This research is being done to find out if Baclofen, a medicine that is often used for the
treatment of abnormal stiffness, might also be useful to treat some of the neurologic
problems caused by ataxia telangiectasia (A-T). The investigators also want to find out if
there are better ways to measure the problems of ataxia and abnormal eye movement for future
studies of medication in ataxia telangiectasia.