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But even though the details shouldn’t have mattered, they did. Jurors who heard the favorable arguments with vivid details judged Mrs. Johnson to be a more suitable parent (5.8 out of 10) than did jurors who heard the unfavorable arguments with vivid details (4.3 out of 10). The details had a big impact.

We can take comfort, perhaps, in the fact that the swing wasn’t more dramatic. (If the mother’s fitness had dropped from eight to two, we might have had to worry a bit about our justice system.) But the jurors did make different judgments based on irrelevant vivid details. So why did the details make a difference? They boosted the credibility of the argument. If I can mentally see the Darth Vader toothbrush, it’s easier for me to picture the boy diligently brushing his teeth in the bathroom, which in turn reinforces the notion that Mrs. Johnson is a good mother.