烯突触表现出短期的可塑性 (短暂的离子吸附) 和超长期的可塑性 (增强和抑制>5小时).
- 能量分散光谱学证实了通过阴离子-π相互作用在石墨烯通道内持续的离子保留作为非挥发性记忆的基础.
- 该设备成功模仿了包括PPF,PPD和STDP在内的基本突触功能.
- 逻辑操作 (AND/OR 门) 使用一系列这些突触设备来实现.
结论:
- 基于石墨烯的纳米流体突触为离子神经形态计算提供了一个有希望的平台.
- 经过证明的超长期记忆和多功能突触行为是显著的进步.
- 这项技术可能会导致更高效和类似大脑的人工智能系统.
相关概念视频
01:35Long-term Potentiation
55.8K
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.
55.8K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.6K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.6K
01:26Chemical Synapses
9.2K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
9.2K
01:05Long-term Depression
31.5K
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.
31.5K
01:28Integration of Synaptic Events
2.2K
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
2.2K
01:19The Role of Ion Channels in Neuronal Computation
3.3K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
3.3K