 The effect is strongest for desired outcomes, for emotionally charged issues, and for deeply entrenched beliefs.Confirmation bias is a broad construct covering a number of explanations.Biased search, interpretation and memory 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 (a greater reliance on information encountered early in a series) and illusory correlation (when people falsely perceive an association between two events or situations).