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The biological approach to psychology, also known as neuropsychology, is one of many approaches used to explain human mental processes and behavior. Neuropsychologists are psychologists that examine mental processes and behavior using a biological approach.
If levels in the brain are low, a patient can become depressed (or anxious). If the reason for depression is biological, medication is required. The Biological Perspective in Psychology is based on genetics, and the chemical activity/amounts in the brain and body. It also includes hereditary factors.