Brain volumes refer to the measurements of the size and volume of different regions in the brain. This area of research involves using imaging techniques such as magnetic resonance imaging (MRI) to measure the volume of various brain structures, such as the gray matter, white matter, and specific regions like the hippocampus or amygdala. Changes in brain volumes have been linked to various neurological and psychiatric conditions, including Alzheimer's disease, schizophrenia, and depression. Studying brain volumes can help researchers better understand the underlying mechanisms of these disorders and potentially develop new treatments or interventions.