Brain may have two minds of its own

Human brains are split into two hemispheres, which much research has shown can represent two states of mind. Due to some strange, unexplained quirk of evolution, scenes seen through the visual field of the right eye register as nerve impulses in the left half of the brain and vice versa. Goggles that limit vision to what the outer half of the right eye sees register images in the left hemisphere. Unexpectedly, such a view seems to alter the emotional views of some people. Harvard researcher Fredric Schiffer has shown that some patients with depression and post-traumatic stress syndrome see the world differently, depending on whether they look at it through the outer half of their left or right eye.