According to David E. Meyer, professor of psychology at the University of Michigan, who was not involved in the research, "It's remarkable how similar the results were across the two experiments, using different methods, and these results nicely demonstrate that different types of mental preparation are conducive to different types of problem solving."
Mental preparation that led to insight solutions was generally characterized by increased brain activity in temporal lobe areas associated with conceptual processing, and with frontal lobe areas associated with cognitive control or "top-down" processing. Jung-Beeman noted that "Problem solvers could use cognitive control to switch their train of thought when stuck on a problem, or possibly to suppress irrelevant thoughts, such as those related to the previous problem." In contrast, preparation that led to more methodical solutions involved increased neural activity in the visual cortex at the back of the brain -- suggesting that preparation for deliberate problem solving simply involved external focus of attention on the video monitor on which the problem would be displayed.
More than a century ago, the great scientist Louis Pasteur said "Chance favors only the prepared mind." By this, he meant that sudden flashes of insight don't just happen, but are the product of preparation. According to Kounios, "We have begun to understand how the brain prepares for creative insight. This will hopefully lead to techniques for facilitating it."