Performance during the SOC and WCST in patients (n = 22) and healthy subjects (n = 20) SOC: I a. Adjusted planning time during easy and difficult problems, I b. Movement execution time, I c. Average moves above minimum, WCST: II a. Number of categories and percentage of perseverative errors (%pe), II b. Reaction time (RT) during maintaining set and set shifting. Abbreviation: c.s.: category shift. *P < 0.05, **P < 0.01, ***P < 0.001.