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In this article it is argued that Popper's well-known deductive and falsificationistic epistemology is historically rooted in German psychology, notably the work of Otto Selz. Drawing on Popper's early and still unpublished psychological manuscripts it is shown how Otto Selz's psychology of thinking with its emphasis on the guiding role of schematic anticipations gave the impetus to Popper's theory of problem solving, his theory of the Searchlight, and its attendant rejection of empiricism, the so-called Bucket theory of knowledge. In the second part of the article it is argued that Selz's theory of schematic anticipations is rooted in Meinong's  Gegenstandstheorie . Because Meinong's theory was partly an attempt to do justice to the objectivity of thinking, this may explain why the anti-psychologist Popper felt nevertheless attracted to the psychology of Selz.

Popper, Otto Selz and Meinong's Gegenstandstheorie