This document provides an overview of the foundations and early influences that shaped the development of psychology. It discusses key figures like Wundt, James, Freud, and Skinner who established schools of thought in structuralism, functionalism, psychoanalysis, and behaviorism. The document also outlines the major perspectives that currently characterize the field, including psychodynamic, behavioral, cognitive, humanistic, biological, evolutionary, sociocultural, and biopsychosocial approaches. Each perspective focuses on different aspects of behavior and mental processes, from unconscious desires to learning and environment to biology and culture.