"Gamma wave" . "low gamma" . "gamma wave" . "gamma-band" . "gamma oscillation" . . "gamma oscillations" . . . "gamma range" . . . "gamma rhythms" . . "gamma band" . . "Gamma" . "Gamma wave" . . "gamma frequency range" . . "gamma activity" . "Gamma oscillations" . . "gamma" . "high gamma" . . "gamma-oscillations" .