In addition to the measures of oscillations in traditional frequency bands, one twin study addressed slower EEG dynamics using a measure of amplitude modulation, i.e. the temporal structure of the waxing and waning of the amplitudes of spontaneous alpha and beta EEG oscillations on time scale of 1 to 20 seconds using detrended fluctuation analysis (Linkenkaer-Hansen et al., 2007). There is evidence that correlations in brain oscillations on a large time scale (up to tens of seconds) may be important for performance of tasks that require coordination of neuronal activity on multiple time scales (Linkenkaer-Hansen et al., 2005). This study showed high (around 60%) heritability of “long-range temporal correlation measures” across the entire scalp; importantly, these measures were independent from the overall frequency-band power.
