Essential Joseph Chilton Pearce 58
Researchers looking at children who spend a great deal of time with computer games found using brain imaging that these activities bypassed the prefrontal lobes and the neocortex. The activity is essentially sensory motor. The regions controlling the fingers and thumbs got a lot of activity. Most of the brain however, was silent. The prefrontal regions control all the other brain centers. The implications are profound. Dexterity in the thumbs was drawing developmental resources from the entire higher more evolved and complex brain centers. No activity, no development in these regions. Later when more complex responses are needed there is no biological founding for these functions to express, clearly a de evolutionary pattern.