Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: His Productive Thinking was published posthumously in 1945. Earlier, he had earned his doctorate by inventing a lie detector for the objective study of testimony. His greatest discovery came due to the perceptions he experienced on a train trip in 1910, which led him to experiment with a stroboscope. The central tenet of his belief was Pragnanz, or "precision," in organization, a concept he formulated after his enunciation of the phi phenomenon. FTP, name this man who, with Koffka and Kohler, founded Gestalt psychology.
A:
Social Science