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Article Dans Une Revue Brain Structure and Function Année : 2017

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

Résumé

Path integration is a navigation strategy that requires animals to integrate self-movements during exploration to find 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 impair 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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Dates et versions

hal-01664365 , version 1 (14-12-2017)

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Pierre-Yves Jacob, Marta Gordillo-Salas, Justine Facchini, Bruno Poucet, Etienne Save, et al.. Medial entorhinal cortex and medial septum contribute to self-motion-based linear distance estimation. Brain Structure and Function, 2017, 222 (6), pp.2727 - 2742. ⟨10.1007/s00429-017-1368-4⟩. ⟨hal-01664365⟩
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