Thanks to e-mail, Twitter and the blogosphere, I regularly exchange information with hundreds of people in a single day: scheduling meetings, sharing political gossip, trading edits on a book chapter, planning a family vacation, reading tech punditry. How many of those exchanges could happen were I limited exclusively to the technologies of the phone, the post office and the face-to-face meeting? I suspect that the number would be a small fraction of my current rate.
The question is not whether our brains are being changed. (Of course new experiences change your brain — that’s what experience is, on some basic level.) The question is whether the rewards of the change are worth the liabilities.