Primary outcome is the performance in several neuropsychological assessments as well as the results of several self-rating questionaires. Assessments will take place before and after the intervention and the controll interval; respectively.The neuropsychological tests comprise:- testset COGBAT from Vienna Testing System- California Verbal Learning and Memory Test- Regensburger Wortflüssigkeitstest- Mosaiktest from the WAIS-IVThe questionaires comprise:- Fatigue Severity Scale- Fatigue Skala für Motorik und Kognition- Brief Symptom Checklist- Beck Depression Inventar II- Marburger Kompetenzskala- Montgomery Asberg Depression Rating Scale

Primary outcome is the performance in several neuropsychological assessments as well as the results of several self-rating questionaires. Assessments will take place before and after the intervention and the controll interval; respectively.The neuropsychological tests comprise:- testset COGBAT from Vienna Testing System- California Verbal Learning and Memory Test- Regensburger Wortflüssigkeitstest- Mosaiktest from the WAIS-IVThe questionaires comprise:- Fatigue Severity Scale- Fatigue Skala für Motorik und Kognition- Brief Symptom Checklist- Beck Depression Inventar II- Marburger Kompetenzskala- Montgomery Asberg Depression Rating Scale