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Charles Darwin proposed certain ideas about evolution and the origin of species by means of natural selecton.

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William Wundt established the first psychological laboratory at the university in Leipzig, Germany. He emphasized the importance of "empirical" research of the conscious human mind and the laws that govern it.

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A dispute arose in the 1890s between structuralists and functionalists in the U.S. that illustrates the differences between the two. The general topic of the dispute was the various mental processes in adaptation.

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John B. Watson was most associated with the first phase of the behavioral movement. He is credited as the first to use the terms behaviorism and behaviorist., and established the term S-R behaviorism.

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B.F. Skinner began introducing his ideas to the field of behavior analysis and developed his work on radical behaviorism to become the philosophy of science underlying behavior analysis.

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R.S. Woodworth proposed and S-O-R formulation and explained how behavior and consciousness were both the subject matter of psychology.

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This book explained and argued the systematic approach to the study of behavior as a subject matter in its own right, rather than as an index to physiology or the mental.

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1980- Psychology, physiology, and philosophy

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1980- Psychology, physiology, and philosophy

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Psychology, physiology, and philosophy all show influences on the development on behaviorism throughout the 20th century.

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The four domains of behavior analysis include (a) experimental, (b) applied, (c) radical, and (d) service delivery (Hawkins & Anderson, 2002).

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The field of behavior analysis continues to grow with the inclusion of other field's methods and practices. The evolution of our field embraces behavioral relations at the level of phylogeny, ontogeny, and the culture. It employs the observational methods of natural science, supplemented with interpretive extensions based on demonstrated behavioral principles.