Excessive avoidance bias towards uncertain faces in non-clinical social anxiety individuals.

Previous survey studies have consistently shown a strong link between social anxiety and intolerance for uncertainty. However, this association lacks empirical validation from laboratory investigations. To bridge this gap, we conducted a study utilizing the ultimatum game task to assign distinct social connotations (egoistic, altruistic, and uncertain) to three initially neutral faces. Subsequently, we utilized the Approach-Avoidance Task (AAT) paradigm to evaluate participants' approach-avoidance tendencies towards the faces with varying social meanings. Additionally, we collected data on participants' levels of social anxiety and trait anxiety. Our results indicate that both social anxiety and trait anxiety levels impact individuals' avoidance behaviors when faced with socially uncertain cues. This suggests that individuals with higher levels of social anxiety may demonstrate increased sensitivity to uncertainty in social contexts, leading to avoidance behaviors. Crucially, our findings directly underscore the heightened avoidance tendencies of non-clinical individuals with social anxiety towards socially uncertain stimuli, thereby providing new empirical support for research on anxiety disorders related to uncertainty.