Definition: Electro-physiology is a scientific discipline that focuses on the functions of the human nervous system and its response to various stimuli, such as electrical signals from external sources or chemical substances in the body. It involves the investigation and analysis of the structure, function, and interactions between the brain, nerves, muscles, and other bodily systems. The word "electro-physiology" is derived from the German words "Electrodynamik," which means "electromagnetism," and "Physik." The term is used to describe any study that involves the examination of the function, structure, and response of the body's electrical system, or the brain and nervous system. The definition of "electro-physiology" includes a thorough exploration of how the human body responds to electrical signals, including both external sources like lightning or electromagnetic fields (EMFs) and internal signals such as heartbeats or breathing. The study often involves using various techniques such as MRI scans, nerve conduction studies, biofeedback devices, and other monitoring equipment. The field has been important in advancing our understanding of human behavior and the impact of neurological disorders on physical function, but it is also used to understand diseases like Alzheimer's disease and epilepsy. Electro-physiology is crucial for researchers, clinicians, educators, and policymakers working in fields related to neuroscience, medicine, and psychology.