Oguri M. ; J Neurosci Rural Pract [serial online] 2017 [cited 2017 Dec 6];8:691-2. DOI: 10.4103/jnrp.jnrp_248_17
The ataxia is slowly progressive and involves the lower extremities to a greater degree than the upper extremities. In general, results of electrophysiologic studies including visual, auditory brainstem, and somatosensory-evoked potentials are often abnormal.
Friedreich ataxia: Clinical feature and electrophysiological symptoms