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 CHILD PSYCHOLOGY. : the study of the psychological characteristics of infants and children and the application of general psychological principles to infancy and childhood.What made you want to look up child psychology? the study of the psychological characteristics of infants and children and the application of general psychological principles to infancy and childhood. What made you want to look up child psychology?