On the role of vocal emotions in social decision-making

Emotional expressions constitute valuable information for decision-making in social interaction contexts. However, the range of emotions that have been studied is limited. The present study addresses the effects of a wider range of emotional expressions using a methodology modeling interdependent decision-making in social contexts, the Assurance Dilemma. Joy, sadness, anger, fear, disgust and emotionally neutral vocal expressions were presented to 46 participants taking part in the Assurance Dilemma, obtaining behavioral and judgment data on cooperation behavior. For each emotion, predictions based on theoretical accounts and research on emotion induction in decision-making contexts were advanced; joy, sadness and fear were predicted to increase cooperation while anger and disgust to decrease it, as compared to neutral expressions. Results show that emotional expressions reliably affected cooperation, although not always according to the predictions: except for joy, all emotions decreased cooperation. Judgment measures provide further insight into the decision-making process. When collected before participants experienced feedback in the interactions, judgment measures show that participants hold a priori expectations on others' likely behaviors depending on the emotional expression they display and are willing to use them to guide their decision-making process. This data aligns more closely with predictions. However, after experiencing outcomes, expectations are revised and converge with the behavioral patterns observed in the actual interactions. Results are discussed in terms of how emotional expressions are used for guiding expectations and taking decisions in social interaction contexts and the role that experience plays in this process. Limitations are pointed out directions for future research suggested.