BackgroundThe concept of vulnerability has held a central place in research ethics guidance since its introduction in the United States Belmont Report in 1979. It signals mindfulness for researchers and research ethics boards to the possibility that some participants may be at higher risk of harm or wrong. Despite its important intended purpose and widespread use, there is considerable disagreement in the scholarly literature about the meaning and delineation of vulnerability, stemming from a perceived lack of guidance within research ethics standards. The aim of this study was to assess the concept of vulnerability as it is employed in major national and international research ethics policies and guidelines.MethodsWe conducted an in-depth analysis of 11 (five national and six international) research ethics policies and guidelines, exploring their discussions of the definition, application, normative justification and implications of vulnerability.ResultsFew policies and guidelines explicitly defined vulnerability, instead relying on implicit assumptions and the delineation of vulnerable groups and sources of vulnerability. On the whole, we found considerable richness in the content on vulnerability across policies, but note that this relies heavily on the structure imposed on the data through our analysis.ConclusionsOur results underscore a need for policymakers to revisit the guidance on vulnerability in research ethics, and we propose that a process of stakeholder engagement would well-support this effort.
The concept of vulnerability is widely used in research ethics to signal attention to participants who require special protections in research. However, this concept is vague and under-theorized. There is also growing concern that the dominant categorical approach to vulnerability (as exemplified by research ethics regulations and guidelines delineating vulnerable groups) is ethically problematic because of its assumptions about groups of people and is, in fact, not very guiding. An agreed-upon strategy is to move from categorical towards analytical approaches (focused on analyzing types and sources of vulnerability) to vulnerability. Beyond this agreement, however, scholars have been advancing competing accounts of vulnerability without consensus about its appropriate operationalization in research ethics. Based on previous debates, we propose that a comprehensive account of vulnerability for research ethics must include four components: definition, normative justifications, application, and implications. Concluding that no existing accounts integrate these components in a functional (i.e., practically applicable) manner, we propose an integrative and functional account of vulnerability inspired by pragmatist theory and enriched by bioethics literature. Using an example of research on deep brain stimulation for treatment-resistant depression, we illustrate how the integrative-functional account can guide the analysis of vulnerability in research within a pragmatist, evidence-based approach to research ethics. While ultimately there are concerns to be addressed in existing research ethics guidelines on vulnerability, the integrative-functional account can serve as an analytic tool to help researchers, research ethics boards, and other relevant actors fill in the gaps in the current landscape of research ethics governance.
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