Psychophysiology is the study of the relationship between psychological processes and physiological responses. It examines how mental states, such as emotions and thoughts, can influence bodily functions, including heart rate, blood pressure, and hormone levels. Researchers in this field often use tools like electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) to measure brain activity and its effects on the body. This discipline helps to understand how stress, anxiety, and other psychological factors can impact physical health. By exploring these connections, psychophysiology contributes to fields like health psychology and clinical psychology, providing insights that can improve mental and physical well-being.