Neuronal heterogeneity in the medial septum and diagonal band of Broca: classes and continua
Bibliographic record
Abstract
SUMMARY The medial septum and diagonal band of Broca (MSDB) is known for its diverse populations of cholinergic, GABAergic, and glutamatergic neurons, each contributing to various cognitive processes. However, cell-specific manipulations within this region often result in incongruous behavioral outcomes and reach conflicting conclusions, likely because of a hitherto unknown molecular complexity in its cellular landscape. In this study, we employed single-cell RNA sequencing to thoroughly describe the heterogeneity of MSDB neurons. We confirmed previously established neuronal classes, found gene expression gradients within them and revealed genetically defined subclusters. Moreover, we characterized the genetic profiles of these neuronal subclusters and mapped their spatial distribution. Our analysis presents a comprehensive description of the heterogeneity of MSDB neurons, provides marker genes to target them, explains previous paradoxical results, and opens unexplored avenues to study the impact of neuromodulators in the basal forebrain.
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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 | 0.001 | 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 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".