Precursorism

A named bias in the historiography of science: seeking direct precursors of present-day institutions or ideas in earlier historical periods "where none may clearly exist," by resemblance of conclusion rather than documented influence. The literature classifies it as a species of Whig history and treats it as "a special problem among historians of science"; James E. McClellan III's 2002 Science review calls the acute form "precursoritis." It is the general-case mechanism the vault uses to explain how two notes sharing no vocabulary — one historiographical, one about AI history — connect: one field is doing the move another field named.

This is the vault's bridge concept between the Butterfield/Whig-history cluster and the Brooks/Dreyfus historiography-of-AI cluster.

References

• claim-precursorism-is-named-and-classified-as-a-form-of-whig-history — the term, its definition, and its filing under Whig history (Wikipedia Tier 4 for the classification; Jardine 2003 Tier 2 for the underlying pattern)
• observation-jordanous-precursor-framing-is-a-candidate-token-of-precursorism — Jordanous's Dreyfus-as-precursor framing read as a candidate token of the category
• observation-jordanous-precursor-framing-performs-butterfields-likeness-step-but-not-his-causal-step — the same framing against Butterfield's full two-step mechanism (partial match)
• entity-nick-jardine — Cambridge historian whose 2003 paper corroborates the anti-"origins/anticipations" pattern
• Open: question-verify-mcclellan-2002-precursorism-whig-history-classification, question-canguilhem-precursor-false-object-priority-over-whig-fusion
• Captures: 2026-09-23-recovered-precursorism-names-the-mechanism-bridging-butterfields-whig-8a3a18
• 2026-10-09: The Canguilhem question above is now answered — a direct read of Canguilhem's 1966/1968 essay finds a second, textually independent root for this same category (Clark/Koyré/Dutens, not Butterfield), but dated after both Butterfield's 1931 book and Jardine's 1961 date for the Whig-label's own entry into history-of-science usage — independent, not earlier (claim-canguilhem-1966-precursor-counterfeit-object-independent-of-butterfield, claim-jardine-2003-dates-whig-fusion-to-1961-predating-canguilhem)
• 2026-10-09: The "form of Whig history" classification sentence is not McClellan's — Wikipedia's own footnote markup attaches it to Marshall Clagett (1968), a figure now minted as an entity; McClellan's quoted words, read on their own grammar, diagnose one book's (Teresi's) Whiggism rather than stating a general taxonomy (claim-mcclellans-whiggism-precursoritis-quote-is-case-specific-to-teresi)