Like other social scientists, psychologists collect and test the validity of data and formulate hypotheses. Research methods depend on the topic under study. Computers are widely used to record and analyze this information. Psychologists usually specialize. Personality psychologists study human nature, individual differences, and the ways in which those differences develop.
Comparative psychologists study the behavior of humans and lower animals.
Physiological psychologists study the relationship of behavior to the biological functions of the body. Psychologists in the field of psychometrics develop and apply procedures for measuring psychological variables such as intelligence and personality. Clinical psychologists generally work in hospitals or clinics, or maintain their own practices. They help the mentally or emotionally disturbed adjust to life. Clinical psychologists may collaborate with physicians and other specialists in developing treatment programs.