Power modulation of electroencephalogram mu and beta frequency depends on perceived level of observed actions.

The difference between perception levels in the low alpha range (8–10 Hz) was found significant in the left occipital site and marginally significant at the right occipital site (Md ± SEM = −0.34 ± 10 −3 dB, t (16) = 1.86, P < 0.05 in O1 and −0.26 ± 0.07 dB, t (16) = 1.36, P = 0.09 in O2) (Fig. 4 ).

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