Detection of the onset of upper-limb movements based on the combined analysis of changes in the sensorimotor rhythms and slow cortical potentials J. Ib´ a˜ nez 1 , J.I. Serrano 1 , M.D. del Castillo 1 , E. Monge 2 , F. Molina 2 , I. Alguacil 2 , J.L. Pons 1 1 Bioengineering Group, Spanish Research Council (CSIC), Arganda del Rey, Madrid E-28500 2 LAMBECOM, Universidad Rey Juan Carlos, Alcorc´ on, Madrid, Spain E-mail: jaime.ibanez@csic.es