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1: Science. 2006 May 5;312(5774):758-62.Click here to read Links
Comment in:
Science. 2006 May 5;312(5774):680-1.

Conjunctive representation of position, direction, and velocity in entorhinal cortex.

Sargolini F, Fyhn M, Hafting T, McNaughton BL, Witter MP, Moser MB, Moser EI.

Centre for the Biology of Memory, Norwegian University of Science and Technology, 7489 Trondheim, Norway.

Grid cells in the medial entorhinal cortex (MEC) are part of an environment-independent spatial coordinate system. To determine how information about location, direction, and distance is integrated in the grid-cell network, we recorded from each principal cell layer of MEC in rats that explored two-dimensional environments. Whereas layer II was predominated by grid cells, grid cells colocalized with head-direction cells and conjunctive grid x head-direction cells in the deeper layers. All cell types were modulated by running speed. The conjunction of positional, directional, and translational information in a single MEC cell type may enable grid coordinates to be updated during self-motion-based navigation.

PMID: 16675704 [PubMed - indexed for MEDLINE]