Figure 4.

Running speed modulation of LFP frequency is independent of spatial environment. A, C, E, Speed modulation of the oscillation frequency of a single hippocampal LFP on a Y-shaped track. B, D, F, LFP recorded at the same tetrode location as the rat ran on a two-dimensional platform immediately after the track session. Similar modulation of frequency by running speed is seen in both environments. A, B, The spatial occupancy maps in each of the two conditions showing the very different shapes of the two environments. C, D, The distribution of speeds measured >200 ms bins in the two environments. E–H, The power shifts in a graded manner to higher frequencies as a function of increasing running speed in both spatial conditions.