Daily Sessions of tDCS Improves Mobility in People with PSP and CBD
Bibliographic record
Abstract
BACKGROUND: Many neurodegenerative diseases currently lack any effective form of therapy. Progressive Supranuclear Palsy (PSP) and Corticobasal degeneration (CBD) fall into this category. We hypothesized that transcranial direct current stimulation (tDCS) targeting the motor cortex and midbrain would improve walking capabilities when administered to people living with PSP and CBD during 20 minutes of walking. This hypothesis is supported by past literature suggesting the capacity of tDCS to increase cortical excitability, which in turn enhances motor performance. METHOD: 10 participants (9 with PSP) completed 12 walking sessions over the course of three weeks, where week 1 consisted of SHAM stimulation (a placebo condition), while weeks 2 and 3 involved active tDCS with an anode electrode over Cz (the motor cortex) and a cathode electrode over the right deltoid muscle. Participants were blind to the stimulation received. Gait assessments at the end of week 1 (i.e., the end of the placebo week) were compared to results obtained at the end week 3 (i.e., the final day of stimulation), as well as two weeks after the final stimulation session, to check for any immediate and sustained gait improvements relative to the placebo (SHAM stimulation) phase. Three key gait parameters were examined: walking speed, rhythm, and stability, to quantify enhancements in speed, step cadence, and reduction in stop times as indicators of improved walking ability. RESULT: Despite the small sample size, we found that cadence and velocity were significantly improved two-weeks post-stimulation. More specifically, cadence (steps/min) improved from 73.81 at baseline to 83.57 two-weeks later (t(9) = 3.05, p < .01), and velocity (cm/sec) improved from 41.55 at baseline to 52.04 two weeks later. Improvement was also found for stance percent, but the difference wasn't significant. CONCLUSION: The significant improvements observed (10 to 20% improvement) encourage further investigation of tDCS for improving mobility in the management PSP and CBD. Neuromodulation is safe and a viable approach to improving symptoms in hitherto untreatable neurodegenerative diseases.
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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) | 0.001 | 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) | 0.001 | 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".