In the 1890s, the renowned psychologist George Stratton constructed special glasses that caused him to see the world upside down. The remarkable thing was that after a few days, Stratton’s brain adapted to his topsy-turvy worldview, and he no longer saw the world upside down. You might guess that when he took the inverting glasses off, he would start seeing things upside down again. He didn’t. But his vision had what he called, with Victorian charm, “a bewildering air.”

Through experimentation, I’ve found that the required readjustment period is, strangely, shorter when my brain has adapted to a dramatic distortion, say, reversing things from left to right or turning them upside down. When the distortion is subtle—a slightly offset viewpoint, for example—it takes less time to adapt but longer to recover.

http://spectrum.ieee.org/geek-life/profiles/steve-mann-my-augmediated-life