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Theta rhythmicity of anteroventral spike clusters. A, Distribution of spike train intervals (mean ± SEM) for HD-by-theta units. The dashed vertical line denotes interval of 125 ms (8 Hz). The values of HD cells are indicated with gray. B, Mean values of the spike train frequency (in hertz) for all HD-by-theta cells. The inset on the right represents the averaged frequency for all HD-by-theta cells (along with their SD).
