Central diabetic neuropathy is a never concept and it can be detected by simple and noninvasive methods. One of these methods is brainstem auditory evoked potentials (BAEP) and interpretations of them (2,3). By this method, functional and autonomic pathologies from the acustic nerve to the upper part of the brainstem can be demonstrated at an early stage (3). Lesions on these levels result in changes in BAEP amplitudes and latencies. Evaluation of these changes might help to determine early subclinic injuries restricted to the afore mentioned regions (4).