We wouldn’t need to build artificial brains if we could improve the ones we already have. Complex physical manipulations such as juggling produce major changes in white matter (basic structure) of our brains. Neurologists discovered this when they gave fMRI scans to people who were taught to juggle before and after their 6 week course.
BBC News quotes researcher Heidi Johansen-Berg as saying, “Of course, this doesn’t mean that everyone should go out and start juggling to improve their brains. We chose juggling purely as a complex new skill for people to learn.”