Opposing cortical forces: Alpha slowing and sensorimotor mu acceleration during motor-related BCI training
Fig 7
Slope maps of EKF-estimated (a) frequency (top row) and (b) magnitude (bottom row) changes across a wide range of bandpass filtered frequency bands, averaged over central EEG channels (i.e., Ci) and participants.
Columns correspond to different datasets (Schalk2004, Dreyer2023, Schwarz2020 and Pulferer2022 from left to right). Each pixel represents the mean slope (in Hz/hour) for a specific band defined by [fmin, fmax]. Positive slopes (red) indicate rising frequencies, while negative slopes (blue) indicate decreasing trends. Green boxes highlight the frequency bands selected to generate the topographical maps of Fig 3.