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To characterize neuropsychological deficits during the euthymic phase in a sample of bipolar outpatients treated with lithium as the principal mood-stabilizer medication. We sought to determine cognitive functioning of typical bipolar outpatients treated in clinical settings. Forty-four stable outpatients, fulfilling criteria of bipolar disorder (DSM-IV), were consecutively recruited from a defined catchment area and compared with 46 healthy matched controls in 2003. Patients were remitted for at least 3 months and euthymic (Hamilton Rating Scale for Depression score< 8 and Young Mania Rating Scale score< 6 for at least 3 months). They were receiving lithium as monotherapy (45.5%) or combined with other psychotropic medication (54.5%). Neuropsychological assessment was performed by means of a neuropsychological test battery tapping into the main cognitive domains (executive function …