Explore the foundational theories that shape our understanding of the human mind
Key milestones in the development of psychological science
Wilhelm Wundt establishes the first experimental psychology laboratory in Leipzig, Germany, marking the birth of psychology as a scientific discipline.
William James publishes "The Principles of Psychology," establishing functionalism and exploring the stream of consciousness.
Sigmund Freud publishes his seminal work, introducing psychoanalysis and the concept of the unconscious mind.
John B. Watson publishes "Psychology as the Behaviorist Views It," shifting focus to observable behavior.
The cognitive revolution begins, emphasizing internal mental processes and information processing models.
Martin Seligman introduces positive psychology, focusing on human strengths and flourishing.
Sigmund Freud
Emphasizes the influence of the unconscious mind on behavior. Key concepts include the id, ego, superego, defense mechanisms, and psychosexual development.
B.F. Skinner, John Watson
Focuses on observable behavior and how it's shaped by environmental stimuli through conditioning and reinforcement.
Jean Piaget, Ulric Neisser
Studies mental processes including attention, memory, perception, problem-solving, and decision-making.
Carl Rogers, Abraham Maslow
Emphasizes human potential, free will, and the pursuit of self-actualization and personal growth.
Donald Hebb
Examines how biological processes, brain structures, and neurochemistry influence behavior and mental processes.
Kurt Lewin, Solomon Asch
Explores how social interactions, group dynamics, and social influences shape individual behavior and attitudes.
The conscious mind contains everything we are aware of, while the unconscious holds memories, desires, and experiences that influence our behavior without our awareness. Freud believed the unconscious mind is the primary source of human behavior.
This debate addresses whether behavior is determined by genetics (nature) or environment and experience (nurture). Modern psychology recognizes that both factors interact complexly to shape who we are.
Discovered by Ivan Pavlov, classical conditioning is learning through association. A neutral stimulus becomes associated with a meaningful stimulus and acquires the capacity to elicit a similar response.
Leon Festinger's theory states that we experience psychological discomfort when holding conflicting beliefs or when our actions contradict our beliefs. We are motivated to reduce this dissonance.
Abraham Maslow proposed that human needs are arranged in a hierarchy: physiological, safety, love/belonging, esteem, and self-actualization. Lower-level needs must be satisfied before higher-level needs motivate us.
1971 - Philip Zimbardo
Demonstrated the powerful effect of situational forces on behavior, as participants assigned as "guards" became abusive while "prisoners" became submissive.
1963 - Stanley Milgram
Revealed that ordinary people would administer what they believed were dangerous electric shocks to others when instructed by an authority figure.
1951 - Solomon Asch
Showed that individuals would conform to group opinions even when the group was clearly wrong, demonstrating the power of social pressure.
1961 - Albert Bandura
Demonstrated that children learn aggressive behaviors through observation and imitation, supporting social learning theory.
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