**3.4 Sustained attention test** *Quatember & Maly* **(Fig. 7)**

With the computerized sustained attention "Clock test" of Quatember and Maly (Wiener Testsystem TM, Schufried, Austria 1994; modified for Task force *Vigilance* and *SIESTA group* of DGSM2) the sustained attention will be evaluated under monotone conditions and the processing diligence will be measured in the kind of errors and reaction times over a period of 60 minutes. There are two types of errors: missed and incorrect (delayed) responses reactions. Patients are instructed to press a key on the computer keyboard when the "moving point" in a points circle one point skips. At the beginning of the test will be started shortly to introduce the circular arrangement of points. During implementation, the patients sit in a relaxed position ca. 60-80 cm in front of the screen in a semi-darkened room.
