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. 2012 May 9;32(19):6501–6510. doi: 10.1523/JNEUROSCI.5871-11.2012

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Copyright © 2012 the authors 0270-6474/12/326501-10$15.00/0

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Figure 6. — Rebound excitation in theta phase-modulated interneurons is not caused by the synchronization between the neuronal firing rate and the theta rhythm. A, Probability distribution of the interspike intervals of a typical theta phase-modulated interneuron during theta state. Note the peaks at the harmonic of theta frequency, which suggest possible intervals of synchronization between the neuronal firing rate and the theta frequency. B, CCGs obtained using spikes with ISI >100 ms from the spike trains of a pair of PIR displaying theta phase-modulated interneurons—very low number of counts in the CCG show that the correlated firing between isolated spikes of two cells was negligible. C, CCGs obtained using spikes with ISI <100 ms from the spike trains of the same pair of interneurons.