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Debunking vs. Prebunking Effectiveness

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About This MicroSim

This interactive MicroSim helps students compare the effectiveness of debunking and prebunking strategies by observing how each approach affects belief change in a simulated population.. It supports the learning objectives in Chapter: Misinformation and the Information Age.

How to Use

Use the interactive controls below the drawing area to explore the visualization. Hover over elements for additional information and click to see detailed descriptions.

Iframe Embed Code

You can add this MicroSim to any web page by adding this to your HTML:

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<iframe src="https://dmccreary.github.io/theory-of-knowledge/sims/debunking-vs-prebunking/main.html"
        height="450px"
        width="100%"
        scrolling="no"></iframe>

Lesson Plan

Grade Level

9-12 (High School / IB TOK)

Duration

15-20 minutes

Prerequisites

  • Understanding of what misinformation and disinformation are and how they differ
  • Basic awareness of how information spreads through social networks
  • Familiarity with the TOK concept that shared knowledge can be distorted by bias, emotion, and repetition

Learning Objectives

  • Evaluate the relative effectiveness of debunking (correcting misinformation after it spreads) versus prebunking (inoculating people against misinformation before exposure) by comparing simulation outcomes

Activities

  1. Exploration (5 min): Run the network simulation with no intervention strategy active. Observe how misinformation (shown in red) spreads through the network over time. Note the final percentage of "infected" nodes. Now reset and run the simulation with the debunking strategy active — corrections are introduced after misinformation has already spread. Observe the outcome. Finally, reset and run with the prebunking strategy. Compare the three outcomes: no intervention, debunking, and prebunking. Which strategy resulted in the fewest misinformed nodes?
  2. Guided Practice (10 min): Run at least three comparative trials, varying the parameters (e.g., network density, speed of spread, timing of intervention). With a partner, record the results in a simple table. Discuss: Why does prebunking tend to outperform debunking? Connect this to the TOK concept of the "continued influence effect" — why do corrections often fail to fully undo the damage of initial misinformation? Consider the knowledge question: "What responsibility do knowers have to protect shared knowledge from distortion?" How does this relate to the ethics of knowledge in the digital age?
  3. Assessment (5 min): Imagine you are advising a school on how to prepare students for an upcoming election season filled with political misinformation. Based on your simulation results, write a 4-5 sentence recommendation explaining whether you would prioritize debunking or prebunking, with specific evidence from the sim to support your position. Address the trade-offs: What does your chosen strategy do well, and where does it fall short?

Assessment

  • Students can describe the mechanisms of both debunking and prebunking with accurate terminology
  • Students can use quantitative evidence from the simulation to support a claim about which strategy is more effective
  • Students can connect the simulation outcomes to TOK concepts about shared knowledge, epistemic responsibility, and the persistence of false beliefs

Quiz

Test your understanding with this review question.

1. Research on the "continued influence effect" suggests that once misinformation has been accepted, corrections often fail to fully eliminate its influence on reasoning. Which strategy is specifically designed to address this problem?

  1. Debunking — because it directly corrects the false claim with accurate information
  2. Prebunking — because it builds resistance to misinformation before exposure occurs
  3. Censorship — because it prevents the false claim from being seen at all
  4. Repetition — because repeating the correction enough times will eventually override the false belief
Show Answer

The correct answer is B. Prebunking (also called "inoculation theory") is designed precisely to address the continued influence effect by giving people the cognitive tools to recognize and resist misinformation before they encounter it. Option A describes debunking, which research shows is only partially effective because of the continued influence effect. Option C raises serious ethical and epistemic concerns about suppressing information. Option D is actually counterproductive — research shows that repeating a false claim, even to correct it, can strengthen the false memory through the "illusory truth effect."

Concept Tested: Debunking vs. Prebunking and the Continued Influence Effect

References

  1. Lewandowsky, S., Ecker, U. K. H., Seifert, C. M., Schwarz, N., & Cook, J. (2012). "Misinformation and Its Correction: Continued Influence and Successful Debiasing." Psychological Science in the Public Interest, 13(3), 106-131.
  2. Roozenbeek, J., & van der Linden, S. (2019). "Fake News Game Confers Psychological Resistance Against Online Misinformation." Palgrave Communications, 5, 65.