Biased search, interpretation and / or recall have been invoked to explain attitude polarization ( when a disagreement becomes more extreme even though the different parties are exposed to the same evidence ), belief perseverance ( when beliefs persist after the evidence for them is shown to be false ), the irrational primacy effect [ JUST SAY IRRATIONAL PRIMACY INSTEAD OF THE IRRATIONAL PRIMACY EFFECT TO CONFORM WITH OTHER ITEMS ON THIS LIST ] ( a stronger weighting for data encountered early in an arbitrary series ) and illusory correlation [ USE PARENTHETICAL HERE AS IN THE PRECEDING ITEMS ON THE LIST ] in which people falsely perceive an association between two events.