Sometime later -- it could be 15 minutes; it could be 15 days -- the same stimuli are put before the subject, and the subject is asked to re-rank the stimuli.
いくらか時間が経った後――15分後もしくは15日後かもしれません―― 被験者の前に同じ絵を並べ 再度ランク付けをしてもらいます