Digit‐specific aberrations in the primary somatosensory cortex in Writer's cramp
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Bibliographic record
Abstract
OBJECTIVE: One approach to the treatment of focal hand dystonia (FHD) is via sensory-based training regimes. It is known that FHD patients demonstrate a reduced distance between the representations of digits 1 and 5 and also digits 2 and 5 in primary somatosensory cortex. However, we lack information on the spatial relationships among digits, such as reduced inter-digit spacing or shifts of representations within the cortical areas, and whether aberrations are specific to symptomatic digits. Our aim was to characterize the spatial relationships among individual digits to determine the types of aberrations that exist and whether these are specific to symptomatic digits only. METHODS: Using high-resolution fMRI over a limited volume and surface-based mapping techniques, the cortical representations of all digits of the dystonia-affected hand within the sub-regions of the postcentral gyrus were mapped in patients with task-specific Writer's cramp (WC). RESULTS: In area 3b, digits directly involved in writing (D1, D2 and D3) show reduced inter-digit separation, reversals, and overlapping activation. The thumb representation occupies territory normally occupied by digit 2 in controls. Asymptomatic digits 4 and 5 preserve their inter-digit separation yet shift towards the D1/D2/D3 cluster, suggesting that reduced spacing, not simply digit shifts, are associated with dystonia symptoms. Area 3a was less responsive to sensory input in WC patients providing evidence of reduced afferent drive or top-down modulation to this sub-region. INTERPRETATION: Therapeutic regimes aimed at facilitating inter-digit separation of digits 1, 2 and 3 may promote beneficial plasticity in WC patients.
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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 | 0.000 | 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 it