Somatotopic Arrangement of the Corticospinal Tract at the Medullary Pyramid in the Human Brain
Bibliographic record
Abstract
OBJECTIVES: Somatotopic arrangements of the corticospinal tract (CST) in the human brain have been generally elucidated; however, very little is known about the somatotopy at the medullary pyramid (MP). Using diffusion tensor tractography (DTT), we investigated the somatotopic arrangement of the CST at the MP in the normal human brain. METHODS: We recruited 30 healthy volunteers for this study. Diffusion tensor images were scanned using 1.5 T and the CSTs for hand and leg were obtained using FMRIB software. Normalized DTT was reconstructed using the Montreal Neurological Institute echo-planar imaging template supplied with the SPM software. RESULTS: The hand somatotopy of the CST was located at the medial portion of the MP; in contrast, the leg somatotopy occupied the lateral portion of the MP. CONCLUSIONS: We found that the somatotopies for hand and leg were arranged in the mediolateral direction at the MP in the human brain.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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".