POSTED BY: Morgen Peck // Do, Februar 18, 2010
It’s been clear since brain computer interfaces were developed, that customizing these devices would require learning both on the part of the machine and the human. New research in the Proceedings of the the Academy of the Sciences gives evidence that humans quickly adapt to BCIs.
A team of neurologists and computer scientists at the University of Washington recruited epilepsy patients awaiting surgery and recorded their brain activity with electrocorticography (electrodes attached to the surface of the brain) before and after they manipulated a simple BCI. You can find the full article here, to the right of the press release.
First of all, here’s what they did. They recorded during three circumstances: when patients imagined moving their hand, when they actually moved it, and when they moved a computer cursor by manipulating a BCI. The activity during the imagined task mapped roughly onto the recordings from the actual movement, but were less powerful. When the patients hooked up to the BCI, the pattern was again similar, but the signal much stronger than both the other recordings.
The press release pitched this as evidence that BCIs are a „workout“ for the brain. I don’t completely buy this. The brain isn’t a muscle and more activity doesn’t necessarily mean it’s operating at a higher level. What it does indicate (to me), and what I find far more interesting, is that people can quickly change their brain activity to accommodate BCIs. It also shows how important visual feedback is to people who are manipulating these devices. Experiments like this seem like a good way to maximize the level of feedback a user is getting and to test out different ways of delivering it.