Figure 4: Topographic maps of motor task-related signal power changes.
From: In vivo assessment of human brain oscillations during application of transcranial electric currents
Absolute signal power changes (0.5–30 Hz) during self-paced left index finger button presses across participants in the absence of stimulation (a) and during electric stimulation (b). Note the stimulation artefacts (dark red) superimposing task-related neuromagnetic motor cortex activity in the centro-parietal sensor space (white dotted circle).
