I took a break from IMing with a coworker and turned down my music for a minute to read this NYTimes piece about multitasking. I didn’t get through the whole thing because I got an email but I gather it’s about the downsides of trying to concentrate on several things at once.
The point is well taken when any one task, such as driving, requires quick reaction time. Our brains can only afford enough resources to concentrate on one thing at a time. On the other hand, that email can wait a minute while I surf the web. And newer communications methods like IM tolerate asynchrony better.
Both the technology and the social protocol expect up-to-the-minute, but not up-to-the-second, updates. When using these new technologies, we do sacrifice real-time responsiveness, but in return we get multiple collaborative modalities of near-real-time communication.