My gut feel is that this effect on comprehension, and increased prefrontal cortex activation, both happen because phones have so many distractions. The whole t

My gut feel is that this effect on comprehension, and increased prefrontal cortex activation, both happen because phones have so many distractions. The whole time I'm reading something on a phone my brain is constantly pinging me about all the other things that I do on my phone: emails/WhatsApp/Google word I don't know. So our conscious control centres in the PFC are always firing to mediate these little temptations. There are less of these temptations on a e-reader.