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. 2018 Aug 2;8:11588. doi: 10.1038/s41598-018-29331-8

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© The Author(s) 2018

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High θ/δ ratio differentiates REM epochs exhibiting θ-HFO coupling. Median (n = 6) comodulograms for the REM epochs for which the CA1 LFP has a high θ/δ ratio (left), and for the REM epochs exhibiting a low θ/δ ratio (right).