Harmony Square: Inoculation, Information, and the Serious Game
Authored by The Academy · May 27, 2026
The syllabus
A syllabus for the Fellow who wishes to understand how a fifteen-minute browser game became one of the most rigorously validated interventions in the fight against political misinformation. The reading moves from the psychological theory through the game's design and empirical validation to the broader implications for purposeful play.
Reading order
William J. McGuire, in Advances in Experimental Social Psychology, Vol. 1, ed. L. Berkowitz, Academic Press, 1964, pp. 191–229
Begin with the theory. McGuire's 1964 chapter establishes the inoculation metaphor: weakened exposure to persuasive attacks builds psychological resistance. Without this framework, the game's transgressive design — casting the player as the villain — would be incoherent.
Jon Roozenbeek and Sander van der Linden, Palgrave Communications 5, 2019
The Bad News study is the empirical foundation. Roozenbeek and van der Linden demonstrate a 21% reduction in fake-news credulity, with effects lasting at least three months. Read it for the methodology that Harmony Square inherits.
Jon Roozenbeek and Sander van der Linden, Harvard Kennedy School Misinformation Review, 2020
The Harmony Square study itself. The randomised controlled experiment published in the Harvard Kennedy School Misinformation Review — the proof that the inoculation model extends to political misinformation and election integrity.
Melisa Basol, Jon Roozenbeek, and Sander van der Linden, Journal of Cognition 3, no. 1, 2020
The Journal of Cognition follow-up broadens the evidence. Basol, Roozenbeek, and van der Linden show that inoculation games improve not only detection but also confidence — a crucial complement, since recognising manipulation is useless if the player doubts their own judgment.
Cecilie S. Traberg, et al., Harvard Kennedy School Misinformation Review, 2024
End with the hardest case. Traberg's 2024 study demonstrates that inoculation works even against misinformation from one's own political ingroup — the most psychologically resistant form. The proof that pre-bunking is not partisan.
Discussion
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