The Scientific American website has an article titled "Being John Malkovich: Personal Control of Individual Brain Cells." It begins:

In philosophy of mind, a "cerebroscope" is a fictitious device, a brain"“computer interface in today's language, which reads out the content of somebody's brain. An autocerebroscope is a device applied to one's own brain. You would be able to see your own brain in action, observing the fleeting bioelectric activity of all its nerve cells and thus of your own conscious mind. There is a strange loopiness about this idea. The mind observing its own brain gives rise to the very mind observing this brain. How will this weirdness affect the brain? Neuroscience has answered this question more quickly than many thought possible. (Source)

Dude. Whoa.

Thanks to Nevin!