Figure 5. Head movements with prolonged stimulation.

Responses for five subjects of lateral head displacement during sustained GVS at 0.5 mA. The response of each subject is shown relative to its own baseline, zeroed at the point of stimulus onset. After onset, the stimulus is applied for the entire duration shown, which varied slightly between subjects. For each subject, after an initial movement in the direction of the anode, a movement commences that oscillates between a baseline that is displaced approximately 20 mm from the start position with a limit at approximately 40 mm.