The platyrrhine primate <i>Cebus imitator</i> uses gaze to adjust grasp posture for food handling and withdraw to the mouth
Bibliographic record
Abstract
Abstract Orienting a food item held in the hand to withdraw it to the mouth for eating is mediated by vision in catarrhine anthropoids and by nonvisual strategies in strepsirrhines. The present study asks whether vision contributes to the withdraw in a platyrrhine anthropoid, a member of a monophyletic primate suborder whose stem group diverged from catarrhines about 40 million years ago. We examined gaze and hand use in arboreal fruit picking by the Costa Rican capuchin, Cebus imitator , a platyrrhine known for its skilled object-handling and tool use. Videos clips of reach, grasp and withdraw movements and associated gaze were examined frame-by-frame to assess hand shaping and sensory control of eating. Cebus imitator used vision and touch to reach for and grasp food items with precision or whole hand grasps. They used vision to orient food items held inhand into a precision grip and their withdraw of food items to the mouth was assisted with a vertically oriented hand. The conjoint use of vision, grasp and hand posture by capuchins is discussed in relation to the staged evolution of visual manipulation of objects, one of which is featured in this platyrrhine primate.
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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 | 0.000 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".