A common error that occurs with everyday thinking is Myside Bias — the tendency for people to evaluate evidence, generate evidence, and test hypotheses in a manner biased toward their own opinions. Part 1 looked at the correlation between myside bias and intelligence. Part 2 examines other factors that may contribute to myside bias.

In a series of experiments, Stanovich and West (2008) examined the association between cognitive ability and two key critical thinking skills: avoidance of myside bias and avoidance of oneside bias (when people prefer one-sided arguments over arguments presenting multiple perspectives). 

In Experiment 1, natural myside bias was investigated in 15 different propositions. In Experiment 2, myside bias and one-sided bias was studied. In Experiment 3, associations between thinking dispositions, in addition to cognitive ability, and one-sided and myside bias were investigated.

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