Summary
Unit activity recorded from the cingulate cortex during theta rhythm shows periodic trains of spikes which are phase-locked to the local theta field potential waves. These cortical theta units were also shown to be correlated with hippocampal theta units. These findings, along with the fact that theta field potentials show a phase reversal within the cingulate cortex, lead to the conclusion that this cortical area is a source of theta activity.
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Holsheimer, J. Generation of theta activity (RSA) in the cingulate cortex of the rat. Exp Brain Res 47, 309–312 (1982). https://doi.org/10.1007/BF00239391
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DOI: https://doi.org/10.1007/BF00239391