In London, in a used bookstore, he came across Gustav Fechner's book Elemente der Psychophysik (Elements of Psychophysics), which spurred him to conduct his famous memory experiments.
In London, in einem Antiquariat, stieß er auf Gustav Fechners Buch Elemente der Psychophysik, was ihn dazu bewog, seine berühmten „Gedächtnis-Experimente“ durchzuführen.