The concept of “right brain left brain” refers to the two hemispheres of your brain. Some amazing experiments involving people who’ve had the corpus callosum cut taught us most of what we know about the differences between the two sides. The surgery is performed on epileptics to reduce the incidence of seizures, and it isolates most of the right hemisphere from the left hemisphere.
For a typical experiment, a divider allows a participant to see two objects – say, a cup with the right eye and a lemon with the left. When asked what they see, they’ll say they see a cup, and nothing more, because most people process both language and information from the right eye with their left brain (left hemisphere). However, when they write down what they see, using their left hand, they’ll write “a lemon,” because both the left hand and eye are controlled by the right side of the brain.
Of course, you have only one brain, and the two hemispheres work together normally. These split-brain experiments show how distinct the two sides really are, though. When the corpus callosum is cut it’s as if there really are two brains. What...