The comprehensive review published in the journal Psychological Science.
"The findings from the original study, upon further scrutiny, are not borne out. We found that there is still no evidence that TV, by itself, causes ADHD or any kind of attention problems in young children," said Wallace E. Dixon, Jr., a professor of psychology and department head at East Tennessee State University and co-author of the study.
"Our research also tells us that is important to be sceptical of earth-shattering findings that come in the form of 'something that everybody is doing harms our children.' Extraordinary claims require extraordinary evidence," he added.
Dixon added that what excites his team about the research is that "we can ease up on blaming parents or making them feel guilty for letting their children watch television when they are very young".
The newly reported research involved looking at the same data as the 2004 study and using multiverse analyses--a technique that involves asking a research question hundreds of different ways to determine if the answers are similar each time.
This method was used to create 848 analyses to find out if early TV viewing causes later attention problems. A vast majority of results showed no link between the two. The few that did, the authors believe, reflect some oddities in the data set that are not likely to represent the real world.