▁be ▁recorded ▁before ▁the ▁conscious ▁intention ▁to ▁move . ▁To ▁determine ▁when ▁subjects ▁felt ▁the ▁intention ▁to ▁move , ▁he ▁asked ▁them ▁to ▁watch ▁the ▁second ▁hand ▁of ▁a ▁clock . ▁After ▁making ▁a ▁movement , ▁the ▁volunte er ▁reported ▁the ▁time ▁on ▁the ▁clock ▁when ▁they ▁first ▁felt ▁the ▁conscious ▁intention ▁to ▁move ; ▁this ▁became ▁known ▁as ▁Lib et ' s ▁W ▁time . ▁ ▁Lib et ▁found ▁that ▁the ▁un cons cious ▁brain ▁activity ▁of ▁the ▁read iness ▁potential ▁leading ▁up ▁to ▁subjects ' ▁movements ▁began ▁approximately ▁half ▁a ▁second ▁before ▁the ▁subject ▁was ▁aware ▁of ▁a ▁conscious ▁intention ▁to ▁move . ▁ ▁These ▁studies ▁of ▁the ▁timing ▁between ▁actions ▁and ▁the ▁conscious ▁decision ▁bear ▁upon ▁the ▁role ▁of ▁the ▁brain ▁in ▁understanding ▁free ▁will . ▁A ▁subject ' s ▁declaration ▁of ▁intention ▁to ▁move ▁a ▁finger ▁appears ▁after ▁the ▁brain ▁has ▁begun ▁to ▁implement ▁the ▁action , ▁suggesting ▁to ▁some ▁that ▁un cons ci ously ▁the ▁brain ▁has ▁made ▁the ▁decision ▁before ▁the ▁conscious ▁mental ▁act ▁to ▁do ▁so . ▁Some ▁believe ▁the ▁imp lication ▁is ▁that ▁free ▁will ▁was ▁not ▁involved ▁in ▁the ▁decision ▁and ▁is ▁an ▁ill usion . ▁The ▁first ▁of ▁these ▁experiments ▁reported ▁the ▁brain ▁registered ▁activity ▁related ▁to ▁the ▁move ▁about ▁ 0 . 2 ▁s ▁before ▁movement ▁on set . ▁However , ▁these ▁authors ▁also ▁found ▁that ▁aw aren ess ▁of ▁action ▁was ▁anticip atory ▁to ▁activity ▁in ▁the ▁mus cle ▁underlying ▁the ▁movement ; ▁the ▁entire ▁process ▁resulting ▁in ▁action ▁involves ▁more