File information

filename	C:\Users\CGX\Desktop\Q20v2 Single Condition 5 min Eyes Open Eyes Closed.edf
file size in Mb	7.89
file modification time	Oct 10, 2025, 12:35:08
num channels	26
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num timepoints	153000
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filename	C:\Users\CGX\Desktop\Q20v2 Single Condition 5 min Eyes Open Eyes Closed.edf
file size in Mb	7.89
file modification time	Oct 10, 2025, 12:35:08
num channels	26
channel labels	F7, Fp1, Fp2, F8, F3, Fz, F4, C3, Cz, T6, T5, Pz, P4, T3, P3, O1, O2, C4, T4, A2, ExG1, ExG2, ACCX, ACCY, ACCZ, TRIGGER
num timepoints	153000
file length in seconds	306.0
sampling rate	500.0
metadata	(none found)
trim range start	163.0
trim range end	296.0

Power Spectral Density (PSD)

This section shows how the brain's electrical activity is distributed across frequencies for each EEG channel. Power spectral density (PSD) was calculated using 2-second segments with the Multitaper method, which improves stability by reducing noise and variance in the signal.

To highlight meaningful features, the data were corrected for the 1/f effect—a natural pattern in EEG where lower frequencies have higher power, making it harder to see peaks at higher frequencies. This correction flattens the spectrum, making true signal features like alpha or beta peaks more visible. Results were then converted to decibels (dB) for easier comparison across channels and conditions.

In each graph, the solid colored lines show the average power from 0–40 Hz. Grey shading indicates frequencies with statistically significant differences between the two conditions.