sentence: We included patients who had : ( 1 ) preoperative HD ‐ EEG and MEG recordings ; ( 2 ) long ‐ term icEEG monitoring with subdural electrodes and sampling frequency ≥ 600 Hz ; ( 3 ) follow ‐ up after ≥ 1 year ; and ( iv ) postimplantation computerized tomography ( CT ) , preoperative , and postoperative MRI .