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William Wundt's idea of structuralism started this concept. The Principles of Psychology was then written by William James talking about functionalism.

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Introspection is the examination of a persons mental state, and it may refer to a persons soul in a spiritual context.

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Wave one, introspection, is the study of a persons mental thoughts like feelings and thoughts.

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There was a group led by Max Wertheimer which focused on how people experience the world and they did not focus on how people felt. These experiences are more too the brain than the sum of its parts.

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Gestalt Psychology was a movement which mainly focused on perceptions in terms of gestalts.

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Wave two, Gestalt Psychology, is the focus on experiences that people have, that might be contributing to their behaviors rather than looking at emotion.

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In the early 1900's people believed that some of your feeling were being hidden in the unconscious part of your brain. Sigmund Freud started this thinking that in order to protect ourselves we had defense mechanisms from our real feelings.

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Psychoanalysis is a theory created to help treat mental disorders. They do this b looking at the conscious and unconscious parts of the brain.

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Wave three, Psychoanalysis, is a way to treat mental disorders by using the brains conscious and unconscious parts as a form of therapy.

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In the 1950's it was more important how you acted than how you feel on the inside. People relied more on social appearance than feelings.

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Behaviorism was the theory that behavior can be figured out by actions rather than thoughts and feelings.

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Wave four, behaviorism, is a way to control behaviors by putting people in a new environment, as a means to correct a psychological disorder.

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Depending on the problem psychologists pick and choose theories for the client.

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Eclectic is an approach that involves principles and philosophies in order to create the correct treatment for the patient.

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Wave five, Eclectic, is a therapy strategy to help decide what is best for the client and their situation.