The left brain controls activities such as speaking, reading, memory, analysis and controlling the right side of the body. As such, damage to the left brain affects these processes, and may result in cognitive issues, difficulty speaking or writing, and difficulty with the right side of the body, states BrainandSpinalCord.org.
A stroke is one possible cause of injury to the left brain. Stroke survivors who experience left-brain injury sometimes experience paralysis on the right side of the body, difficulty communicating, personality changes and behavioral changes, according to the Cleveland Clinic. Behavioral changes following damage to the left hemisphere of the brain may include compulsiveness, cautiousness or disorganization. People who receive a traumatic brain injury affecting the left hemisphere of the brain tend to remain unconscious for a longer period of time, notes Wikipedia.
The two hemispheres of the brain work together in emotional processing, states Paul Fedio, Ph.D., of the National Institute of Neurological Disorders and Stroke. The right side of the brain scans one's surroundings, while the left side of the brain interprets and analyzes the information. When the left side of the brain is damaged, the right side of the brain attempts to compensate, becomes over stimulated, pessimistic, tense and anxious. Through his research, Fedio found that subjects who suffered injury to the left hemisphere of the brain interpreted positive sounds as being negative.