Dopamine inhibits excitatory synaptic responses in layer I of the rat parasubiculum
Bibliographic record
Abstract
The parasubiculum is a component of the hippocampal formation that projects to the entorhinal cortex and plays an important role in spatial navigation. Dopamine has marked effects on excitatory synaptic transmission in the hippocampus and entorhinal cortex, and the present study investigated the effects of dopamine on evoked field excitatory postsynaptic potentials (fEPSP) in layer I of the rat parasubiculum in vitro. Application of 50 μM dopamine for 15 min resulted in a reduction in the amplitude of fEPSPs to 71 ± 5 % of baseline that was reversed following washout of dopamine. A lower concentration of 10 μM dopamine had no effect. Application of the dopamine D 1 -like receptor antagonist SCH23390 failed to block the reduction in fEPSP amplitude induced by dopamine, but the D 2 -like receptor antagonist sulpiride prevented significant reductions in fEPSPs. Application of sulpiride alone facilitated fEPSP amplitude to 110 ± 3 % of baseline. These findings suggest that strong activation of dopaminergic inputs to the parasubiculum likely results in reduced excitatory synaptic activation of parasubicular neurons which may attenuate activity in their outputs to the entorhinal cortex.
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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 | 0.001 |
| 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".