David Weinberger said last century that multi-tasking's bad for you because Heidegger said so.

[T]his is because attention isn't a dry and abstract or cognitive relation to the world. It's a relationship of caring. (Gosh, did Heidegger think of this before me? Damn! Wait, maybe I if I give it a made-up name I'll be able to trademark and claim it as my own thought. I've got it! Let's call it "e-care"?!)

If this is true -- and you can take it from my sincere look and deep tone of voice that it is -- then it proves that humans can't multitask, at least not always. If attention were nothing but cognition, if it were like a flashlight sweeping over a dark world, then maybe we could multitask by wagging our attention back and forth. But if paying attention to two objects also means switching our emotions, feelings, preferences, mood and valuations, then, well, our souls just aren't enough[.]

Hat tip snowdeal.org.  ¶ 8:52 AM