Fig. 4
From: Control of cortical oscillatory frequency by a closed-loop system
Experimental protocol. Left, initial open-loop characterization part: top left, profile of the applied current. Stimulation phases last 60 s. Current levels span the [− 0.6 + 0.6] mA range with 0.1-mA steps. There were 20 s between successive stimulation phases. Right, closed-loop part: bottom right, profile of the desired target SO frequency. A stimulation pause of 40 s was enforced after every set of three targets (0.5, 0.1 and 0.8 Hz)