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© Shalin E. Abraham, Michael Häusser, Christoph Schmidt-Hieber, University College London
The dentate gyrus is one of the few mammalian brain regions where new neurons are generated throughout life. The image was taken with a confocal microscope from a parasagittal slice of the mouse hippocampus. Cells were labelled with fluorescent markers: Newly generated neurons are red (doublecortin), mature neurons are green (NeuN), and nuclei are blue (DAPI)
Publication : Nature Neuroscience

Active dendritic integration as a mechanism for robust and precise grid cell firing

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature Neuroscience - 19 Jun 2017

Schmidt-Hieber C, Toleikyte G, Aitchison L, Roth A, Clark BA, Branco T, Häusser M

Link to Pubmed [PMID] – 28628104

Nat Neurosci. 2017 Aug;20(8):1114-1121

Understanding how active dendrites are exploited for behaviorally relevant computations is a fundamental challenge in neuroscience. Grid cells in medial entorhinal cortex are 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 contribute to the generation of 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 dendritic 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.