Introduction: The paper investigates the impact of the use of metaphors in reasoning tasks concerning vaccination, especially for defeasible reasoning cases. We assumed that both metaphor and defeasible reasoning can be relevant to let people understand vaccination as an important collective health phenomenon, by anticipating possible defeating conditions. -/- Methods: We hypothesized that extended metaphor could improve both the argumentative and the communicative effects of the message. We designed an empirical study to test our main hypotheses: participants (N = 196, (...) 78% females; Meanage = 27.97 years, SDage = 10.40) were presented with a text about vaccination, described in either literal or metaphorical terms, based on uncertain vs. safe reasoning scenarios. -/- Results: The results of the study confirmed that defeasible reasoning is relevant for the communicative impact of a text and that an extended metaphor enhances the overall communicative effects of the message, in terms of understandability, persuasion, perceived safety, and feeling of control over the health situation, collective trust in expertise and uptake of experts' advice. However, the results show that this effect is significantly nuanced by the type of defeasible reasoning, especially in the case of participants' trust in expertise and commitment to experts' advice. -/- Conclusion: Both communicative and defeasible reasoning competences are needed to enhance trust in immunization, with possible different outcomes at an individual and collective level. (shrink)

This work examines the use and understanding of metaphor in wildfire discourse. We focus on the framing of wildfires as monsters, seen in statements such as “Monster wildfire rages in Colorado” and “Two monster wildfires in Northern California are slowly being tamed,” which reflect a “wildfire is monster” metaphor. Study 1 analyzes how and when this phrase is used in TV news reports of wildfires, and Study 2A and Study 2B investigate how it influences reasoning about risks associated with wildfire. (...) The results show that metaphor is widely used in framing news reports about significant wildfires, and that its use influences how people reason about them. The work is part of a project aimed at developing better ways to communicate about risks related to natural events and climate change. (shrink)

People regularly encounter metaphors in a variety of different communicative settings, but most studies of metaphor framing have relied exclusively on written materials. Across three experiments (N...