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- William Wundt first psychological laboratory & concept of introspection (structuralism).
- William James wrote "The Principles of Psychology", discussed functionalism.
- Ideas do not have much impact on how psychologists think today.

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- Max Wertheimer focused not on how we feel, but how we experienced the world.
- Whole of experience can be more than sum of it's parts.

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- Wave started with Sigmund Freud (early 1900's)
- Believed most of your feelings came from unconscious.
- We protect ourselves from real feelings by using defense mechanisms.

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- Mid 1900's, people started to ignore how you feel inside. All that mattered was how you acted. If you could change your behavior, who cares how you feel?
- Conservative 1950's, social appearance mattered more than self expression.

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- Variety.
- Psychologist picks and chooses what waves to use depending on situation and client