I wonder if this has to do with how our brain associates the importance of us reading something on the smartphone vs. reading something on paper. We spend much

I wonder if this has to do with how our brain associates the importance of us reading something on the smartphone vs. reading something on paper. We spend much of our developing years reading from paper and taking tests, which may be telling our brains that things we've read on paper are likely to be of importance and worth remembering. Whereas smartphone use is mostly to browse / pass time so how brain takes things we've read via smartphone to not be as important. Perhaps the study would show different results if there was a generation of children whose school textbooks were primarily digital and had little social media use.