The cerebrum is generally believed to be the area of the brain in which all conscious mental activities transpire. Divided into two hemispheres by a deep groove called the longitudinal cerebral fissure, each side of the cerebrum is active in different tasks. The left hemisphere of the cerebrum is associated with reasoning, language, logic, and numbering. The right side, however, is associated with creativity and is important in activities such as facial recognition, depth perception, and orientation. The reason for this asymmetrical functionality of the cerebrum has been widely debated among scientists and was once solely believed to be a human trait. However, evidence of less pronounced symmetries has since been found in other animals.