Psychology is the study of the mind and behavior, according to the American Psychological Association. The APA adds that it “embraces all aspects of the human experience, from the functions of the brain to the actions of nations, from child development to care for the aged.”Click to see full answer. Consequently, what does APA mean in psychology? American Psychological Association Likewise, what defines a psychologist? A psychologist is someone who studies the mind and behavior. While people often think of talk therapy when they hear the word psychologist, this profession actually encompasses a wide range of specialty areas including such things as animal research and organizational behavior. In this regard, what is the best definition of psychology? Psychology is the scientific study of the mind and behaviour, according to the American Psychological Association. Psychology is a multifaceted discipline and includes many sub-fields of study such areas as human development, sports, health, clinical, social behaviour and cognitive processes.What is the main purpose of the APA?The primary purpose of APA style is to facilitate scientific communication by promoting clarity of expression and by standardizing the organization and content of research articles and book chapters.