▁of ▁the ▁sk ull , ▁the ▁for amen ▁mag num . ▁Thus , ▁when ▁an ▁increase ▁of ▁pressure ▁in ▁a ▁hem is phere ▁of ▁the ▁brain ▁exists , ▁the ▁c ere br al ▁ped un cle ▁on ▁the ▁opposite ▁hem is phere ▁is ▁pushed ▁up ▁against ▁the ▁tent or ium , ▁which ▁separ ates ▁the ▁posterior ▁f ossa ▁from ▁the ▁middle ▁f ossa . ▁This ▁produces ▁a ▁visible ▁" not ch " ▁in ▁the ▁c ere br al ▁ped un cle . ▁Because ▁of ▁the ▁fact ▁that ▁a ▁K ern oh an ' s ▁not ch ▁is ▁caused ▁by ▁an ▁injury ▁creating ▁pressure ▁on ▁the ▁opposite ▁hem is phere ▁of ▁the ▁brain , ▁it ▁is ▁character ized ▁as ▁a ▁false ▁local izing ▁sign . ▁ ▁The ▁K ern oh an ' s ▁not ch ▁phenomen on ▁is ▁unique ▁in ▁that ▁it ▁is ▁not ▁only ▁a ▁false ▁local izing ▁sign , ▁but ▁is ▁also ▁i ps il ater al ▁or ▁same - s ided . ▁The ▁left ▁c ere br al ▁ped un cle ▁contains ▁motor ▁fib ers ▁that ▁cross ▁over ▁to ▁the ▁right ▁side ▁of ▁the ▁body . ▁Thus , ▁if ▁you ▁have ▁a ▁right ▁hem is phere ▁trans - t ent orial ▁h erni ation , ▁it ▁causes ▁a ▁K ern oh an ' s ▁not ch ▁in ▁the ▁left ▁c ere br al ▁ped un cle ▁which ▁results ▁in ▁right - s ided ▁motor ▁imp air ment . ▁Therefore , ▁you ▁get , ▁par ado x ically , ▁imp air ment