231) Sigmund Freud argued that many of his patients’ symptoms had mental, not physical, causes. 232) Sigmund Freud argued that many of his patients’ symptoms had undiagnosed physical causes rather than mental causes. 233) Early psychologists who emphasized how behaviour helps an organism adapt to its environment were known as functionalists. 234) Early psychologists who emphasized how behaviour helps an organism adapt to its environment were known as structuralists. 235) Early psychologists who emphasized how behaviour helps an organism adapt to its environment were known as psychoanalysts. 236) Freud’s first book, The Interpretation of Dreams, was an overnight sensation that went through five printings in only eight years. 237) Freud’s first book, The Interpretation of Dreams, sold only 600 copies in the eight years following its publication. 238) Freudian concepts were, and still are, rejected by most empirically oriented psychologists. 239) Freudian concepts are accepted by most empirically oriented psychologists. 240) The biological perspective is an approach that emphasizes bodily events and changes associated with actions, feelings, and thoughts.