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.
Physiological psychology, neuroscience, psychoneuroimunology and psychopharmacology are all part of the biological perspective. Because the biological perspective relies on scientific methods, its scope of investigation is limited to variables that can be controlled.