Hemiplegia occurs when the function of motor areas in the brain become impaired, predominantly unilaterally, during perinatal development. Children with hemiplegia show impairments in motor control of the affected side of the body. Impairments in use of the upper extremity are common, and lead to functional disability throughout the lifespan of a person with hemiplegia. Upper extremity impairments can severely affect a person's ability to carry out activities of daily living.