In Christopher Fox, Roy Porter & Robert Wokler (eds.), Inventing Human Science: Eighteenth Century Domains. University of California Press. pp. 184–231 (1995)

Gary Hatfield
University of Pennsylvania
Psychology considered as a natural science began as Aristotelian "physics" or "natural philosophy" of the soul, conceived as an animating power that included vital, sensory, and rational functions. C. Wolff restricted the term " psychology " to sensory, cognitive, and volitional functions and placed the science under metaphysics, coordinate with cosmology. Near the middle of the eighteenth century, Krueger, Godart, and Bonnet proposed approaching the mind with the techniques of the new natural science. At nearly the same time, Scottish thinkers placed psychology within moral philosophy, but distinguished its "physical" laws from properly moral laws. British and French visual theorists developed mathematically precise theories of size and distance perception; they created instruments to test these theories and to measure visual phenomena such as the duration of visual impressions. By the end of the century there was a flourishing discipline of empirical psychology in Germany, with a professorship, textbooks, and journals. The practitioners of empirical psychology at this time typically were dualists who included mental phenomena within nature. Accordingly, psychology as a natural scientific disciplines was not invented in the 18th and 19th centuries, but *remade* from the extant empirical psychology
Keywords Psychology as a natural science  Idea of a natural science  Psychology in 17th century  Psychology in 18th century  Christian Wolf  Charles Bonnet  Guillaume-Lambert Godart  Johann Gottlob Krueger  David Hartley  Joseph Priestley
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The Absence of Psychology in the Eighteenth Century: A Linguistic Perspective.Graham Richards - 1991 - Studies in History and Philosophy of Science Part A 23 (2):195-211.

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Animals.Gary Hatfield - 2008 - In Janet Broughton & John Carriero (eds.), Companion to Descartes. Blackwell. pp. 404–425.
The Passions of the Soul and Descartes’s Machine Psychology.Gary Hatfield - 2007 - Studies in History and Philosophy of Science Part A 38 (1):1-35.
Hume's Experimental Method.Tamás Demeter - 2012 - British Journal for the History of Philosophy 20 (3):577-599.
The History of Psychological Categories.Roger Smith - 2005 - Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 36 (1):55-94.

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