Figure 11.

Experimental setups and protocols. (A) Experimental setup showing a subject walking on a treadmill. (B) In this experiment, we simultaneously collected data from various devices: EEG signals from the scalp (actiCap, BrainProducts GmbH, Germany), EEG signals from around the ear (cEEGrid, TMSi, USA), forehead IMU signals (APDM, APDM wearable technologies, USA), and from the treadmill. (C) Channel labels: 32 scalp-EEG electrodes, 3 EOG electrodes, and 6 IMU sensors. (D) The experimental paradigm was executed with target (“OOO”) and non-target (“XXX”) characters. The ratio of targets was 0.2 and the number of total trials was 300. In a trial, a stimulus was presented for 0.5 s followed by the cross symbol indicating a random rest period lasting 0.5–1.5 s.