Dyspraxia occurs when the brain is not able to adequately plan actions. In adults, this can be acquired as a result of a stroke (CVA) or disease or brain lesion of some kind. The severity can range from mild to severe, and so the symptoms will vary accordingly.
Children on the spectrum, like any other children, can have a whole range of cognitive abilities. Many children diagnosed with ASD are very bright, or gifted. They may have an exceptional vocabulary and speak in sentences that sound mature for their age. They may have particular talents that match their interests and they can perform at an above-age level in an area.