Evidence for Problems #

Every substantive claim on the Problems page is checked against current research. Here is each claim, how well today’s evidence supports it, and the sources. The full, de-duplicated source list lives on the references page.

Supported · strong evidence — Memory techniques like association and visualization (e.g., method of loci, keyword mnemonics) help you remember content far longer than usual study practices.

A 2025 systematic review/meta-analysis confirms visuospatial mnemonics produce large gains over plain rehearsal, and the advantage persists at delayed recall, directly supporting the manual’s ‘far longer than usual practices’ claim. Excerpt blends two verbatim effect-size statements from the paper.

Sources: Ondrej et al. (2025), British Journal of Psychology, doi:10.1111/bjop.12799 · PMC12514325 (2025)

Supported · strong evidence — Memory techniques like association and visualization (e.g., method of loci, keyword mnemonics) help you remember content far longer than usual study practices.

A frequently-cited RCT-style training study showing novice gains from a memory-palace technique were large and still present four months later, supporting the durability/‘far longer’ framing.

Sources: Dresler et al. (2017), Neuron 93(5):1227-1235 · PMC5439266

Supported · moderate evidence — Many of these techniques need practice and experience to make them work effectively for you.

Supported but worth qualifying: fast, fluent mnemonic encoding does require considerable practice, yet even short, novice-level training produces large benefits, so practice improves rather than gatekeeps effectiveness. The manual’s claim is correct in spirit; it slightly understates how quickly novices benefit.

Sources: Ondrej et al. (2025), British Journal of Psychology · Dresler et al. (2017), Neuron · Kliegl et al. (1987)

Supported · strong evidence — These techniques still need review; without regular review you will not retain the content you have stored.

The need for review is among the most robust findings in cognitive psychology (the spacing/distributed-practice effect). Paraphrase of the consensus the Cepeda review quantitatively established; the manual’s review warning is well-supported. Note the cited 2026 arXiv pieces restate this consensus rather than overturning it.

Sources: Cepeda et al. (2006), Psychological Bulletin 132(3):354-380 · Kang (2016) review of spaced repetition · Single-paper meta-analyses of spaced retrieval practice, Int. J. STEM Education (2024), doi:10.1186/s40594-024-00468-5

Supported · moderate evidence — These techniques still need review; without regular review you will not retain the content you have stored.

Directly reinforces the manual’s ’no review’ warning: mnemonic associations alone can decay and need to be combined with spaced retrieval/review to hold up long-term. Paraphrase of a recurring caveat in keyword-mnemonic studies.

Sources: Keyword-mnemonic vs retrieval-practice literature, Applied Cognitive Psychology · Learning-Scientists review of mnemonic techniques (2022)

Supported · moderate evidence — Association/visualization works by forming creative, vivid mental links (e.g., linking a camera to a bus); imagery-based links aid memory more than mechanical repetition.

Supports the core mechanism the manual relies on: forming an interactive visual image (not just a verbal association) is what makes the keyword/association method beat rote rehearsal. Paraphrase consolidating consistent findings across keyword-method studies; effects are real but moderate, with experienced learners benefiting less.

Sources: Keyword-mnemonic vs rote-rehearsal studies (concrete/abstract foreign words) · Sagarra & Alba, keyword method in the classroom · Learning-Scientists guide to mnemonic learning techniques (2022)