Past research has shown that people who use caudate nucleus-dependent navigation strategies have decreased grey matter and lower functional brain activity in the hippocampus. Video gamers now spend a collective three billion hours per week in front of their screens. In fact, it is estimated that the average young person will have spent some 10,000 hours gaming by the time they are 21. The effects of intense video gaming on the brain are only beginning to be understood. The study was conducted among a group of adult gamers who were spending at least six hours per week on this activity. For more than a decade now, research has demonstrated that action video game players display more efficient visual attention abilities.
However, this study found that gamers rely on the caudate-nucleus to a greater degree than non-gamers. Past research has shown that people who rely on caudate nucleus-dependent strategies have lower grey matter and functional brain activity in the hippocampus. This means that people who spend a lot of time playing video games may have reduced hippocampus integrity, which is associated with an increased risk of neurological disorders such as Alzheimer's disease. Because past research has shown video games as having positive effects on attention, it is important for future research to confirm that gaming does not have a negative effect on the hippocampus. Future research will investigate the direct effects of specific video games on the integrity of the reward system and hippocampus.