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Jason R. Climer, Ehren L. Newman and Michael E. Hasselmo Phase coding by grid cells in unconstrained environments: two-dimensional phase precession European Journal of Neuroscience 38

Article first published online: 29 MAY 2013 | DOI: 10.1111/ejn.12256

Thumbnail image of graphical abstract

Experimental Examples of Precession using the Omnidirectional Pass Index. (A) Example histology showing tetrode tracks targeted at medial entorhinal cortex. (B) Local field potential data recorded in our lab is shown in black. Top is the unfiltered trace, bottom is filtered (6–10 Hz). Red tick marks indicate the firing of a single grid cell as the animal moves in and out of grid fields. (C-F) Example plots from a precessing grid cell from our experimental data: (C) Rate map, (D) Trajectory with spikes colored by the pass index at each spike, (E) Scatter plot of the LFP theta phase vs. the pass index. Correlation coefficients (rho), significance (p), and slopes (s, in degrees/pass) indicated. (F) Occupancy-normalized rate maps of the scatter plot in E.

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