An examination of avian hippocampal neurogenesis in relationship to photoperiod
Bibliographic record
Abstract
More neurons are recruited into the hippocampus of adult black-capped chickadees in the fall than at other times of year. To determine whether declining photoperiod and photorefractoriness are cues stimulating this neuronal recruitment; we examined three groups of chickadees receiving bromodeoxyuridine injections 10 days before being killed: one group was photostimulated with long days (15L), a second group was held on 15L until photorefractory and another group was held on 15L until photorefractory, then moved to short days (8L). Measures of neurogenesis revealed no significant differences in hippocampal neuronal recruitment. However, neuronal recruitment was increased in the hyperpallium apicale of photostimulated birds. These results suggest that declining photoperiod per se is not a major factor regulating enhanced neuronal recruitment to the hippocampus in the fall.
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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 | 0.000 |
| 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 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".