Parietal, Inria, Saclay, France.|Parietal, Inria, Saclay, France.|Psychology department, Stanford University, Stanford, CA 94305, USA.|Neurospin, CEA, Gif sur Yvette, France.|Parietal, Inria, Saclay, France.|Montreal neurological Institute and Hospital, McGill University, Montreal, Canada.|Parietal, Inria, Saclay, France.