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Medial entorhinal cortex and medial septum contribute to self-motion-based linear distance estimation

Brain Structure and Function volume 222, pages 2727–2742 (2017)Cite this article

Abstract

Path integration is a navigation strategy that requires animals to integrate self-movements during exploration to determine their position in space. The medial entorhinal cortex (MEC) has been suggested to play a pivotal role in this process. Grid cells, head-direction cells, border cells as well as speed cells within the MEC collectively provide a dynamic representation of the animal position in space based on the integration of self-movements. All these cells are strongly modulated by theta oscillations, thus suggesting that theta rhythmicity in the MEC may be essential for integrating and coordinating self-movement information during navigation. In this study, we first show that excitotoxic MEC lesions, but not dorsal hippocampal lesions, impair the ability of rats to estimate linear distances based on self-movement information. Next, we report similar deficits following medial septum inactivation, which strongly impairs theta oscillations in the entorhinal–hippocampal circuits. Taken together, these findings demonstrate a major role of the MEC and MS in estimating distances to be traveled, and point to theta oscillations within the MEC as a neural mechanism responsible for the integration of information generated by linear self-displacements.

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Acknowledgements

We thank Boris Burle for help with data analysis, and the Spatial Cognition group for discussion. Financial support was provided by the Institut Universitaire de France to FS. P.Y.J. salary was financed by the Fondation pour la Recherche Médicale (Paris).

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    Authors and Affiliations

    1. Aix Marseille Univ, CNRS, LNC UMR 7291, 13331, Marseille, France

      Pierre-Yves Jacob, Marta Gordillo-Salas, Justine Facchini, Bruno Poucet, Etienne Save & Francesca Sargolini

    2. Aix Marseille Université, CNRS, FR 3512, 13331, Marseille, France

      Pierre-Yves Jacob, Marta Gordillo-Salas, Justine Facchini, Bruno Poucet, Etienne Save & Francesca Sargolini

    3. Institut Universitaire de France, Paris, France

      Francesca Sargolini

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    1. Pierre-Yves Jacob
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    Correspondence to Francesca Sargolini.

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    E. Save and F. Sargolini contributed equally to the study.

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    Jacob, PY., Gordillo-Salas, M., Facchini, J. et al. Medial entorhinal cortex and medial septum contribute to self-motion-based linear distance estimation. Brain Struct Funct 222, 2727–2742 (2017). https://doi.org/10.1007/s00429-017-1368-4

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    • DOI: https://doi.org/10.1007/s00429-017-1368-4

    Keywords

    • Entorhinal cortex
    • Medial septum
    • Distance coding
    • Theta oscillations
    • Path integration
    • Grid cells