Here’s an interesting story about a woman named Diane Van Deren.  She suffered from epilepsy, had a lobectomy, removal of the right temporal lobe.  What healed her in one way, then also pushed her to become an ultrarunner, but also had certain strange side affects.  All interesting discussion of the brain, exercise, and health.  Worth a read.

Brain Surgery Frees Runner, but Raises Barriers – NY Times