Fig. 3
From: Auditory stimulation at individual gamma frequency enhances cognitive performance
Acoustic properties of the Gamma Keyboard (A) and Control Keyboard (B). For each stimulus, the panels show: (Top) a partial waveform over time, (Middle) the frequency spectrum, which illustrates the musical pitch content, and (Bottom) the envelope frequency spectrum, which illustrates the rhythm of the volume modulation. The distinct peak at the target frequency in the bottom panel of (A) represents the embedded gamma stimulation, which is absent in the control stimulus (B).
