Active dendritic integration as a mechanism for robust and precise grid cell firing.
Active dendritic integration as a mechanism for robust and precise grid cell firing.
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DOI:
10.1038/nn.4582
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发表时间:
2017-08
影响因子:
25
通讯作者:
Häusser M
中科院分区:
文献类型:
--
作者:
Schmidt-Hieber C;Toleikyte G;Aitchison L;Roth A;Clark BA;Branco T;Häusser M
Understanding how active dendrites are exploited for behaviorally relevant computations is a fundamental challenge in neuroscience. Grid cells in medial entorhinal cortex represent an attractive model system for addressing this question, as the computation they perform is clear: they convert synaptic inputs into spatially modulated, periodic firing. Whether active dendrites transform synaptic input into the dual temporal and rate codes characteristic of grid cell output is unknown. We show that dendrites of medial entorhinal cortex neurons are highly excitable and exhibit a supralinear input–output function in vitro, while in vivo recordings reveal membrane potential signatures consistent with recruitment of active conductances. By incorporating these nonlinear dynamics into grid cell models, we show that they can sharpen the precision of the temporal code and enhance the robustness of the rate code, thereby supporting a stable, accurate representation of space under varying environmental conditions. Our results suggest that active dendrites may therefore constitute a key cellular mechanism for ensuring reliable spatial navigation.
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影响因子:
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作者:
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影响因子:
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作者:
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DOI:
10.1073/pnas.1209918109
发表时间:
2012-10-23
影响因子:
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通讯作者:
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