Psychologism

Psychologism is a philosophical position, according to which psychology plays a central role in grounding or explaining some other, non-psychological type of fact or law.

The Oxford English Dictionary defines psychologism as: "The view or doctrine that a theory of psychology or ideas forms the basis of an account of metaphysics, epistemology, or meaning; (sometimes) spec. the explanation or derivation of mathematical or logical laws in terms of psychological facts." Psychologism in epistemology, the idea that its problems "can be solved satisfactorily by the psychological study of the development of mental processes", was argued in John Locke's An Essay Concerning Human Understanding (1690).

Other forms of psychologism are logical psychologism and mathematical psychologism. Logical psychologism is a position in logic (or the philosophy of logic) according to which logical laws and mathematical laws are grounded in, derived from, explained or exhausted by psychological facts or laws. Psychologism in the philosophy of mathematics is the position that mathematical concepts and/or truths are grounded in, derived from or explained by psychological facts or laws.

The word was coined by Johann Eduard Erdmann as Psychologismus, being translated into English as psychologism.

John Stuart Mill was accused by Edmund Husserl of being an advocate of a type of logical psychologism, although this may not have been the case. So were many nineteenth-century German philosophers such as Christoph von Sigwart, Benno Erdmann, Theodor Lipps, Gerardus Heymans, Wilhelm Jerusalem, and Theodor Elsenhans (), as well as a number of psychologists, past and present (e.g., Wilhelm Wundt and Gustave Le Bon).

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