在皮层神经元中,时间输入序列的树突歧视
Tiago Branco1, Beverley A Clark, Michael Häusser
1Wolfson Institute for Biomedical Research and Department of Neuroscience, Physiology, and Pharmacology, University College London, Gower Street, London WC1E 6BT, UK.
Science (New York, N.Y.)
|August 14, 2010
概括
金字塔神经元树突可以检测突触输入的顺序. 这种对大脑功能至关重要的序列检测依赖于局部信号和非线性受体激活.
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.
- 细胞神经科学 细胞神经科学
背景情况:
- 时间序列检测对于大脑功能,如感知和运动控制至关重要.
- 了解个体神经元如何处理序列信息是破译神经计算的关键.
研究的目的:
- 研究皮质金字塔神经元中单个树突的检测和区分突触激活的时间序列的能力.
- 阐明负责树突中的序列灵敏性的潜在生物物理机制.
主要方法:
- 利用有图案的两光子谷氨酸脱来精确控制树突上的突触激活.
- 记录了局部树突性信号和体性去极化,以应对有模式的刺激.
- 分析了序列选择性神经元输出 (尖峰发射).
主要成果:
- 皮质金字塔神经元的单个树突显示出对突触激活顺序的敏感性.
- 这种序列灵敏度是由局部树突动力学和体性去极化编码的.
- 该机制涉及树突阻抗梯度和N-甲基-D-酸盐 (NMDA) 受体的非线性激活.
- 对于传递给单个树突的模式和分布在树突树上的模式,观察到序列歧视.
结论:
- 金字塔细胞树突的功能是独立的计算单元,能够处理突触序列.
- 树突在实施与时间信息处理相关的基本皮质计算方面发挥着关键作用.
- 这种树突计算使神经元能够区分复杂的时间模式,有助于感知,认知和运动控制.
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