Mental Task Evaluation for Hybrid NIRS-EEG Brain-Computer Interfaces
ERD/ERS maps for each task in the low , high , low , and high bands. ERD/ERS values are computed using the intertrial variance method  over the time window spanning 0.5 to two seconds after stimulus onset, using a baseline of −2 to 0 seconds before trial onset. Blue represents ERS while red represents ERD. Note that color ranges differ between power bands.