The paraventricular nucleus of the thalamus as an interface between the orexin and CART peptides and the shell of the nucleus accumbens
Bibliographic record
Abstract
The paraventricular nucleus of the thalamus (PVT) receives afferents from the brainstem and has been thought to relay arousal related information to specific limbic forebrain areas, including the nucleus accumbens. More recent anatomical observations suggest that the PVT also receives afferents from various hypothalamic nuclei. The present anatomical experiments investigated the innervation of the PVT by fibers immunoreactive for orexin and cocaine and amphetamine related transcript (CART), two feeding-related peptides highly concentrated in the hypothalamus. Emphasis was placed on identifying the relationship between these neuropeptides and PVT neurons projecting to the shell of the nucleus accumbens (NacSh). Infusion of a retrograde tracer into the NacSh labeled numerous cells of the midline and intralaminar thalamus, most of which were restricted to the PVT. The retrograde tracer, orexin fibers, and CART fibers were immunopositive throughout the entire PVT whereas no overlap between signals was evident within adjacent thalamic regions. High-magnification light and confocal microscopy showed that both orexin and CART fibers made frequent contact with retrogradely labeled neurons throughout the anteroposterior PVT. Furthermore, single PVT cells retrogradely labeled from the NacSh were apposed by both orexin and CART fibers. The present experiments provide the first evidence suggesting a role for the PVT as a relay of hypothalamic activity to the nucleus accumbens. The PVT may function to link visceral arousal signals with limbic regions involved in behavioral responses.
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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) | 0.002 | 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".