Background: Only few studies have investigated executive impairment in the euthymic phase of unipolar affective disorders, yielding diverging results. The role of impulsivity/orbitofrontal associated executive functioning in remitted depression has not yet been examined.
Methods: Partly remitted male out-patients (n = 15) with non-psychotic major depression (MDD) were compared with healthy males (n = 15) on several neuropsychological tests. Executive tasks focussed on orbitofrontal function (Go/No-Go, Iowa Gambling Task (IGT), delayed alternation task). Furthermore, the Barratt Impulsiveness Scale (BIS-11) was administered to all subjects.
Results: Executive skills of the patients were largely unimpaired. Patients exhibited significant deficits on measures of verbal memory only. Residual depressive symptoms in patients were correlated with diminished response inhibition. BIS-11 scores were not elevated in the patients.
Conclusions: Both executive impairment related to orbitofrontal function and self-reported impulsive behaviour in major depression seem to be state-dependent. In accordance with other studies, patients with remitted unipolar depression showed a persistent verbal memory loss.