感官体验引导小鼠视觉皮层中的表征漂移
Joel Bauer1,2,3, Uwe Lewin4,5, Elizabeth Herbert6
1Max Planck Institute for Biological Intelligence, Martinsried, Germany. joel.bauer@ucl.ac.uk.
Nature communications
|October 23, 2024
概括
神经元的表征逐渐发生变化,这种现象被称为表征漂移. 这项研究表明,虽然突触波动驱动漂移,但视觉体验指导其方向,使大脑能够适应其环境.
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:
- 代表性漂移,神经元表示的持续变化,在大脑区域中观察到.
- 代表性漂移的原因,无论是感官体验引起的突触可塑性还是内在突触挥发性,仍然不清楚.
研究的目的:
- 调查主要视觉皮层中代表性漂移背后的机制.
- 确定突触可塑性和内在突触波动性对神经元表示变化的相对贡献.
- 探索感官体验如何影响表达漂移的方向和程度.
主要方法:
- 慢性双光子成像在雌性小鼠的初级视觉皮层.
- 使用圆柱镜头护目镜来限制视觉输入到狭窄的方向范围.
- 使用网络模型来模拟神经元动态和突触可塑性.
主要成果:
- 个体神经元所喜欢的刺激方向在几周内慢慢地漂移.
- 漂移的方向,而不是它的大小,是由视觉输入的统计数据显著偏差的.
- 网络模型表明,突触波动是漂移的主要驱动因素,由经验依赖的Hebbian可塑性调节.
结论:
- 突触波动驱动表示漂移,而经验驱动的Hebbian可塑性稳定神经元表示.
- 在感官剥夺下,赫比安机制促进了适应.
- 赫比亚的突触可塑性积极地引导代表性漂移与环境统计数据保持一致.
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