Ancient Use of Coca Leaves in the Peruvian Central Highlands
Bibliographic record
Abstract
Coca, of the genus Erythroxylum, is a stimulant and painkiller that played key roles within the Inka state. As reported by the early Spanish chroniclers, coca was the most important plant offering during public rituals. Likewise, important landmarks within the Inka domain regularly received offerings of this precious leaf. Its high value is indicated by the fact that not only the living chewed the leaves on a regular basis, but also the dead carried coca leaves in their mouths. We still do not know when coca leaves were first used in the Peruvian central highlands. This uncertainty is largely due to the lack of coca leaves recovered from highland archaeological sites. Several leaves recently found at Convento in the northern part of the Ayacucho Valley are the first direct evidence from an archaeological context that, based on ceramic stylistic grounds, dates to sometime between the end of the Early Intermediate Period (ca. 1–550 ce) and the beginning of the Middle Horizon Period (ca. 550–1100 ce). The botanical identification also indicates that the source of the coca was the Pacific coast. This paper reports this unique finding and discusses its implications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot 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.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
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.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".