Hippocampal neurogenesis and spatial memory: postnatal neurogenesis in yellow-pine chipmunks and eastern grey squirrels
Bibliographic record
Abstract
Postnatal neurogenesis in wild mammals may play an essential role in spatial memory. I compared two species that differ in their reliance on memory for where food is stored for future consumption. Yellow-pine chipmunks use a single cache to store winter food, whereas eastern grey squirrels use multiple storage sites. In chipmunks, the density of newborn cells in the dentate gyrus was negatively related to the plasma corticosterone concentration, and densities of newborn and young neurons were negatively related to the neutrophil:lymphocyte ratio. No such relationships were found in squirrels. I suggest that the independence in squirrels of cell densities and indicators of condition is an adaptation that prevents decreases in neurogenesis. As compared to chipmunks, squirrels had three times the density of newborn cells in the dentate gyrus, but did not differ in density of young neurons. I discuss four explanations to account for this inconsistency.
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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".