Abstract
Previous studies on facial impression inference have focused on the physical features of faces, with only a few considering the effects of the observer. This study explored how participants' personality traits directly and indirectly affect the impression inference of human faces. Specifically, we examined how observers' personality traits impact their eye movements, which in turn influence impression inferences. Experiment 1 found relationships between participants' personality traits and eye movements, but these did not significantly impact impression inferences. In Experiment 2, we manipulated observers' observational behavior to control for the potential interactive effect between facial features and participants' eye movements during impression inference. This manipulation suggested that focusing on different areas of faces leads to different impression inferences. It also suggests that the same person might have different impressions of the exact same face by changing their observational behavior. These results deepen our understanding of the impact of facial features and participants' personality traits on impression inferences, indicating that observers' personality traits and observational behavior play a significant role in impression formation.