A systematic review of bias-mitigation training names considering the opposite as a previously validated way to reduce judgment biases, without testing it itself¶

Claim · All claims
Evidence · 1 study · review r2 · q3 · n=12 studies (17 experiments) reviewed overall
Currency · newest study 2021 · not yet checked against its sources · not reviewed by a person

Deliberately reasoning about hypotheses and evidence that contradict one's initial belief reduces confirmation bias in judgment and evaluation. The strategy operates at the moment of judgment: learners are prompted to ask how the evidence might support the rival view rather than whether it supports their own.

Subclaims¶

q3 i? A systematic review of cognitive-bias-mitigation research identifies "consider the opposite" as an established strategy shown to reduce judgment biases, citing prior experimental work on hindsight bias and anchoring, though the review's own quantitative synthesis addresses retention of bias-mitigation training generally rather than this strategy specifically. → Korteling et al. 2021

Evidence¶

Korteling et al. 2021¶

Korteling, J. E. (Hans), Gerritsma, J. Y. J., & Toet, A. (2021). Retention and transfer of cognitive bias mitigation interventions: A systematic literature study. Frontiers in Psychology, 12, Article 629354. doi:10.3389/fpsyg.2021.629354

q3 · systematic review (PRISMA-based) · i? · no effect size reported for this specific strategy · n=12 studies (17 experiments) reviewed overall · review · r2

This PRISMA-based systematic review screened 86 articles down to 12 studies (17 experiments) on the retention and transfer of cognitive-bias-mitigation interventions, most of them serious-game-based training programs targeting biases such as confirmation bias, anchoring, and bias blind spot. In its background section the authors name "consider the opposite" — prompting people to ask why their initial judgment could be wrong — as a distinct, previously validated debiasing method, citing Arkes, Faust, Guilmette, and Hart (1988) on hindsight bias and Mussweiler, Strack, and Pfeiffer (2000) on anchoring as the supporting primary studies. The review's own 17-experiment dataset does not isolate "consider the opposite" as a manipulation — it evaluates whether other training formats (mainly games) retain their debiasing effects over time — so this entry supports the claim's basic premise (the strategy has documented bias-reducing effects) rather than quantifying its magnitude. Note for the reviewing editor: the two primary studies this review cites for the effect — Lord, Lepper, & Preston (1984), J. Personality and Social Psychology, 47(6), 1231–1243, doi:10.1037/0022-3514.47.6.1231 (the paper that coined the strategy), and Mussweiler, Strack, & Pfeiffer (2000), Pers. Soc. Psychol. Bull., 26(9), 1142–1150, doi:10.1177/01461672002611010 — were confirmed against Crossref for identity, but neither had a readable full text or abstract available (APA/SAGE blocked all access attempts; no open-access copy on OpenAlex or Semantic Scholar; Unpaywall was not used since it requires an email address). They are named here only as leads for a future pass with full-text access, not asserted as evidence entries.

Discussion¶

Mechanism. The mechanism most commonly proposed is that "consider the opposite" works by making disconfirming evidence cognitively available at the moment of judgment: instead of asking learners whether the evidence supports their view (which biases memory search toward confirming cases), they are prompted to ask how the evidence might support the rival view. This reframing is what distinguishes it from generic instructions to "be unbiased," which tend to fail because people believe they are already objective.

Boundary conditions. The strategy should work best when learners have at least some access to disconfirming information — if the evidence base presented is one-sided, considering the opposite has nothing to work with. It also presupposes that learners can generate a plausible opposite; for novices in a domain, the rival hypothesis may be unavailable without scaffolding, suggesting pairing with structured argumentation or case-based learning. Whether the bias reduction transfers beyond the specific judgment task, or persists once the prompt is removed, remains an open question that the evidence section does not yet address.

Design implications. Designers should treat this as a judgment-stage intervention: it is most naturally embedded in activities where learners must evaluate evidence or reach a verdict — debates (especially formats that force learners to argue an assigned position), case analyses, and source evaluation — rather than as a standalone lesson on bias. Prompts should be specific ("list three reasons the opposing interpretation could be correct") rather than general exhortations to objectivity, since the mechanism depends on redirecting the memory search itself.

Evidence status. One source is recorded: a systematic review (Korteling et al. 2021) that names "consider the opposite" as a previously validated debiasing method but does not test it itself; the primary experiments it cites on hindsight bias and anchoring are not recorded here. The claim therefore rests on a second-hand report, its magnitude is unassessed, and it should not be treated as established until primary studies are ingested.

Related Claims¶

• Argumentation improves reasoning. — structured argumentation supplies the rival-hypothesis scaffolding that consider-the-opposite presupposes
• Civic online reasoning instruction improves evaluation. — evaluating online sources is a judgment task where confirmation bias is prominent
• Cognitive disequilibrium motivates conceptual change. — encountering contradictory evidence creates the disequilibrium that opposite-considering exploits
• Cognitive flexibility theory: multiple cases. — multiple representations and cases reduce premature fixation on a single interpretation
• Learners Misjudge Spacing Benefits — related
• Fluent Illusions Mislead Self Assessment — related
• Critical science education requires explicit attention to philosophy of science and rival theories — related
• Critical disposition is least spontaneous when confronting one's most basic prejudices or deeply held convictions — related
• Goffman rejected laboratory experiments because they had not uncovered fields of naturalistic study and fostered bias toward negative cases — related
• Drawing on the positional reflexivity of two researchers with distinct perspectives can function as a strength for cogenerating themes and theory in policy evaluation — related
• Ammons's influential 1956 review concluded that feedback improves learning and motivation without considering the contradictory evidence available to him — related
• Learners design poor experiments: confirmation bias, inconclusive designs, and ineffective variable manipulation are common — related
• Programs should facilitate cognitive disequilibrium so students question ethnocentric views and consider other cultural perspectives — related
• Anchoring-and-adjusting perspective taking saves effort but adjustments systematically fall short — related
• Boundary conditions: some biases fit the two meta-biases only with argument or for some subgroups — related