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. This field combines principles from psychology and physiology to understand how the mind and body interact. Researchers in psychophysiology often use various methods, such as electroencephalography (EEG) and heart rate variability (HRV) monitoring, to measure these interactions. Findings in this area can help in understanding conditions like stress, anxiety, and depression, and can inform treatments that address both mental and physical health.