Abstract: A system for measuring EEG signals, comprises a wearable body adapted to fit over a scalp, a plurality of electrodes mounted on the wearable body, and optionally also a plurality of controllable actuators for applying force to the electrodes. A controller optionally controls each actuator or group of actuators to apply force to at least one electrode. A signal processor receives and processes signals from the electrodes and optionally transmits control signals to the controller based on the processing.