?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Lee%2C+JJ&rft.aulast=Lee&rft.aufirst=JJ&rft.volume=13&rft.issue=9&rft.date=28+September+2017&rft.title=PLOS+Computational+Biology&rft.atitle=Flexibility+to+contingency+changes+distinguishes+habitual+and+goal-directed+strategies+in+humans&rft.genre=article