▁behaviour ▁despite ▁knowledge ▁that ▁it ▁is ▁broken . ▁F ear - related ▁mechan isms ▁are ▁indeed ▁known ▁to ▁be ▁imper vious ▁to ▁cogn itive ▁control . ▁ ▁However , ▁another ▁experiment ▁demonstrated ▁that ▁the ▁after effect ▁was ▁not ▁as ▁inten se ▁when ▁subjects ▁walked ▁onto ▁the ▁station ary ▁s led ▁with ▁the ▁opposite ▁leg ▁of ▁the ▁one ▁they ' d ▁stepped ▁with ▁in ▁the ▁MO V ING ▁tri als . ▁If ▁the ▁after - effect ▁was ▁generated ▁by ▁a ▁fear ▁that ▁the ▁platform ▁would ▁move , ▁it ▁would ▁be ▁triggered ▁whenever ▁and ▁however ▁the ▁subject ▁stepped ▁onto ▁it . ▁This ▁therefore ▁suggests ▁that ▁the ▁after - effect ▁is ▁mainly ▁generated ▁by ▁proced ural ▁memory , ▁which ▁is ▁most ▁inten se ▁when ▁the ▁conditions ▁of ▁the ▁adaptation ▁phase ▁are ▁perfectly ▁rep licated . ▁ ▁' B rak ing ' ▁the ▁after - effect ▁The ▁after - effect ▁is ▁an ▁internally ▁generated ▁post ural ▁threat ▁which ▁must ▁be ▁de alt ▁with . ▁Without ▁a ▁' bra king ' ▁system ▁to ▁reduce ▁its ▁impact ▁on ▁our ▁balance , ▁we ▁would ▁fall ▁when ▁ste pping ▁onto ▁a ▁station ary ▁es cal ator . ▁ ▁External ▁thre ats ▁to ▁our ▁balance ▁are ▁de alt ▁with ▁by ▁the ▁vest ib ular ▁system . ▁However , ▁a ▁ 2 0 0 8 ▁experiment ▁showed ▁that ▁the ▁intensity ▁of ▁the ▁after - effect ▁in ▁subjects ▁lack ing ▁a ▁vest ib ular ▁function ▁( lab yr inth ine ▁defect ive ▁subjects ) ▁was ▁not ▁superior ▁to ▁normal ▁subjects , ▁suggesting ▁that ▁the