an earlier age than current recommendations suggest,
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.
Dimitri Christakis,
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, a pediatrician at Seattle Children’s Research Institute, advocated as much in an opinion piece in JAMA Pediatrics last May. But,
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, linking screen time to what’s going on in the brain and to behavior is hard. His lab recently found that 15- to 18-month-old toddlers playing with blocks had higher levels of cortisol,
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, a hormone that regulates stress levels, compared with those watching DVDs. That would suggest that a little stress, measured by cortisol in this experiment,
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, may be associated with activities that toddlers can learn from. Christakis thinks that, when it comes to cortisol levels,
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, tinkering with apps on a tablet may be more like playing with blocks than watching a screen. But researchers don’t really know what healthy levels of cortisol are in infants. In general, it’s also hard to link cortisol levels to long-term brain or behavior effects.
Tablets and smartphones can also facilitate interactions with parents, family and friends. A 2013 study in Child Development found that video chatting through a smartphone app can be just as effective as chatting in person when it comes to helping 24- to 30-month-old children bond and learn new words,
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.
Last year,
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, Laura Sanders wrote about her involvement in a project at Georgetown University that’s looking further into how children interact with video calls. Radesky is keen to investigate what kids can learn from apps versus the real world and whether apps might be more beneficial for some children versus others —

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