The cross-sectional group was asked to complete the tests only once. The results, however, were not as conclusive as they had hoped, and the biggest improvement was the participants' ability to play their respective games. A more interesting finding was that the expert players had an advantage in almost all cognitive tests compared to the other participants. This led the study team to hypothesize that “it is entirely possible that many more hours of experience are needed to see these benefits.” In this example, a large study was conducted on a variety of individuals with little to show for it, however, the next example paints a very different picture