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Purpose of ReviewMajor depressive disorder (MDD) is a pervasive and debilitating mental illness, associated with significant emotional, social, and functional deficits. Growing evidence suggests that cognitive dysfunction is a core feature of MDD, and may negatively interact with other clinical features of the illness (e.g., psychosocial dysfunction, illness onset). We review recent advances in our understanding of cognitive dysfunction in MDD and highlight the putative causes and effects of cognitive deficits in depressed patients. Recent FindingsRecent findings in this domain point to a multifaceted pathology of cognitive deficits in MDD, with behavioural disengagement and chronic low-grade inflammation likely playing an antecedent role. Emerging evidence suggests an independent role for cognitive deficits in the development of psychosocial dysfunction, particularly in domains of occupational function, interpersonal relationships and quality of life.

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