Incidental affect influences choice preference among competing alternatives in a modified Affect Misattribution Procedure.

Affective feelings exert a powerful influence on decision making, even when the source of those feelings is incidental, i.e., unrelated to the decision at hand. Research on the role of affect in decision making has typically focused on how incidental affect shapes evaluations of an individual target, and thus decisions about how to engage with that target. It is less clear, however, if and how individuals use their incidental affective feelings when evaluating and comparing multiple competing targets and deciding which one to choose. To investigate this, we modified the Affect Misattribution Procedure (AMP) to include two competing targets, presented sequentially, that individuals needed to choose between. In two pre-registered studies (N = 196 and N = 214), participants were presented with pairs of landscape images (e.g., beaches, lakes) and asked to choose which image in the pair they liked more. Each landscape was preceded by an affective prime: a briefly flashed image of a face that was either smiling (a positive prime), scowling (a negative prime), or neutral (a neutral prime). We found that participants were significantly more likely to choose landscapes preceded by primes of more positive valence, and this effect was driven by trials on which the positive prime came second. Our studies demonstrate that decision makers use their incidental affective feelings when making choices among competing alternatives, and introduce a novel methodology for understanding the constructive role of affect in preference formation.