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His personality changed due to the injury, which changed our understanding of the brain.

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1861- Paul Broca discovered an area in the left frontal lobe that is key to language development

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1861- Paul Broca discovered an area in the left frontal lobe that is key to language development

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This new discovery supported the idea that language functions are located in the dominant hemisphere of the brain.

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1879- Wilhelm Wundt founded the first formal laboratory of psychology

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1879- Wilhelm Wundt founded the first formal laboratory of psychology

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This marked psychology as an independent field of study.

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1883- The first laboratory of psychology is set-up at John Hopkins University

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1883- The first laboratory of psychology is set-up at John Hopkins University

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At this time, psychology wasn't taken as seriously and wasn't viewed as a consequential area of study.

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1890- William James publishes "Principles of Psychology," the first psychology textbook

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1890- William James publishes "Principles of Psychology," the first psychology textbook

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The book took the information known at the time about the localization of the functions in the brain.

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1894- Margaret Floy Washburn becomes the first woman to earn a Ph.D in psychology

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1894- Margaret Floy Washburn becomes the first woman to earn a Ph.D in psychology

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She served as an example that women can effectively contribute to the field of psychology.

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1897- Ivan Pavlov publishes the first study about Classical Conditioning

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1897- Ivan Pavlov publishes the first study about Classical Conditioning

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Pavlov demonstrates that animals could be conditioned to drool if they heard a certain sound.

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1897- Sigmund Freud publishes, "The Interpretation of Dreams"

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1897- Sigmund Freud publishes, "The Interpretation of Dreams"

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It created groundbreaking theories for dreams and new innovative ways to interpret those dreams.

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1898- Edward Thorndike published his first article on animal intelligence, eventually leading to the theory of Operant Conditioning

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1898- Edward Thorndike published his first article on animal intelligence, eventually leading to the theory of Operant Conditioning

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It led to behaviorism as well as many other theories and laws.

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1912- William Stern developed a formula for the Intelligence Quotient (IQ) 

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1912- William Stern developed a formula for the Intelligence Quotient (IQ) 

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It would go on to help assist diagnosing children and adults, as well as helping with education placement.

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1913- John B. Watson published, "Psychology as the Behaviorist Views It"

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1913- John B. Watson published, "Psychology as the Behaviorist Views It"

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The focus on the book was around the prediction and control of behavior.

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1923- Jean Piaget published "The Language and Thought of a Child"

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1923- Jean Piaget published "The Language and Thought of a Child"

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It led to great insights on how adults process knowledge and create new understanding.

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1938- B.F. Skinner published "The Behavior of Organisms"

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1938- B.F. Skinner published "The Behavior of Organisms"

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Set the parameters for the discipline that would eventually be called experimental analysis of behavior (EAB) and Behavior Analysis.

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1943- Abraham Maslow founded the Humanistic Perspective of Psychology

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1943- Abraham Maslow founded the Humanistic Perspective of Psychology

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It promotes growth through heightened awareness and self-understanding, body/mind integration and a focus on well-being.

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1945- Karen Horney proposed the social-cultural perspective 

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1945- Karen Horney proposed the social-cultural perspective 

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Her book was built on the theory that social culture conditions, especially childhood experiences, play a big role in shaping personality.

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1950- Erik Erickson published, "Childhood and Society"

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1950- Erik Erickson published, "Childhood and Society"

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One of the first to show how Sigmund Freud's theory of infantile sexuality could be broadened.

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1953- The Code of Ethics for Psychologists is created by the American Psychological Association

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1953- The Code of Ethics for Psychologists is created by the American Psychological Association

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The Ethics Code provides a common set of principles and standards, which psychologists build their professional and scientific work on.

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1961- Carl Rogers published "On Becoming a Person"

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1961- Carl Rogers published "On Becoming a Person"

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He developed a theory called Unconditional Positive Regard. He believed that children learn through unconditional acceptance and understanding.

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1983- Howard Gardner introduced his theory on Multiple Intelligence 

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1983- Howard Gardner introduced his theory on Multiple Intelligence 

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It changed the way people study intelligence and transformed the fields of psychology and education.

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It's important, because it contains the most up-to-date criteria for diagnosing mental disorders.