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From top to bottom, the ERS, ITC and ERP triggered by the checkerboard (A , C , E) and by the 3D-tunnel pattern (B , D , F). The triggers (vertical dashed lines) were given at time zero. The stars indicate stronger ERS in the upper alpha band (∼15 Hz) followed by a stronger ERD at about 200 ms in the upper alpha band (∼15 Hz) with respect to the checkerboard pattern.
