POST-MOVEMENT BETA-OSCILLATIONS STUDIED WITH LINEAR-ESTIMATION

The application of surface laplacian and linear estimation methods to single trial EEG data was studied. EEG was recorded in 3 subjects duri ng voluntary, self-paced extensions and flexions of the index finger. In each subject a post-movement beta synchronisation was found in spec ific frequency bands. The surface laplacian estimates were calculated using spherical splines and cortical current distributions were constr ucted using the linear estimation method. Both methods yield similar r esults and reveal a maximal event-related synchronisation over the lef t sensorimotor area approximately 500-750 ms after termination of move ment. (C) 1998 Elsevier Science Ireland Ltd.