ABSTRACT
Among the people who left their mark on cognitive psychology, Karl Duncker's intellectual legacy is certainly outstanding. During the Weimar period, the Berlin Institute was certainly the most influential psychology institution in Germany. For instance, Carl Stumpf in Berlin, as well as Wundt in Leipzig, hoped to find answers to questions of epistemology by using experimental psychological methods. In 1922 Wolfgang Kohler was appointed to follow Stumpf's footsteps as director of the Institute. L. Sprung and H. Sprung summarize few main principles that guided the thinking of the Berlin school of Gestalt psychology. In terms of methodology, the Gestalt psychologist prioritized experimental methods. Kohler had been invited by Carl Murchison to visit Clark University for a year, and when offered a fellowship for one of his graduate students, he selected Karl Duncker. Problem solving, or "productive thinking," as Duncker, and before him, Max Wertheimer called it, is often discussed in the context of creativity.
