Sources
What Study Lab leans on
Each source, who publishes it, what it supports here, and what it does not.
Test-enhanced learning: taking memory tests improves long-term retention
Psychological Science via PubMed · primary peer reviewed research
Supports specific reported retrieval-practice experiments and delayed retention outcomes.
Does not support validation of this product; one universal study recipe; guaranteed individual outcomes.
The Critical Importance of Retrieval for Learning
Science · primary peer reviewed research
Supports specific reported repeated-retrieval experiments.
Does not support validation of this product; all domains, learners, cues, or schedules.
Distributed practice in verbal recall tasks: A review and quantitative synthesis
Psychological Bulletin via PubMed · quantitative research synthesis
Supports reported spacing effects and interaction with retention interval across included studies.
Does not support one optimal interval for every learner; Jeopardy-specific product efficacy.
Improving metacognitive accuracy: how failing to retrieve practice items reduces overconfidence
Consciousness and Cognition via PubMed · primary peer reviewed research
Supports specific reported retrieval-failure and confidence-calibration experiments.
Does not support universal learner diagnosis; validation of this interface or confidence scale.
Prep Center
Jeopardy Productions · publisher controlled program material
Supports officially described practice surfaces available on the reviewed page.
Does not support Hopper affiliation; endorsement; independent learning-effect claims.
Jeopardy Intelligence architecture
Hopper Labs · product governance
Supports local graph, evidence, privacy, retrieval, and publication boundaries.
Does not support external facts; source rights; learning effectiveness.