GAMMA WAVE By N., Pam M.S. - May 11, 2013 Electroencephalography. Type of brain wave that tends to be irregular, low in amplitude, fast, ranging from 20 to 70 Hz and with power peaking near 40 Hz. Seen during mental processing. GAMMA WAVE: "Gamma waves reflect active mental processes." Related Psychology Terms KAPPA WAVE SPIKE-AND-WAVE DISCHARGES BETA WAVE STAGE 4 SLEEP STAGE 3 SLEEP SYNCHRONIZATION DELTA WAVE BRIGHTNESS AMPLITUDE OF LIGHT WAVE STAGE 1 SLEEP Cite this page: N., Pam M.S., "GAMMA WAVE," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/gamma-wave/ (accessed February 18, 2020).