wondering about consequences of screen vs text reading

Dear Mr Bloom, a top thinker in the field whispers to me in a recent whispernet email:

"I'm very skeptical about all neural imaging results, for the same reason that you are wondering about consequences of screen vs text reading. The study you sent me doesn't concern just reading, as I understand it, but the act of Web searching, too. So one question is whether the activities were really comparable, for example, the equivalent to Web surfing is not just reading something in a book but finding another book as though there were a hyperlink. There's also browsing in an open-stack library. This would be the real equivalent of Web surfing. Unfortunately there aren't many places that are really suitable for it, like the main reading room of the NY Public Library, which has not just reference books but an assortment of the best specialized books in hundreds of topics, like the best English-language histories of Denmark, Hungary, etc.

One problem of science and human behavior in general is that by the time we really understand something, the physical and human environments have usually changed so much that our knowledge is more historical than contemporary."