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Comment :

Type  MGI:General Description  during NREM, EEG shows reduced power spectral density in the sigma range, with a maximal difference of 11 Hz, reduced sigma (11-15 Hz) band relative power, increased power at lower frequencies, in particular delta range (3-5 Hz) the increase in NREM delta frequency is also present during REM, as is the decrease in sigma power, although to a lesser extent