在未成熟的皮层网络中,模块化活动的自我组织
Haleigh N Mulholland1, Matthias Kaschube2,3, Gordon B Smith4,5
1Department of Neuroscience, University of Minnesota, Minneapolis, MN, 55455, USA.
Nature communications
|May 21, 2024
概括
发展的大脑网络动态地将神经活动组织成模块化模式. 这项研究证实,局部激发与侧面抑制 (LE/LI) 机制塑造了这些模式,指导了感觉图的形成.
科学领域:
- 神经科学是一个神经科学.
- 发育神经科学的发展神经科学.
- 计算神经科学是一种神经科学.
背景情况:
- 在发育过程中,皮质活动组织成模块化模式,先于成熟的柱状结构.
- 具有局部激发和横向抑制 (LE/LI) 的循环神经网络在理论上被认为可以产生结构化的神经活动.
- 了解早期皮层网络组织的机制对于解释感官地图形成至关重要.
研究的目的:
- 实验验证LE/LI机制在组织皮质活动中的预测.
- 研究皮质网络如何对模式刺激和内在网络倾向做出反应.
- 探索早期皮层发育中的自发活动和唤起的活动之间的关系.
主要方法:
- 在眼睛打开之前,在幼皮质中同时进行广场成像和光遗传学.
- 采用带有不同空间波长的统一和有模式的光遗传刺激.
- 分析皮质活动模式的空间特征和动态演变.
主要成果:
- 皮层网络将均刺激转化为具有特征空间波长的模块化模式.
- 在特征波长的光遗传刺激有选择性地偏向唤起的活动.
- 不同波长的刺激将活动推向网络的内在特征波长,表明了动态妥协.
- 早期的自发皮质活动结构反映了统一的光学唤起活动,这表明了共享的潜在机制.
结论:
- LE/LI连接模型为结构化皮质活动的动态出现提供了一个可行的机制.
- 皮层网络表现出一种内在的倾向,即在特定的空间尺度上组织活动,从而影响感官地图的发展.
- 这些发现支持自发和唤起活动的共同发育机制,为有序的感官表现奠定了基础.
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