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This information was taken from "Forms of Cerebral Palsy":
Ataxic CP is the least common form of cerebral palsy. Ataxia means having a lack of balance. People with ataxic CP have a disturbed sense of balance and depth perception. They usually have low muscle tone, a staggering walk and unsteady hands. Ataxia results from damage to the cerebellum, the brain's major center for balance and coordination. A child with ataxic cerebral palsy may have an uncoordinated and wide-based gait or difficulty standing in one place without moving. Ataxia continues to improve until the age of 8 to 10, at which time the balance and coordination system reaches maximum improvement. Because ataxia involves the hands, it makes fine motor control activities, such as writing, difficult. Ataxia CP affected people have a lot of shakiness, like a tremor you might have seen in a very old person, especially when they are trying to handle or hold a small object such as a pen.