These include a wide variety of injuries and medical disorders that affect the central nervous system. They include epilepsy, stroke, Parkinsonian syndrome, cerebral palsy, spinal cord or nerve root injuries, multiple sclerosis, amyotrophic lateral sclerosis (Lou Gehrig's disease), myasthenia gravis, muscular dystrophy, peripheral neuropathies, chronic brain syndrome, cerebral trauma, syringomyelia, and various degenerative disorders including Huntington's chorea, Friedreich's ataxia, inclusion body myositis and innumerable others.  

The limitations produced by these impairments are quite varied.   Individuals with neurological disorders often have difficulty using one or more of their hands and feet for repetitive activities.   Some have difficulty seeing, communicating, swallowing or breathing. Others have impaired balance or can't operate various kinds of machinery.   Still others have impaired mentation and difficulty dealing with the mental demands of work.  

Most neurological disorders can be objectively documented by laboratory test results and by the presence of characteristic findings on examination. The absence of such results and findings makes it difficult to establish a claim of disability based on such disorders.  Where the requisite findings are present, the nature and degree of the limitations resulting from the disorder generally determine whether or not disability benefits will be granted.