Research foundations

Designed around how
memory and language work.

Two domains of research inform the ecosystem: learning science shapes Vocab, and language knowledge and pedagogy guide Lexicon.

Vocab

Learning science

Research on how people acquire, retain, and strengthen knowledge over time—applied to ambient, low-interruption vocabulary learning.

Spacing effects on long-term recall Retrieval practice and testing effects Interleaving for deeper encoding Contextual variability in learning Desirable difficulty Cognitive load management Attentional interruption Habit formation and environmental cues Passive exposure versus active retrieval Transfer to actual language use

DISTRIBUTED PRACTICE

Space encounters over time

A quantitative synthesis of 317 experiments found that spacing and retention interval jointly shape later recall.

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RETRIEVAL PRACTICE

Ask memory to retrieve

Delayed tests showed stronger retention after recall practice than repeated study, despite lower learner confidence.

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ADAPTIVE SCHEDULING

Learn from each response

Language-learning research demonstrates that trainable memory models can personalize spaced-practice timing.

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Lexicon

Language knowledge & pedagogy

Research on language structure, acquisition, and how knowledge should be organized for effective teaching.

Lexical acquisition Word frequency distributions CEFR and proficiency scales Word families and morphological awareness Polysemy and sense disambiguation Comprehensible definitions Example quality and learnability Learner dictionary design Semantic interference Pronunciation learning Corpus-derived usage data

Lexicon research citations will be added as the pipeline matures. Refer to the Lexicon page for current status.