Neue Bahnen in der Lehre vom Verhalten der Niederen Organismen

Environmental forces in child behavior and development.

“…In biology the tropism theory of Loeb attempted to establish in a scientifically precise way dynamic relations between environmental stimulation and the behavior of certain animals. It has, however, been shown that the circumstance of the animals' "learning" implies essential modification (22), and moreover that their behavior depends upon their momentary "mood" (3).…”