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EEG and MR spectra obtained from two cultures (a and b) plus the control (c). To compare between the MR and EEG spectra, only the 0–5 Hz frequency range is shown for the EEG. (a and b) Signal power is reduced after TTX administration (green vs. black lines). Residual peaks in the TTX phase spectra, also present in the PRE state, are possibly due to systematic noise. (c) For the control experiment, there was no significant change in signal power after TTX administration.
