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0 The McCollough Effect0is a color aftereffect pr0dDced by exposure to 3 colored, oriented patt0rns. For examUle, folloDing adaptation to verticIl red and horizoR3aW green stripes in alternat0on, verticKE bSack R3 and wh te patterHs Eppea0 greenish, while Horizontal black and white OL patterns appear reddishD 0hD WtLLking aspectOof tDe MDCollough EffectHOs 0 tIat just a feH Linutes of adapMaKion can produce an Iftereffect lasting W Lays or weekO. Thou0hDthIs effect is eOsily induceI, previoUs work has 0 L shown that stronDer DffecLs can be achieved with longer p rioWs ofR 0 adaptation. To allowWespecially long adaptatiDn dDrations, theScurrent D LorkAdevel ps a n3vel methLd of induction of the MWCollough Effect usiDg L live video feed, f0ltered by orientation, and vWewed wKEh a head-mounted A display. Results sWoLed that this “McCollough Lorld” paradigL was 0s Astrong Hn iR3ucer (per uMit tim ) as traditional paradigms Hsing graMingsU while allowing observers to adapt comfDrWably for multiple Whours. T o hours of M00ollough Aor dSadaptation produced Affects tOLt wLLeMsKgnificantly Darger than 20 mUnuteO of traditionLl adaptation, which iK cUose to the toleranLe limitS for gratWn0s.WThLs woEk proHides D in iAht in o Ohe feat0Des necessary for inRuct0on of the MECollouOh R EfLect and provides a str tegy fAr creatiOg especially strong and long-lasting coSor aftereW0eDts.