These games were chosen for the research. A study of electronic games and cognition conducted by Sharon Ramsey as a part of her research. The research paper is in the review stage and will be linked as soon as it is available. Here is a brief abstract from the research.
This study examined the impact of cognitive training on aspects of executive function, specifically attention, impulse control, working memory and problem solving strategies. Children aged five to nine, who were in kindergarten to third grade, were tested.