Studying the mind of a child gives a lot of insight on the child's development. There are a lot of books which gives the complete information about the studies made to check the impact of various day to day activities on the child's mind.
Following site can help you in getting information about the development of the mind of a child and the related books.
http://www.ag.ndsu.edu/pubs/yf/famsci/fs609w.htm
This site has also mentioned about the study on the immediate impact of fast-paced television on preschoolers' executive function, like attention, working memory, problem solving and delay of gratification. It finds that watching television not only has negative effect on executive function of kids over the long term, but also exercises immediate impact. Hopefully this site would help you.