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Record W1541320338 · doi:10.4000/pm.715

Périodisation et chronologie des images rupestres du Sahara central

2013· article· fr· W1541320338 on OpenAlexaff
Jean-Loïc Le Quellec

Bibliographic record

VenuePréhistoires méditerranéennes/Préhistoires méditerranéennes/Préhistoire anthropologie méditerranéennes · 2013
Typearticle
Languagefr
FieldSocial Sciences
TopicAfrican Studies and Geopolitics
Canadian institutionsPetro-Canada
Fundersnot available
KeywordsHumanitiesArt

Abstract

fetched live from OpenAlex

Les arts rupestres du Sahara central ont longtemps eu (et subissent parfois encore) la réputation de n’être pas datés. Il est vrai qu’on n’y dispose pas de datations directes comparables à celles obtenues en Europe pour l’art pariétal, mais des recherches récentes permettent de réviser la chronologie de plusieurs écoles artistiques s’étant exprimées dans cette région au cours de l’Holocène. L’art des peintres du style « classique » des Têtes Rondes s’exprime sans doute après 8000±900 cal.BC, mais probablement pas avant le milieu du sixième millénaire cal.BC du fait de l’aride installé à partir de 6200. Viennent ensuite les productions pastorales : les graveurs en « style du Mesāk » s’affirment surtout de 4500 à 4000 cal.BC, alors que, dans la Tasīli-n-Ajjer, la floraison des peintures du « Bovidien » se situe elle aussi dans le cinquième millénaire. Le style d’Iheren se manifeste vers 3000 cal.BC, pour céder la place au style Caballin vers le dernier millénaire avant l’ère commune, et le Camélin clôt la séquence avec l’arrivée du dromadaire, probablement aux environs du cinquième siècle de l’ère commune.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.001
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.035
Threshold uncertainty score0.071

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.001
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0050.006
Science and technology studies0.0010.001
Scholarly communication0.0020.001
Open science0.0000.001
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0080.001

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.035
GPT teacher head0.316
Teacher spread0.281 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designObservational
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations10
Published2013
Admission routes1
Has abstractyes

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