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.
Medical Definition of psychometrician. 1  1: a person (as a clinical psychologist) who is skilled in the administration and interpretation of objective psychological tests. 2  2: a psychologist who devises, constructs, and standardizes psychometric tests.