Bibliographic record
Abstract
To investigate the role of the cerebral cortex in human compensatory postural control, electroencephalography was used to record perturbation-evoked cerebral potentials (PEPS). Previous studies have identified a large negative cerebral potential termed the N1 response (peak latency being 100-200 ms with respect to the perturbation onset), which was accompanied by a positive cerebral potential termed the P2 response (peak latency being 200-500 ms with respect to the perturbation onset). As these studies provided a limited understanding of the role of PEPS in compensatory postural control, the main thesis goals were: (1) to further explore N1 and its relation to sensory processing of the postural perturbation, and (2) to determine whether P2 represented sensorimotor events associated with the control of the postural response. N1 and P2 responses were examined in four interconnected studies which involved: (1) determining whether N1 represented sensory inputs related to the perturbation or sensorimotor events related to the control of evoked balance responses, (2) determining the influence of altered attention on N1 by comparing conditions that featured the presence and absence of a concurrent cognitive task, (3) examining the influence of stimulus predictability on N1, and (4) altering the later components of balance responses in order to establish influence over P2. Based on these studies, there were several important findings that have led to a better understanding of these potentials. Firstly, N1 appeared to represent sensory events related to the perturbation that were independent of ankle automatic postural reactions (APRs). Secondly, N1 appeared to be modulated by altered attention. Thirdly, as opposed to a simple reflection of sensory volume or perturbation intensity, N1 appeared to represent a 'mismatch event detector' that alerted the CNS to unpredictable changes in the perturbation. Lastly, P2 did not appear to represent sensorimotor events related to ankle APRs, suggesting that the control of ankle APRs could mainly reside within subcortical structures. Future work will determine whether the cerebral cortex uses sensory information about the perturbation in order to influence immediate or future postural reactions. Future studies will also examine whether P2 responses might reflect cognitive events associated with postural control.
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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 | 0.000 | 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".