One Extra Hour of TV Reduces Toddlers’ Kindergarten Chances

Each extra hour of TV damages toddlers’ vocab, math and class engagement 3 years later.

Each hour of TV above recommendations damages toddlers’ vocab, math and class engagement 3 years later.

A new study that followed almost 2,000 Canadian children from birth found that an extra hour’s TV viewing at 2.5-years-old predicted worse performance later when they attended kindergarten (Pagani et al., 2013).

The American Academy of Pediatrics recommends that children should watch no more than two hours of TV per day after two years of age, and none before that age.

The study backs up this recommendation, finding that the more children exceeded this recommendation at 2.5 years old, the worse their vocabulary, math and motor skills were at 5-years-old.

On average the children watched 1.5 hours of TV every day but increasing this by just one hour was enough to put a dent in their psychological scores three years later. Not only that, but they also had weaker attention and were more likely to be bullied by classmates.

The study’s lead author, Professor Linda Pagani of the University of Montreal explained:

“This is the first time ever that a stringently controlled associational birth cohort study has looked at and found a relationship between too much toddler screen time and kindergarten risks for poor motor skills and psychosocial difficulties, like victimization by classmates.”

Although this is the best study available linking TV watching with cognitive performance amongst toddlers, there have been hints of the dangers:

  • One study found that just 9 minutes of watching fast-paced cartoons had an immediate negative effect on 4-year-old’s executive function, such as their ability to delay gratification (Lillard & Peterson, 2011).
  • Another study found that watching noneducational programmes at age 3 was associated with attentional problems at age 4-5 (Zimmerman et al., 2007).

The first three years of life are a critical period in brain development, a fact of which some parents seem to be unaware. After 3-years of age, there’s evidence that the right kind of preschool TV can be beneficial. Before that, though, many scientists think TV is best avoided or severely limited.

Image credit: tOmsk

Author: Dr Jeremy Dean

Psychologist, Jeremy Dean, PhD is the founder and author of PsyBlog. He holds a doctorate in psychology from University College London and two other advanced degrees in psychology. He has been writing about scientific research on PsyBlog since 2004.

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