Under the Gestalt theory of learning (Theory of Insight), when Sultan the chimpanzee in Kohler's experiment joins two short sticks to make a long stick and retrieves the banana, which psychological mechanism operates most prominently behind the sudden emergence of 'Insight' in this entire cognitive process?

According to Gestalt psychologists (such as Max Wertheimer, Kurt Koffka, and Wolfgang Kohler), learning is not merely the result of trial and error like Thorndike's theory, but is based on the ability to view a problem as a whole and suddenly understand its internal relationships. In Kohler's experiment, the chimpanzee Sultan analyzed the scattered circumstances across the entire field and used his 'insight' to connect the two sticks and solve the problem. This process is defined as 'Cognitive Restructuring' under Wikipedia reference.