Clifford Nass knows about multi-tasking. Quite simply, his message is that we're no good at it. And, the more we try to multi-task the worse we get at each of the tasks we're attempting.

Nicholas Carr (The Shallows) is with him. While it seems that the popular interpretation of Miller's Magic Number 7 that we can store up to 7 things in working memory at once was not entirely what he meant in 1950's, Carr goes on to tell us that this number is actually more like 2, maximum 4. The idea of cognitive overload is that if we put more in than we can take, something else has to come out. Keep pouring into that glass and it overflows.

So, brutally summarising their work in one sentence Nass tells us we need to focus on one task at a time to be most successful, Carr that if we need more than a couple of things in our working memory that'll start to go wrong. We can't multi-task.

The good news is years of research into cognitive science are backing up my Pac-man strategy. Nass and Carr wouldn't be watching the ghosts at the same time as planning their route round the maze, with the television on in the background and their phone ringing. They would have a strategy in place, complete a section, pause to watch the movement of the ghosts and then carry on, focus on each particular skill as required.

Pac-man is a beautiful model for something that I'm certain I'll return to in later posts. As both men allude to in the clips above, the skill here is not trying to process many parallel streams at once, but in learning which to filter out, how to prioritise the many sources of information coming in.

If you're wondering what it is that Pac-man is teaching us as educators, and why I'm still writing about it after 2 weeks, that's it right there. Pac-man makes us better uni-taskers.

Image sources (and apologies to all concerned for what might be the worst piece of Photoshop I've ever done) - Wired, Atari Age.