"On 42 Friday afternoons, after school, Christiaen taught chess to 20 boys randomly selected from a group of 40. The other 20 were the control group, the one that would be compared. He did his best to keep these students ignorant of their experimental function.Of course the article comes from a chess site and the study was done in the 70's. :)
In testing after these two years, the chess group scored somewhat better than the control group on several of Piaget’s tests for cognitive development. More of a difference, however, was evident in their regular school testing! In the school testing, the chess group did significantly better in both the fifth grade tests and (somewhat less so) in the sixth grade tests."
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