Skip to main content
. Author manuscript; available in PMC: 2013 May 29.
Published in final edited form as: Nature. 2012 Oct 28;491(7426):761–764. doi: 10.1038/nature11587

Figure 3. Theta bouts and theta modulation of grid cells.

Figure 3

a. Top: 5 second raw LFP trace with theta (3–12 Hz) bouts indicated in gray. Bottom: spectrogram showing the power (dB) of the top LFP trace. b. Grid cells were phase-locked to LFP theta (60-degree bins, red curve: mean ± s.e.m., dashed curve: prototype theta oscillation, two cycles are shown). c. Autocorrelation showing theta modulation of the spike train of a grid cell (theta index = 11.2 at 4.2 Hz). d. Histogram of the saccade rate during image viewings in 19 sessions (4.16 ± 1.49 Hz, mean ± s. d.., dashed gray line = median, 3.92). e. Saccade times (n = 17) resulted in lower theta indices than the grid cell spike trains (n = 20) (P < 0.01, n = 15, Wilcoxon rank-sum test).