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相关概念视频

The Synapse02:47

The Synapse

99.9K
Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
99.9K
Electrical Synapses01:28

Electrical Synapses

10.1K
Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
10.1K
Overview of Synapses01:25

Overview of Synapses

10.9K
A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
10.9K
Chemical Synapses01:26

Chemical Synapses

10.9K
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...
10.9K
Neurons as Communicators of the Brain01:22

Neurons as Communicators of the Brain

5.2K
Neurons, the fundamental units of the brain and nervous system, function as the primary transmitters of information throughout the body. Their ability to communicate through electrical and chemical signals is vital for every bodily function, from regulating the heartbeat to processing complex thoughts. Each neuron has three main components: the cell body (soma), dendrites, and an axon, each specialized to facilitate swift and efficient neural communication.
Cell Body
The cell body, also known...
5.2K
Neuronal Communication01:28

Neuronal Communication

5.5K
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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相关实验视频

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An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
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An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

Published on: March 10, 2011

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一个高效的大脑开关,用于异步的大脑与计算机接口.

Daniel Valencia, Patrick P Mercier, Amir Alimohammad

    IEEE transactions on biomedical circuits and systems
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    概括
    此摘要是机器生成的。

    本研究介绍了第一个基于局部场势 (LFP) 的脑开关,用于异步的皮质内脑-计算机接口 (iBCI). 这种新的设计显著降低了体内信号处理的功耗,增强了实际的BCI应用.

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    相关实验视频

    Last Updated: Apr 30, 2026

    An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces
    10:51

    An Experimental Platform to Study the Closed-loop Performance of Brain-machine Interfaces

    Published on: March 10, 2011

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    Assessment and Communication for People with Disorders of Consciousness
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    科学领域:

    • 神经科学是一个神经科学.
    • 生物医学工程 生物医学工程
    • 计算机工程 计算机工程

    背景情况:

    • 皮层内脑计算机接口 (iBCI) 传统上使用动作潜能 (spikes) 来通过特定应用的集成电路 (ASIC) 来处理信号.
    • 异步iBCI依赖于"大脑开关"来检测基于尖端活动的用户参与,这是计算密集的.
    • 局部场势 (LFP) 为ASIC中的体内信号处理提供了低功率的替代品.

    研究的目的:

    • 为非同步iBCI展示基于LFP的脑开关的首次设计和实现.
    • 开发一种更实用,更节能的解决方案,用于iBCI中的体内信号处理.
    • 为了证明使用封闭的循环神经网络 (RNN) 用于基于LFP的大脑开关功能的可行性.

    主要方法:

    • 基于LFP的脑开关的设计和实施,使用封闭的循环神经网络 (RNN).
    • 在体内基于LFP的特征提取单元的开发,在180nmCMOS过程中合成.
    • 对合成ASIC的功耗和面积的评估.

    主要成果:

    • 基于LFP的脑开关不需要详尽的学习阶段来选择频道或频段,从而提高了实际应用性.
    • 合成的ASIC占据了一个小的面积 (0.09毫米2),在2kHz时消耗最小的功率 (91.87nW).
    • 拟议的设计实现了与传统的基于尖峰的脑开关可比的状态估计性能,同时消耗的电量显著减少.

    结论:

    • 以LFP为基础的脑开关为异步iBCI提供了高功率的高效替代品.
    • 开发的基于RNN的设计通过消除复杂的学习阶段来简化实际实施.
    • 这一进步为更容易获得和可持续的体内BCI技术铺平了道路.