在视觉皮层模型中的响应保留和明显运动效应
Vasilii S Tiselko1,2, Maxim Volgushev3, Dirk Jancke4
1Laboratory of Complex Networks, Center for Neurophysics and Neuromorphic Technologies, Moscow, Russia.
PloS one
|November 2, 2023
概括
神经网络通过强烈的反复连接保留对刺激的反应,使大脑能够感知明显的运动. 这种响应保留对于生成模仿真实运动的平滑活动模式至关重要.
科学领域:
- 计算神经科学是一种神经科学.
- 视觉感知 视觉感知 视觉感知
- 神经动力学 神经动力学
背景情况:
- 表面运动,一种视觉幻觉,是当静止的刺激连续闪时感知到的,从而产生运动的印象.
- 主要视觉皮层表现出平滑的时空活动模式,以响应明显的运动,类似于实际运动.
- 产生这些模式的一个关键因素是大脑延长对短暂刺激的反应的能力,称为响应保留.
研究的目的:
- 研究神经网络中反应保留背后的机制.
- 为了确定在明显的运动感知过程中观察到的光滑的时空活动概况的起源.
- 分析反复连接和其他因素在实现响应保留中的作用.
主要方法:
- 利用基于发射率的模型与环状结构来模拟神经网络.
- 采用了基于导电性的生物详细耐火密度 (CBRD) 模型,并采用了视网膜拓空间表示.
- 在不同的连接强度和模型参数下分析了响应保留和活动模式.
主要成果:
- 经常性连接的强度被确定为神经网络中响应保留的主要决定因素.
- 响应保留与环模型中"碰撞吸引力"状态的出现有关.
- 虽然突触抑郁和其他因素影响了记忆,但它们无法在连接性较弱的模型中取代强烈的反复连接.
结论:
- 强大的反复连接对于神经网络来说至关重要,以表现出响应保留,这是明显运动感知的先决条件.
- 层级网络架构可以弥补较弱的横向连接,通过前传播促进活动保留.
- 网络保留响应的能力与其产生与明显运动相一致的光滑时空活动模式的能力之间存在直接相关性.
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