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. 2011 Jun 29;31(26):9489–9502. doi: 10.1523/JNEUROSCI.0353-11.2011

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Copyright © 2011 the authors 0270-6474/11/319489-14$15.00/0

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Figure 9. — Directional modulation of anteroventral theta cells corresponds to HD activity. A, Firing rate versus head direction tuning plot for a directional theta (red) and a HD cell (purple) recorded from the same tetrode channel. The inset on the left represents the spike waveform (above) and −10/10 ms autocorrelogram (below) for the theta-bursting unit, while the inset on the right represents the same parameters for the HD unit. B, Two examples of cross-correlograms between proximally located directional theta and HD cells. Time 0 is denoted by dashed white line. C, Sample recordings, representing the parallel activity of directional theta (red) and HD (purple) units and recorded during the preferred direction for the HD unit. Simultaneously recorded LFP (green trace) and the concurrent heading direction, measured in degrees (black trace), are plotted below. D, Sample recordings of the same pair during nonpreferred for the HD unit direction. Simultaneously recorded LFP (green trace) and the concurrent heading direction, measured in degrees (black trace), are plotted below. Note the decreased number of directional theta spikes compared with C.