AI-generated conjecture · a wager, not a finding
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The hands whose sex will not resolve
Status is derived only from the shepherd-authored triage/prediction data above -- community submissions and claims are a separate overlay and can never change it (see the participation panel below).
Claim (verbatim)
Dean Snow's 2013 study (American Antiquity 78/4) applied a sexual-dimorphism discriminant - relative finger lengths, chiefly the index-to-ring and index-to-little ratios - to Upper Palaeolithic hand stencils at Gargas, Pech Merle and other caves, and concluded that a clear majority, about three-quarters, were made by women, overturning a default assumption of male hunter-artists. The result is widely cited as recovering the sex of the vanished makers. But the discriminant is the weak link: applied to modern hands of known sex it classifies correctly only around 60 percent of the time, barely above a coin, and the archaeological stencils are smeared, size-distorted by the stencilling gesture, and often incomplete. The genuinely missing knowledge here is the sex of the makers; the disciplined question is whether the present corpus and method can resolve it at all. If a discriminant with roughly 60 percent accuracy is pushed through a modest sample, the confidence interval on the female fraction should be wide enough to swallow parity, so that a headline '75 percent female' is a point estimate floating on undecidable noise rather than a recovered fact.
Prediction clause (verbatim)
Prediction: propagating the discriminant's own cross-validated misclassification rate (about 0.4) through Snow's published per-stencil measurements by a misclassification-corrected estimator with a bootstrap over the measured hands, the 95 percent confidence interval on the female fraction across the stencil corpus will include 0.5 (primary clause: the CI covers parity), so the female-majority claim does not survive at 95 percent confidence. Disambiguation: only stencils Snow scored as measurable enter the bootstrap; stencils he flagged as indeterminate are excluded, not counted as either sex. Coverage guard: if the measurable-hand sample exceeds 120 and the discriminant's independently validated accuracy exceeds 0.75, the test instead becomes decidable and this conjecture is the one at risk.
Kill-dataset (verbatim)
Kill: Snow (2013, American Antiquity) per-stencil digit-ratio measurements and predicted sexes, combined with the discriminant's cross-validated accuracy from Snow's own modern reference sample (and the critical re-tests of it) - run a misclassification-corrected bootstrap on the female fraction and read whether its 95 percent CI includes 0.5.
Nobody has run this test. The kill-data is named above. If you can run it — or you know the paper that already settles it — claim the kill or submit the prior scholarship. Kills and prior scholarship are credited here, by name, as they come in.
Provenance
Run: Fresh agent generation · model: claude-fable-5
Fresh blind generation by claude-fable-5, 2026-07-17, deep-prehistory wave against real published prehistoric corpora (von Petzinger's Upper-Palaeolithic geometric-sign database; the Bacon et al. 2023 CAJ phenological-notation dataset and its rebuttals; the Marshack vs d'Errico notation re-readings; Snow's hand-stencil digit-ratio tables; the Gargas/Cosquer incomplete-hand catalogues; Blombos/Diepkloof engraved-object inventories; the Reznikoff/Fazenda cave-acoustic surveys; the Geissenkloesterle/Hohle Fels/Isturitz flute corpus and the Divje Babe controversy; Berezkin's Analytical Catalogue and d'Huy's motif phylogenies; Nunn & Reid's 21 drowned-coastline traditions; Mazama/Budj Bim geochronology; Thom's megalithic-yard corpus and Kendall/Freeman reanalyses; Winn's Vinca sign inventory; the Ishango/Lebombo/Border Cave notched bones; the Aubert/Brumm U-series rock-art dataset). Discipline: every kill names a real corpus/database/dataset and a countable, decidable operation (discovery-curve saturation, permutation/ceiling tests, mark-count instability census, misclassification-corrected CIs, configuration-combinatorics, engraved-fraction, geometry-controlled acoustic permutation, survivorship distribution, distribution-geometric motif tests, bathymetric/tephrochronological consistency, Bayesian quantum reanalysis, repertoire-size thresholds, sampling-vs-origin correlation), thresholds far from 1, disambiguation pinned in the prediction, and explicit coverage guards separating taphonomy from ancient absence. Famous controversies (lunar notation, proto-writing, flute-or-bone) enter as decipherment-instability data, not as settled stories. Sound items stay strictly pre-notational (Palaeolithic aerophones and cave resonance) and disjoint from the concurrent ancient-notated-music wave (Hurrian/Greek/Mesopotamian tuning texts) and from the Asian music-scores wave (medieval/early-modern East/South/Southeast-Asian tablatures). Drops: Goebekli Tepe symbol-recurrence and Jiahu incised marks (held back to avoid a third proto-sign repertoire-threshold item; documented in the report as runnable alternates).
Novelty / leakage triage
anticipated in the literature — this exact test has never been run
Snow (2013, American Antiquity 78/4) reported 24 of 32 stencils (~75%) as female via digit-ratio discriminants, and the method's weakness is published - the male/female 2D:4D distributions overlap heavily, and re-tests in the forensic/biological-anthropology and geometric-morphometric literature argue the sex signal is too weak to assign individual stencils. But no located study propagates the discriminant's ~0.4 misclassification rate through a bootstrap to place a 95% CI on the corpus female fraction and read whether it covers 0.5; the critiques stop at 'individually unreliable' rather than computing the aggregate-fraction confidence interval. So the specific arithmetic is unrun, even though its likely direction is anticipated.
- D.R. Snow, 'Sexual dimorphism in European Upper Palaeolithic cave art,' American Antiquity 78(4) (2013)
- 'Is sex estimation from handprints in prehistoric cave art reliable? A view from biological and forensic anthropology,' Journal of Archaeological Science (2014) - located critical re-test (title/journal verified; not the misclassification-corrected fraction CI)
- 'Beyond size: the potential of a geometric morphometric analysis of shape and form for the assessment of sex in hand stencils in rock art,' Journal of Archaeological Science (2016)
Predictions
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