The corpus callosum separates the two hemispheres of the brain, left and right. It is a short pencil-shaped bundle of nerve fibers that provides the major connecting link between the two brains. An interesting phenomenon is seen if the corpus callosum is severed. There seems to be very little, if any, communication between the left and right brains. For example, the speech centers of the brain are located in the left hemisphere. If a person who has had the corpus callosum severed is presented with the view of an object that can only be seen by his left eye, the signal is transmitted to the right side of his brain. When asked whether he sees this object, the person will reply that he cannot (remember, the speech centers are on the left side of the brain). And yet, this person will have some conscious awareness of the object and will often perform tasks successfully indicating that he is aware of the object.