Age- and Sex-Related Variation in Song-Control Regions in Cassin’s Finches, <i>Carpodacus cassinii</i>
Why this work is in the frame
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Bibliographic record
Abstract
Male Cassin's finches (Carpodacus cassinii) sing long, complex songs that incorporate many elements mimicked from other species. Although one-year-old males (males in their first breeding season) are sexually competent and do breed, they sing a simpler song (fewer syllable types) than do males two or more years old (called after-second-year males). Females do occasionally sing, but with much less stereotypy and complexity than breeding males of any age. We collected brains from free-living breeding after-second-year males (identified by their red plumage), one-year-old males (identified by their female-like brown plumage), and adult females to examine sex- and age-related differences in three song-control nuclei: HVC, Area X and RA. Nuclei volumes were reconstructed by measuring the Nissl-defined area in every second section. There was a large sex difference in all three nuclei, with female volumes 40-50% that of males. There was no difference in HVC volume between age classes of males. However, one-year-old (brown) males had significantly larger Area X volume than did the older (red) males, with red males' Area X about 75% the volume of brown males'. These data raise questions regarding the functional significance of Area X and related nuclei in relation to song development in vocal mimics.
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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) | 0.000 | 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 it