Psychologism is a family of philosophical positions, according to which certain psychological facts, laws, or entities play a central role in grounding or explaining certain non-psychological facts, laws, or entities.
The word was coined by Johann Eduard Erdmann as Psychologismus, being translated into English as psychologism.
the explanation or derivation of mathematical or logical laws in terms of psychological facts.
[5] 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.
[6] So were many nineteenth-century German philosophers such as Christoph von Sigwart, Benno Erdmann, Theodor Lipps, Gerardus Heymans, Wilhelm Jerusalem, and Theodor Elsenhans,[7] as well as a number of psychologists, past and present (e.g., Wilhelm Wundt[7] and Gustave Le Bon).