Unitary synaptic currents between lacunosum‐moleculare interneurones and pyramidal cells in rat hippocampus
Bibliographic record
Abstract
1. Unitary inhibitory postsynaptic currents (uIPSCs) were characterised between 23 synaptically coupled interneurones at the border of stratum radiatum and lacunosum-moleculare (LM) and CA1 pyramidal cells (PYR) using dual whole-cell recordings and morphological identification in rat hippocampal slices. 2. LM interneurones presented a morphology typical of stellate cells, with a fusiform soma as well as dendritic and axonal arborisations in stratum radiatum and lacunosum-moleculare. 3. Single spikes in interneurones triggered uIPSCs in pyramidal cells that were blocked by the GABA(A) antagonist bicuculline and mediated by a chloride conductance. The latency, rise time, duration and decay time constant of uIPSCs were a function of amplitude in all pairs, suggesting a homogeneity in the population sampled. 4. During paired pulse stimulation, individual LM-PYR connections exhibited facilitation or depression. The paired pulse ratio was inversely related to the amplitude of the first response. The transition from facilitation to depression occurred at 26 % of the maximal amplitude of the first uIPSC. Paired pulse depression was not modified by CGP 55845 and thus was GABA(B) receptor independent. 5. CGP 55845 failed to modify the amplitude of uIPSCs, suggesting an absence of tonic presynaptic GABA(B) inhibition at LM-PYR connections. 6. Increasing GABA release by repetitive activation of interneurones failed to induce GABA(B) IPSCs. With extracellular minimal stimulation, increasing stimulation intensity above threshold, or repetitive activation, evoked GABA(B) IPSCs, probably as a result of coactivation of several GABAergic fibres. 7. Thus, dendritic inhibition by LM interneurones involves GABA(A) uIPSCs with kinetics dependent on response amplitude and subject to GABA(B)-independent paired pulse plasticity.
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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) | 0.000 | 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".