Disclosed are methods of improving impaired proprioception, treating brachial plexus injuries, regenerating large and small nerve fibers, treating dorsal root nerve injuries, and improving sensory neural responses in a subject by administration of a neublastin polypeptide.本發明揭示藉由投與紐布拉斯丁(neublastin)多肽以改善受檢者之本體感覺障礙、治療臂叢損傷、再生大及小神經纖維、治療背根神經損傷及改善感覺神經反應之方法。