intervention
Definition
Intervention refers to a structured effort to change beliefs, behaviours, or skills in a target population through deliberate psychological or educational means. In conspiracy belief research, interventions have taken forms including analytical priming, informational inoculation, active inoculation, and discernment training, with effects on epistemically unwarranted beliefs ranging from small to moderate (ds = 0.14 to 0.72) and no single approach consistently reducing general conspiracy ideation. In pandemic prevention research, interventions are understood as theory-based programmes designed, implemented, and evaluated within a systematic conceptual framework, specifically one that addresses the information, motivation, and behavioural skills that determine whether individuals adopt and sustain preventive behaviours. Across both domains, the evidence suggests that interventions grounded in explicit theoretical models outperform ad hoc or atheoretical approaches, and that outcome measurement must be matched carefully to what the intervention is actually designed to change.
Sources: O’Mahony et al. (2024), Fisher & Fisher (2023)
Related Terms
- Information—Motivation—Behavioral Skills Model (1 shared article)
- prevention (1 shared article)
- COVID-19 (1 shared article)
- Next pandemic (1 shared article)
- health behavior change (1 shared article)
- inoculation (1 shared article)
- misinformation (1 shared article)
- conspiracy theories (1 shared article)
- discernment (1 shared article)
- critical appraisal (1 shared article)
Applications
Intervention and Inoculation
Inoculation-based interventions expose participants to weakened forms of misinformation before direct encounter, with the goal of building resistance to unfounded conspiracy theories. In two studies totalling 1,766 participants, passive and active inoculation conditions each produced significant reductions in epistemically unwarranted beliefs compared to controls, with effect sizes of d = -0.25 and d = -0.27 respectively, though neither improved critical appraisal of plausible conspiracy theories. Active inoculation, which requires participants to generate arguments interactively rather than receive information passively, is described as engaging more cognitive processes than passive formats.
Sources: O’Mahony et al. (2024)
Intervention and Behavior Change
Pandemic prevention interventions are explicitly framed as instruments of voluntary, widespread, and sustained behaviour change, without which containment of infectious disease is not achievable. A systematic framework for designing and evaluating such interventions specifies that accurate information, personal and social motivation, and concrete behavioural skills each independently determine whether preventive actions are adopted and maintained. Public health responses to COVID-19 that bypassed well-validated behaviour change models were characterised as reactive and ad hoc, with correspondingly limited impact.
Sources: Fisher & Fisher (2023)
Intervention and Discernment
Discernment, defined as the capacity to selectively reject implausible conspiracy theories while preserving openness to plausible ones, emerged as both a measurable outcome and an intervention technique in its own right. Among four conditions compared, only the discernment intervention significantly improved critical appraisal of both plausible and implausible conspiracy theories, whereas inoculation-based interventions improved detection of implausible theories but may have increased scepticism toward plausible ones. This pattern indicates that interventions designed solely to reduce conspiracy belief, without teaching discrimination between warranted and unwarranted scepticism, risk impairing the very reasoning they intend to improve.
Sources: O’Mahony et al. (2024)
