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.
psychological. 1  of or relating to psychology. 2  pertaining to the mind or to mental phenomena as the subject matter of psychology. 3  of, pertaining to, dealing with, or affecting the mind, especially as a function of awareness, feeling, or motivation: psychological play; psychological effect.