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Boys who received a game system at the beginning of the study showed an immediate increase in how much time they spent playing video games and a decrease in the after-school academic activities.  They also had significantly lower reading and writing scores than the group of boys that were promised a game system at the end of the study.  Parents reported no behavioral changes, but there was an immediate increase in teacher-reported learning problems for boys that received a game system at the beginning of the study (Science Daily).