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The long-term effect of PBM stimulation on the power spectrum when alpha and theta bands are observed. The figures show the power ratios between the r2 after stimulation and the r1 before stimulation. (a) shows the power ratios for the alpha band at OE, while Figure (b) shows the power ratios at CE. (c) presents the power ratios for the theta band at OE, while (d) is for CE.
