Anxiety and depression are highly prevalent and disabling conditions that frequently co-occur, and are costly to the individual and society. Despite important advances in our understanding of these disorders, there is a significant unmet need to identify reliable and clinically useful tests that can predict prognosis, inform treatment choice for a given individual, and improve treatment outcomes. The aim of this project is to fill this critical gap by validating a battery of measures including brain imaging, psychophysiology, behavior, and self-report that will reliably assess positive and negative affect, or valence, system functioning in a broad sample of individuals screened for anxiety and depression as part of their routine primary care visits.