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Introducing the Truth Effect Database (TED): An open trial-level resource promoting FAIR data in truth effect
1Ruprecht-Karls-University Heidelberg, Hauptstraße 47-51, 69117, Heidelberg, Germany. sven.lesche@psychologie.uni-heidelberg.de.
Behavior Research Methods
|April 16, 2026
Summary
The Truth Effect Database (TED) enhances data sharing for illusory truth effect studies. This open database promotes data interoperability and reusability, advancing psychological science research.
Area of Science:
- Psychological Science
- Open Data Practices
- Cognitive Psychology
Background:
- The FAIR data principles (Findable, Accessible, Interoperable, Reusable) are crucial for open data, but true interoperability and reusability are often limited.
- Existing data practices frequently prioritize findability and accessibility over deeper data integration.
Purpose of the Study:
- Introduce the Truth Effect Database (TED), a novel, large-scale, trial-level open database.
- Harmonize data from illusory truth effect studies to improve interoperability and reusability.
- Provide user-friendly tools for data submission and retrieval.
Main Methods:
- Integrated data from 59 studies across 29 publications, encompassing 12,249 participants and 808,231 trials.
- Developed a custom website for user-friendly data submission.
- Created the R package 'acdcquery' for streamlined data extraction.
- Utilized Bayesian multilevel analyses to examine the illusory truth effect.
Main Results:
- Demonstrated substantial subject-level variance in the illusory truth effect.
- Identified the delay between exposure and judgment phases as a moderator of the truth effect.
- Showcased the utility of TED for advanced statistical analyses.
Conclusions:
- TED provides a foundational infrastructure for advancing research on the illusory truth effect.
- The database supports future meta-analyses, power analyses, replications, and cognitive model development.
- TED serves as a blueprint for sustainable, community-driven database development in psychological science.
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