Fig. 4.

Example place cells. (A) Activity of a place cell from the hippocampus of patient 1. (Left) Depiction of this cell's activity during clockwise movement. (Middle) Depiction of this cell's activity during counterclockwise movement. Color scale indicates each cell's firing rate (in Hz). (Right) Computed place field of this cell (Materials and Methods). Red place field indicates that this cell activated when the place field was traversed while traveling clockwise. (B) Example place cell from the hippocampus of patient 5. (C) Place cell from the hippocampus of patient 13. (D) Place cell from the entorhinal cortex of patient 5. (Right) Blue place field indicates that this cell was activated when this position was traversed while moving counterclockwise.