Efficacy of Vortioxetine on Cognitive Dysfunction in Patients With Partial or Full Remission of Major Depressive Disorder

Inclusion Criteria: * The patient has achieved either partial (some symptoms of a MDE are present but full criteria are not met) or full remission of major depressive disorder (MDD), diagnosed according to DSM-IV-TR™. * The patient has HAMD-17 total score ≤10. * The patient has received SSRI monotherapy for the MDE from which the patient is currently in full or partial remission for ≥12 weeks at licensed doses and been on stable dose ≥8 weeks prior to Screening Visit. * The patient has ≥50% response to current SSRI treatment (Antidepressant Treatment Response Questionnaire \[ATRQ\]). * The patient has a PDQ-D total score \>25. * The patient is a man or woman, aged ≥18 and ≤65 years. Exclusion Criteria: * The patient has a score ≥70 on the DSST (numbers of correct symbols) at the Baseline Visit. * The patient is, in the opinion of the investigator, not able to complete the neuropsychological tests validly at the Baseline Visit. * The patient has physical, cognitive, or language impairment of such severity as to adversely affect the validity of the data derived from the neuropsychological tests. * The patient is diagnosed with reading disability (dyslexia). * The patient has a history of lack of response to previous adequate treatment with vortioxetine. * The patient has any current psychiatric disorder or Axis I disorder (according to DSM-IV-TR™ criteria) other than MDD, as assessed using Mini International Neuropsychiatric Interview (MINI). * The patient has a current or has had a diagnosis of dysthymic disorder within 3 months preceding the onset of the depressive episode from which the patient is currently in full or partial remission (DSM-IV-TR™ criteria). * The patient has borderline, schizotypal, schizoid, paranoid, histrionic, antisocial personality disorders (axis II) as comorbid or primary diagnosis (DSM-IV-TR™ criteria). * The patient suffers from personality disorders, mental retardation, pervasive development disorder, attention-deficit/hyperactivity disorder, organic mental disorders, or mental disorders due to a general medical condition (DSM-IV-TR™ criteria). * The patient has a current diagnosis or history of manic or hypomanic episode, schizophrenia or any other psychotic disorder, including major depression with psychotic features (DSM-IV-TR™ criteria). Other protocol-defined inclusion and exclusion criteria may apply.