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. 2015 Mar 24;9:38. doi: 10.3389/fncom.2015.00038

Figure 4.

Figure 4

Periodogram of epileptic (in red) and non-epileptic (unhealthy in blue and healthy tissue in green) segments of EEG signals where a shift in the EEG signal power from lower to higher frequencies in the presence of epileptiform activity is evident.