="an ">&ensp;</span>key <span  title="" class="an ">&ensp;</span>signal <span  title="" class="an ">&ensp;</span>integrator <span  title="" class="an ">&ensp;</span>between <span  title="" class="an ">&ensp;</span>limbic <span  title="" class="an ">&ensp;</span><span  title="BrainRegionP" class="an BrainRegionP">forebrain</span><span  title="" class="an ">&ensp;</span>regions <span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>monoaminergic <span  title="" class="an ">&ensp