1. Laboratory of Cognitive and Computational Neuroscience, Center of Biomedical Technology, Madrid, Spain
2. Department of Basic Psychology II, Complutense University of Madrid, Spain
3. Department of Applied Physics III of Complutense University of Madrid, Spain
4. Department of Geriatrics (Memory Unit), San Carlos University Hospital, Madrid, Spain
5. Department of Basic Psychology I, Complutense University of Madrid, Spain
6. Electrical Engineering and Bioengineering Group, Dept. of Basic Physics, University of La Laguna, Tenerife, Spain