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18 Recent studies reported that the attraction effect, whereby inferior decoys cause choice reversals, 19 fails to replicate if the choice options are presented in a pictorial rather than abstract numerical 20 form. We argue that the pictorial setting makes the similarity between decoy and target salient, 21 while the abstract one emphasizes the inferiority relationship between them, crucial for the effect 22 to occur. Thus, we used a novel experimental design in which both similarity and inferiority are 23 equally easy to judge, their relative strength simple to manipulate, and choices incentivized 24 rather than hypothetical. Using eye-tracking, we found that both the transfer of attention towards 25 an undesirable target and choice reversal likelihood increase when the decoy is more strongly 26 inferior but less similar to the target. This suggests that a key mechanism in the attraction effect 27 is that, by virtue of its inferiority, a decoy projects a spotlight of attention towards the target, 28 making it more attractive. 29

journal of neuroscience psychology and economics

Inferiority, not similarity of the decoy to target, is what drives the transfer of attention underlying the attraction effect: Evidence from an eye-tracking study with real choices.