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Both hypnosis and mindfulness meditation states feature higher levels of activity in areas where theta frequency brain waves are prominent, especially the ACC (235,236) and the hippocampus, source of these theta rhythms.
The Fourier filters with the passbands corresponding to the ranges of alpha, beta, delta, and theta rhythms have been designed [4,11,12].
Hippocampal theta rhythm : The theta rhythm recorded from the hippocampus is the largest signal (1-2 mV) that can be recorded in the normal EEG of mammalian brain (56).
They found a frontal midline theta rhythm which increased with increasing memory load.