▁the ▁cogn itive ▁and ▁motor ▁systems ▁The ▁broken ▁es cal ator ▁phenomen on ▁is ▁the ▁result ▁of ▁the ▁dis soci ation ▁between ▁the ▁declar ative ▁and ▁proced ural ▁functions ▁of ▁the ▁central ▁nerv ous ▁system . ▁The ▁central ▁nerv ous ▁system ▁enables ▁us ▁to ▁adapt ▁to ▁the ▁movement ▁of ▁the ▁es cal ator , ▁however ▁this ▁locomot or ▁adaptation ▁is ▁in app ropri ately ▁expressed ▁when ▁walking ▁onto ▁a ▁broken ▁es cal ator . ▁A ware ▁that ▁the ▁es cal ator ▁will ▁not ▁move , ▁we ▁still ▁modify ▁our ▁g ait ▁and ▁post ure ▁as ▁if ▁to ▁adapt ▁to ▁movement . ▁This ▁shows ▁a ▁separation ▁between ▁our ▁declar ative ▁( or ▁cogn itive ) ▁system ▁and ▁our ▁proced ural ▁( or ▁motor ) ▁system ▁– ▁between ▁what ▁we ▁know ▁and ▁what ▁we ▁do . ▁ ▁In ▁the ▁brain , ▁declar ative ▁memory ▁processes ▁mem ories ▁we ▁are ▁cons ci ously ▁aware ▁of , ▁whereas ▁proced ural ▁memory ▁processes ▁our ▁movements . ▁The ▁fact ▁that ▁we ▁walk ▁in app ropri ately ▁fast ▁onto ▁an ▁es cal ator ▁we ▁know ▁to ▁be ▁broken ▁is ▁evidence ▁of ▁motor ▁adaptation ▁without ▁declar ative ▁memory . ▁The ▁motor ▁system ▁oper ates ▁without ▁cogn itive ▁control , ▁leading ▁to ▁the ▁un cons cious ▁generation ▁of ▁the ▁after - effect . ▁Sub ject s ▁in ▁an ▁additional ▁experiment ▁were ▁indeed ▁unable ▁to ▁suppress ▁the ▁after - effect ▁even ▁when ▁cons ci ously ▁and ▁volunt arily ▁attempting ▁to ▁do ▁so . ▁ ▁Pre - empt ive ▁post ural ▁response ▁Bron stein