The platysma changes the facial expression which plays an important role in human social behavior. In elderly people â when the skin increasingly loses its elasticity â both inner faces of the platysma form two longitudinal wrinkles on the neck.
Biological psychology is a branch of psychology that studies the physiological causes of behavior. This field is sometimes referred to as behavioral neuroscience or biopsychology.
A forensic psychologist, also sometimes called a criminal psychologist, is someone who studies the actions and motivations of people who have broken the law. Sometimes these professionals work directly with criminals to help rehabilitate them or help them identify patterns in their own behavior.