Well it’s just a theory. I wrote about this here:
https://www.mattsoreco.com/first-successful-30-day-challenge/
Adam Gazzaley articulates the theory here:
https://www.cnn.com/2012/09/23/opinion/gazzaley-mobile-brain/index.html
I definitely felt more focused during my 30 day challenge of no twitter, G+, etc. I have limited their use since. I need to be more mindful of other “clutter” that I default to when there is a split second of boredom. I truly believe in its negative downstream effect.