 Wundt used the "… nisi intellectu ipse" quotation 1862 on the title page of his "Beiträge zur Theorie der Sinneswahrnehmung" (Contributions on the Theory of Sensory Perception) and published a detailed and aspiring monograph on Leibniz Wundt shaped the term apperception, introduced by Leibniz, into an experimental psychologically based apperception psychology that included neuropsychological modelling – an excellent example of how a concept created by a great philosopher could stimulate a psychological research program.One principle in the thinking of Leibniz played a fundamental role