By jove, we've got it: EEG correlates of insightful problem solving

The history of our development over the last three millennia chronicles many remarkable and fundamental discoveries, such as Archimedes’ law of buoyancy, Newton’s law of gravity, Poincaré’s conjecture, which are considered as classical cases of cognitive insight (also popularly known as a Eureka moment), a phenomenon where the problem solver working on a complex problem suddenly makes a breakthrough after a period of frustration and finally experiences the much reported Aha!. But despite the widespread evidence and importance of cognitive insight, very little is known about its constituent cognitive components and their underlying neural mechanism.