AdvertisementOnline Marketers Take Note Of Brains Wired For RewardsPlay05:39Download AudioJuly 24, 2013Steve HennfacebookEmailPopular online games like FarmVille use powerful reward systems to get players to spend real-world money on virtual items. (Zynga/AP)
Popular online games like FarmVille use powerful reward systems to get players to spend real-world money on virtual items. (Zynga/AP)