Identification of a subpopulation of substantia nigra pars compacta ?-aminobutyric acid neurons that is regulated by basal ganglia activity
Bibliographic record
Abstract
In this report, the authors provide a novel description of a population of gamma-aminobutyric acid-containing neurons in the substantia nigra, pars compacta (SNC). By using metabolic mapping of the immediate-early gene, c-fos, the activation pattern of these cells was characterized with respect to basal ganglia stimulation. Dopaminergic stimulation with d-amphetamine or apomorphine induced Fos expression in the central region of the SNC. However, lesions of the nigrostriatal dopamine pathway significantly reduced d-amphetamine- and apomorphine-induced Fos expression in the ipsilateral and contralateral SNC, respectively. Suppression of stimulant-induced Fos expression in the striatum, using antisense oligodeoxynucleotides, also eliminated Fos expression in the ipsilateral SNC, indicating that striatal efferent projections are involved in the activation of these cells. Double-labeling immunohistochemistry revealed that the Fos-positive cells did not express tyrosine hydroxylase but were immunoreactive for glutamic acid decarboxylase. Retrograde labeling of nigrostriatal neurons, combined with Fos immunofluorescence, revealed that these Fos-positive cells did not project to the striatum. Thus, these neurons do not appear to comprise a nondopaminergic nigrostriatal circuit but likely represent locally-projecting interneurons of the substantia nigra.
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How this classification was reachedexpand
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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 teacher head, 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".