http://www.dailymail.co.uk/sciencetech/article-2061983/Teenage-video-game-players-brains-like-gambling-addicts.html?ITO=1490
vs.
From the Wikipedia article on Flow (http://en.wikipedia.org/wiki/Flow_(psychology):
Flow is the mental state of operation in which a person in an activity is fully immersed in a feeling of energized focus, full involvement, and success in the process of the activity. Proposed by Mihály Csíkszentmihályi, the positive psychology concept has been widely referenced across a variety of fields.[1]
According to Csíkszentmihályi, flow is completely focused motivation. It is a single-minded immersion and represents perhaps the ultimate in harnessing the emotions in the service of performing and learning. In flow, the emotions are not just contained and channeled, but positive, energized, and aligned with the task at hand. To be caught in the ennui of depression or the agitation of anxiety is to be barred from flow. The hallmark of flow is a feeling of spontaneous joy, even rapture, while performing a task[2] although flow is also described (below) as a deep focus on nothing but the activity – not even oneself or one's emotions.
Colloquial terms for this or similar mental states include: to be on the ball, in the moment, present, in the zone, wired in, in the groove, or keeping your head in the game.
Gaming
Flow is one of the fundamental reasons that people play video games.[23] This is especially true since the primary goal of games is to create entertainment through intrinsic motivation. The use of flow in games helps foster an enjoyable experience which increases motivation and draws players to continue playing. Game designers, in particular, benefit from integration of flow principles into game design.[24] Games facilitate flow as either an individual or group activity.
Flow in games has been linked to the Laws of Learning as part of the explanation for why learning games (the use of games to introduce material, improve understanding, or increase retention) can show such incredible results.[23] In particular, flow is intrinsically motivating, which is part of the Law of Readiness. The condition of feedback, required for flow, is associated with the feedback aspects of the Law of Exercise. The positive emotions associated with flow are associated with the Law of Effect. The intense experiences of being in a state of flow are directly associated with the Law of Intensity.