consider the opposite
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Evidence Ledger · Supports existing guidance · reviewed 2026-09-11
Systematic review and meta-analysis of educational approaches to reduce cognitive biases among students
The reviewed source is consistent with an existing Brali boundary.
Brali decision: Supports existing guidance. This page summarizes a reviewed evidence boundary; it does not reproduce the source and it does not turn one paper into a universal prescription.
What the source supports
Debiasing education can produce a small average improvement on targeted bias tasks. This supports modest expectations for a consider-the-opposite check while making the boundary explicit: depth of learning and transfer to meaningful real-world decisions remain uncertain.
What it does not establish
- A brief consider-the-opposite prompt has a meta-analytically proven effect size of g 0.26.
- Debiasing training reliably transfers to professional and personal decisions.
- All cognitive biases respond similarly to training.
- One educational strategy was established as universally best.
- A small targeted-task effect implies large practical decision improvements.
Important limitations
- All included studies were rated unclear or high risk of bias.
- There was some evidence of publication bias.
- Interventions, bias targets and outcome measures were highly heterogeneous.
- Transfer beyond explicitly trained tasks was limited or uncertain in many studies.
- The pooled effect represents diverse educational interventions rather than the consider-the-opposite strategy alone.
Source context
Systematic review and meta-analysis of educational approaches to reduce cognitive biases among students
- Source type: systematic-review-meta-analysis
- Design: Systematic review of 54 randomized controlled trials with 383 effect sizes and meta-analysis of 160 effects from 41 studies evaluating educational interventions intended to reduce cognitive biases.
- Population: 10,941 participants across the randomized studies, primarily students in educational settings and spanning multiple targeted cognitive biases.
- Exposure / intervention: Educational debiasing approaches including cognitive strategies, feedback, games, instructional materials and multi-component training; some included consider-the-opposite components.
- Outcomes: Performance on targeted cognitive-bias tasks; Bias reduction after educational interventions; Evidence about retention and transfer where reported
Citation: Swaryandini G, Graham J, Griffith S, et al. Nat Hum Behav. 2025;9:2510-2538.
DOI: 10.1038/s41562-025-02253-y
What this changes in Brali
Editorial note: Use as a calibration source: the direction is encouraging, the average effect is small, and real-world transfer must remain an open question.
Use the boundary, not just the headline
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