Reduced cortical excitability is associated with head impact severity and cognitive symptoms in adolescent football players
Bibliographic record
Abstract
American tackle football is associated with high rates of concussion, leading to neurophysiological disturbances and debilitating clinical symptoms, but previous investigations have largely ignored aperiodic neurophysiological activity. In this study, we use pre- and post-season resting-state magnetoencephalography (MEG) to examine whether concussion during a season of football is related to changes in neurophysiology and whether any such changes are associated with clinical outcomes. Concussion was associated with increased aperiodic exponents in superior frontal cortices, indicating a relative reduction in cortical excitability, which accounted for effects on raw delta and gamma power and was associated with worse cognitive concerns across participants. Subtler effects of non-concussive head-impact exposure on neurophysiology were similar to those of concussion. These findings indicate that concussion alters the excitability of the cortex, similar to much more subtle effects of non-concussive exposure.
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How this classification was reachedexpand
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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| 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 teacher head, 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".