Early Development of Sexual Behavior in Wild Brazilian Capuchin Monkeys (<i>Sapajus Libidinosus</i> and <i>S. Xanthosternos</i>) [Conference Presentation Abstract]
Bibliographic record
Abstract
Humans and other primates exhibit a rich and diverse sexual repertoire that extends beyond reproduction, serving social functions, such bonding, conflict resolution, and status negotiation.Among infants and juveniles, non-reproductive sexual behavior (SB) contributes to obtaining skills essential for adulthood.This study explores the natural development of SB in free-ranging capuchins (Sapajus libidinosus and xanthosternos) from two populations, in the Atlantic rainforest and a wooded savannah in Brazil.We examined 392 hours of video recordings of 16 individuals (8 males, 8 females) during their first three years of life, collected via the 'animal-focal' method.Videos were sorted into behavioral classes (e.g., SB, playing, agonism) and those containing SB were transcribed by two raters using a literature-based ethogram.We quantified behavior frequencies, direction, pre-context and preferred partners.Results reveal early sexual behavior dimorphism, evidenced by differences among males and females in rates of SB, emission and reception, preferred partners.Sociosexual behaviors occurred mostly during play activities, underlining this context as critical for learning adult social dynamics.Females performed sexual behaviors at much lower frequencies than males.Interestingly, although females reproduce earlier and initiate courtship displays as adults, their juvenile SB was less frequent and varied.Understanding how sexual behaviors emerge during early life in non-human primates offers valuable insight into the flexibility of primate (including human) sexuality and its development.These findings provide comparative perspectives on the evolution of sexual behavior, shedding light on how early social interactions might shape (or not) reproductive strategies in both capuchins and humans.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 teacher head, 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".