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. 2015 Nov 18;9:438. doi: 10.3389/fnins.2015.00438

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Copyright © 2015 Mikkelsen, Kappel, Mandic and Kidmose.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The α-band power during the α-attenuation paradigm for the ELE channel. Top panel: the spectrogram for a specific subject, where each column shows the power spectrum for a 4-s data segment. Neighboring columns have time offset by 1 s (meaning 3 s overlap). Bottom panel: Averaged power in the 8–12 Hz band, averaged over all subjects. The wide band demarcates the area between 15 and 85% percentiles, and has been smoothed with a moving average filter of 5 s width. The line within the band shows the grand average, not smoothed. In both panels, the dB scale is relative to 1 (µV)²/Hz.