The effect of evidence order on jurors' verdicts: Primacy and recency effects with strongly and weakly probative evidence

Abstract In a series of studies, the effect of evidence order with strongly and weakly probative evidence was examined. In studies 1a, 1b, and 2, participants read a homicide trial containing four pieces of evidence (two strongly probative, two weakly) presented in differing orders and reported their verdicts. In Study 1a and 1b, fingerprint evidence and a video confession were strongly probative, while DNA evidence and eyewitness testimony were not. In Study 2, DNA and video confession evidence were strongly probative, but fingerprint evidence and eyewitness testimony were not. Across studies, results indicated recency effects when the last piece of evidence was strongly probative, with more guilty verdicts compared to when the last piece of evidence was weakly probative. Study 3 utilized a different trial scenario and six pieces of evidence to further test for a primacy effect. Results again indicated support for a recency effect, with no primacy effects found.