Imagine looking down through the top of your head onto the cortex of your brain. You would see that is made up of two halves called hemispheres: one on the left (the left brain) and one on the right (the right brain). This is the upstairs part of your brain!

The left and right brains are connected by an intricate network of nerve fibres called the corpus callosum. 

It was the ancient Egyptians who first noticed that the left brain tends to control the right side of the body and the right brain tends to control the left side of the body. Although each hemisphere is almost identical in terms of structure, each hemisphere operates in an entirely different way and are associated with very different activities. This is known as specialization or lateralization.