 The duration of the administration of the test battery is approximately 35 minutes. At 3 months and 1 year from the surgical proceduregeneral anesthesia or from baseline evaluation in the Control group the same test battery will be repeated. In those tests having a parallel version, the parallel version will be administered, in order to reduce the learning effect. The difference in scores of the tests performed at 3 months and 1 year and baseline, corrected for the mean difference observed in the Control group in the same timeframe, will be used in order to define the occurrence of POCD. 