Influence of Perceptual Load on Attentional Orienting in Post-Stroke Fatigue: A Study of Auditory Evoked Potentials.
William De Doncker, Annapoorna Kuppuswamy
PMID 38339993WHAT IT FOUND
Stroke survivors with high fatigue showed reduced brain responses to unexpected sounds only when background noise was present.
This suggests high perceptual load impairs attentional orienting in fatigue, even when physical performance and early sensory processing remain normal.
Key findings
01High fatigue was associated with a smaller P300a brain response to novel sounds, but only when background noise was present, not in silence.
02Response times were slower in the high fatigue group regardless of noise, while accuracy was not affected by fatigue or noise.
03Early sensory processing (N100) and top-down attention (P300b) were not different between high and low fatigue groups.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
Small sample size (29 participants) limits generalisability. The study excluded those with mid-range fatigue scores, potentially creating an artificial dichotomy that does not reflect the full spectrum of post-stroke fatigue. No direct measure of distractor suppression was taken, so the mechanism remains inferred from EEG markers. Participants were highly screened for minimal physical impairment and no depression, so results may not apply to more severely impaired stroke survivors.
Declared interests
The authors declared no potential conflicts of interest. Funding was provided by the Wellcome Trust.
The easy way to misread this
Do not assume that high fatigue causes a general inability to process sound or a failure of attention. The deficit was specific to orienting to unexpected stimuli under high load; early sensory processing and top-down attention were intact, and physical performance accuracy did not suffer.