Split-Brain Functioning

Before discussing split-brain functioning in detail, knowledge of some very basic brain anatomy is necessary. The brain is that part of the central nervous system which is encased within the skull. The brain is an incredibly complex organ made up of billions of cells that work together to support life. Although the brain is usually thought of as a single structure, it is actually divided into two halves which are called cerebral hemispheres. The two hemispheres, separated by a large fissure, are connected by several groups of nerve fibers that transfer information between the hemispheres. The most prominent connecting nerve mass is the corpus callosum. Control of basic physical movements and sensory functions is divided equally between the two hemispheres. Control of these functions by the brain is almost completely crossed, in that the right hemisphere controls the left side of the body, and the left hemisphere controls the right side of the body. For example the right foot, hand, and leg are controlled by the left hemisphere.