span>balance <span  title="" class="an ">&ensp;</span>a <span  title="" class="an ">&ensp;</span>normal <span  title="" class="an ">&ensp;</span>auditory <span  title="" class="an ">&ensp;</span><span  title="BrainRegionP" class="an BrainRegionP">brainstem</span><span  title="" class="an ">&ensp;</span>response <span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>normal <span  title="" class="an ">&ensp;</span>transduction <span  title="" class="an ">&ensp;</span>currents <s