کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4188034 | 1608231 | 2006 | 13 صفحه PDF | دانلود رایگان |
BackgroundThe aim of this study was to assess working memory (WM) in patients with major depressive disorder (MDD), using a robust parametric WM task (the n-back task).MethodsTwenty patients with MDD and twenty healthy controls completed a visual version of the paradigm, comprising four levels of task difficulty (i.e. 0-, 1-, 2-, and 3-back). Performance accuracy and reaction time (RT) were measured at each difficulty level.ResultsIn comparison with controls, patients with MDD exhibited slower RTs (F(1,38) = 25.16, p < 0.001), and reduced accuracy (F(1,38) = 5.93, p < 0.001). There was no diagnosis-specific effect of task difficulty on performance accuracy. However, the faster response to memory (1–3-back) than to shadowing (0-back) tasks observed in controls was not as pronounced in patients.ConclusionsThese observations support a relatively specific impairment of WM/central executive function in MDD, which may potentially mediate the diverse pattern of cognitive dysfunction noted in MDD. The parametric n-back task is applicable to subjects with MDD and yields results interpretable across the dimensions of task difficulty and performance in controls and patients.
Journal: Journal of Affective Disorders - Volume 90, Issues 2–3, February 2006, Pages 149–161