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Theodor Ziehen(1862-1950), is one part of the classical trio of sensualistic association psychologists (together with G.E. Müller and H. Ebbinghaus) and with his Leitfaden der Physiologischen Psychologie created a counter-concept to Wundt’s theory of the same name.
He was professor of psychology at Friedrich-Schiller-Universität, Jena, Germany.