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Histograms of individual alpha frequency (IAF), as obtained in (a) the power spectrum of the eyes‐closed condition, (b) the power spectrum of the eyes‐open condition, and (c) the difference in power between the eyes‐closed and eyes‐open conditions. (d). A histogram of the difference between IAFs obtained in eyes‐closed and eyes‐open conditions (IAF‐ec minus IAF‐eo). F = Frequency; dF = difference in frequency.
