TV and achievement study

Study shows how TV may be good for the brain
A look at standardized test scores from 1965 by two University of Chicago Graduate School of Business economists was able to compare the results of students based on the relative levels of television penetration in their regions. The research suggests that exposure to television in early childhood correlates with higher test scores, especially among children in homes where English was not the first language.
Matthew Gentzkow and Jesse Shapiro. (2008). Preschool Television Viewing and Adolescent Test Scores: Historical Evidence from the Coleman Study. Quarterly Journal of Economics, 123(1), 279-323.