Generally speaking, jurors with above-average or high IQs are potentially more beneficial to defendants. This is not due to the inherent merit of one side’s case over the other; rather, it is reflective of the impact of cognitive deficiencies on decision-making skills. Also, low IQ jurors are more likely to rely on their emotions as opposed to trying to analyze a complicated or confusing fact pattern, thus arguments that generate strong negative emotions, such as fear or anger, are more likely to persuade them. Finally, low IQ jurors with a critical thinking skill deficit may depend more on first impressions to make decisions than their tenuous analytical skills, so they are less likely to carefully consider both sides and more likely to be persuaded by the first arguments they hear.
Do We Need Einsteins in the Jury Box? The Role and Impact of Juror IQ. (via)

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