Wpływ negatywnego afektu na kształt funkcji wag decyzyjnych

Abstract

When making decisions, people tend tooverweight small probabilities and underweight moderate and high probabilities. This bias is stronger for affect-rich outcomes. In the current research, we investigated the influence of object-irrelevant affect on distortions of probabilities. Subjects participated in two independent tasks. In the first one, participants had tofollow sets of stimuli displayed serially on ascreen. Depending on the experimental condition, neutral envelopes were presented with aset of other neutral or negative stimuli. In the second task, subjects declared certainty equivalents for nine lotteries by giving the maximum amount of money that they would pay in order toinsure negatively or neutrally conditioned envelopes from previous task. We estimated the probability weighting function described by two parameters – attractiveness of the lottery outcome and probability discriminability – for both experimental conditions, separately. Participants showed alower mean value of attractiveness for negatively conditioned envelopes. However, the discriminability parameter did not differ between conditions. Additionally, we found that less numerate individuals use object-irrelevant affect tomake decisions under risk, which is expressed in more pronounced distortions in probability weighting.

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