Dadka sidata saddex nooc oo hidde-sideyaal ah oo laga dhaxlay Neanderthals waxay aad ugu nugul yihiin noocyada xanuunka qaarkood, sida lagu sheegay daraasad cusub (Communications Biology). Natiijooyinkii ugu dambeeyay waxay muujinayaan sida is-dhexgalka hore ee Neanderthals ay u saameysay hidde-sideyaasha aadanaha casriga ah. Cilmi-baadhayaashu waxay ogaadeen in dadka sita saddex nooc oo loo yaqaan 'Neanderthal variants' ee hidda-wadaha SCN9A, oo ku lug leh neerfayaasha dareemayaasha, ay aad ugu nugul yihiin xanuunka maqaarka ka dib markii ay hore u soo gaadheen saliidda khardal.