在皮层中对新奇性的临界缩放
Tiago L Ribeiro1, Ali Vakili1, Bridgette Gifford1
1Section on Critical Brain Dynamics, National Institute of Mental Health, Bethesda, MD, USA.
Nature communications
|January 10, 2026
概括
大脑通过调动大型神经网络,迅速检测出新奇的事件. 这项研究表明,关键的大脑动态增强视觉皮层.
科学领域:
- 神经科学是一个神经科学.
- 计算神经科学是一种神经科学.
- 系统神经科学 系统神经科学
背景情况:
- 新皮质处理复杂的信息,用于决策和行为.
- 检测新的或意想不到的事件对于在不确定的环境中生存至关重要.
- 新皮质检测新兴刺激的机制尚不清楚.
研究的目的:
- 为了研究稀疏,意想不到的神经活动如何影响当地的皮质电路.
- 为了确定单个神经元是否可以调动大型神经网络以应对新奇的刺激.
- 探索关键大脑动态在检测意外事件中的作用.
主要方法:
- 有针对性的全息刺激,在单个金字塔神经元中引起稀疏的"惊喜"峰值.
- 两光子成像监测这些尖峰对邻近神经元的影响.
- 机器学习分类器用于分析与刺激来源相关的信息分布.
- 皮层网络模拟以验证实验发现.
主要成果:
- 单个"惊喜"尖峰触发了周围神经元的强烈,短暂的招募,遵循权力法分配.
- 持续的皮质活动表现出神经元雪崩,这是接近临界系统的特征.
- 关于刺激来源的信息可靠地识别,并分布在整个网络中.
- 模拟证实,观察到的缩放和信息分布与关键系统的预测一致.
结论:
- 视觉皮层表现出对小扰动的放大反应,这是关键性的标志.
- 大脑皮层中的关键动态增强了它检测新事件的能力.
- 稀少的神经活动可以有效地调动大规模的皮质网络.
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