This article was published by CNN on Nov 4, 2019.  A good article if you consider what is happening to the US labor force.  Below is an excerpt, and you can read the entire article here:  https://www.cnn.com/2019/11/04/health/screen-time-lower-brain-development-preschoolers-wellness/index.html

Higher screen use was associated with less well-developed white matter tracts (shown in blue in the image)  throughout the brain.

Screen time use by infants, toddlers and preschoolers has exploded over the last decade, concerning experts about the impact of television, tablets and smartphones on these critical years of rapid brain development.

Now a new study scanned the brains of children 3 to 5 years old and found those who used screens more than the recommended one hour a day without parental involvement had lower levels of development in the brain’s white matter — an area key to the development of language, literacy and cognitive skills.
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