The authors which to extend special thanks to frank Matthies (University of osnabruck, Germany) for his great help which the statistical analysis. Our thanks also to Dr.Julion Bourne of the University of Granada for translating the original Spanish manuscript into English. This research has been financed by the research Project "Variables psicologicasy psicosociales relacionadas con la plasticidadyel declive cognitive enancianos con deterioro cognitive level" (BSO 2002-01 561) of the Spanish Ministry of Science and Technology.