In this video, a person who had his corpus callosum severed. In other words, he has a split brain. This procedure is usually done to people who has suffered severe epileptic seizures. In this video, Joe, person who had his corpus callosum severed, is shown pictures and also words. When shown an image in his left visual field, he is unable to verbally name what it is. However, he can draw it with his left hand. The reason is because speech control is in the left hemisphere of the brain and image on the left visual field is received in the right hemisphere of the brain. Since the right hemispher controls the left hand, he is able to recognize and draw the object. There is no communication between the two hemispheres of the brain so Joe is limited in describing what he is being presented to him.