The firing of most hippocampal neurons is modulated by the theta rhythm, but it's not clear how and where the rhythm is generated. A study now shows that the required machinery for theta generation lies in local circuits of the hippocampus.
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Colgin, L., Moser, E. Hippocampal theta rhythms follow the beat of their own drum. Nat Neurosci 12, 1483–1484 (2009). https://doi.org/10.1038/nn1209-1483
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DOI: https://doi.org/10.1038/nn1209-1483
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