Submission 169
Less Is More - Dilution Effects in Evaluative Conditioning with Multiple Unconditioned Stimuli
SymposiumTalk-03
Presented by: Florian Weber
Research on Evaluative Conditioning (EC), that is, changing attitudes towards a Conditioned Stimulus (CS) by pairing it with a positive or negative Unconditioned Stimulus (US), has recently begun investigating stimulus-rich contexts with multiple USs appearing simultaneously. Evidence suggests that in these situations, conditioned attitudes follow the average valence of the simultaneously paired USs. One crucial yet unexplored consequence of this averaging pattern is the occurrence of a dilution effect: adding less positive (negative) USs to a situation with a highly positive (negative) US should diminish attitudes towards the paired CS, despite the less positive (negative) USs on their own being able to influence CS attitudes. To investigate this consequence, we conducted three experiments (N = 1100) in which CSs appeared with different combinations of USs with varying positive (negative) valence levels. Overall, the results confirm the averaging pattern observed in previous studies, which indeed led to a dilution effect in our EC paradigm: CSs simultaneously paired with a highly positive (negative) US and less positive (negative) USs were rated less positive (negative) compared to CSs that exclusively appeared with a highly positive US. The results suggest that when changing attitudes via EC in stimulus-rich contexts, US valence is more important than US quantity.