The study is one of the first to demonstrate the consequences of allowing children to have a TV or video game system in the bedroom.
Douglas Gentile, professor at the Iowa State University in the US, said that the research shows location really does matter.
In the study, when there was a TV or video games in the bedroom, children spent less time reading, sleeping or participating in other activities, which had a ripple effect on several outcomes.
Researchers were able to track these effects over a period of six months to two years.
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The study, published in the journal Developmental Psychology, also found children with bedroom media watched programs and played video games that were more violent, which increased levels of physical aggression.
Gentile said it stands to reason that most parents are not fully aware of what is happening behind closed doors.
"When most children turn on the TV alone in their bedroom, they are probably not watching educational shows or playing educational games," Gentile said.
Having bedroom media significantly changes the amount of time children spend with media, changes the content they view, but also changes what children do not do, such as reading.
Several studies have tracked changes in children's screen time. Gentile says that number continues to trend upward, nearing close to 60 hours a week that children spend in front of screens.
National studies show that more than 40 per cent of children, ages 4-6, have a TV in their bedroom, and a substantial majority of children 8 and older have a TV or video game console in their bedrooms.
It may be natural for parents to wonder why a TV in the bedroom is any different from any other room in the home, Gentile said.
There is no direct link between the physical presence of a TV and poor grades. However, bedroom media makes it easier for children to spend more time watching or playing, which displaces other beneficial and healthful activities.
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