Assessment of cognitive domains in major depressive disorders using the Cambridge Neuropsychological Test Automated Battery (CANTAB): Systematic review and meta-analysis of cross-sectional and longitudinal studies.

Summary: Depression is often thought of as a disorder of mood, but a new comprehensive review confirms it deeply affects the mind's ability to think, plan, and remember. Researchers analyzed data from over 3,000 participants using the CANTAB—a specialized computer test for brain function. They found that people with Major Depressive Disorder struggle significantly with executive functions (planning and problem-solving), memory, and attention span compared to healthy individuals. While standard depression treatments helped improve some specific areas—like pattern recognition and problem-solving speed—many cognitive difficulties persisted. This suggests that treating the mood alone isn't enough; doctors need to develop targeted therapies to help clear the "brain fog" and restore full mental sharpness.