Neuropsychology is a branch of psychology that studies how the brain affects behavior and cognitive functions. It explores the relationship between brain structures and processes, helping us understand how injuries or diseases can impact memory, emotions, and decision-making. By examining patients with brain injuries or disorders, neuropsychologists can identify specific areas of the brain responsible for different functions. This field combines knowledge from both psychology and neuroscience, making it essential for diagnosing and treating conditions like Alzheimer's disease or traumatic brain injury. Neuropsychologists often use tests to assess cognitive abilities, guiding rehabilitation and improving patients' quality of life.