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A, Autocorrelations for three theta-modulated interneurons. An approximate value for the 8 Hz frequency of local theta is visible from the four clear peaks for the 500 ms interval on each side of t = 0. B, Autocorrelations for three theta-independent interneurons. Although the precise form of the autocorrelation function varies from cell to cell, there is no indication of theta-frequency modulation.
