Positron emission tomography of extra-striatal dopamine release
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Altered dopamine (DA) neurotransmission is implicated in neurological and psychiatric disorders. Positron Emission Tomography (PET) imaging of DA release has mainly been restricted to striatal areas, rich in D2/D 3 receptors, owing to the moderate affinity of the radioligands used. To measure extra-striatal DA release, where D2/D3 receptor concentrations are much smaller, an approach using a high affinity radioligand, such as [18F]Fallypride, is required. The aim of the present study was to investigate in healthy volunteers the suitability of [ 18F]Fallypride to measure variations in D2/D3 receptor occupancy, as a function of amphetamine-induced DA release, in extra-striatal regions. Six healthy male volunteers underwent two 18F-Fallypride PET sessions, following the double-blind oral administration of 0.3 mg/kg of d-amphetamine (Dexedrine) or placebo (lactose), counter-balanced for order. Following amphetamine administration, D2/D3 receptor occupancy of 18F-Fallypride was significantly reduced in striatum, but also in extra-striatal regions, including substantia nigra, amygdala, thalamus, hippocampus, and cortical areas.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 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 it