ArticleFrontiers in neurology2026
Eyes-closed finger-tapping task for assessing visual dependence in temporal motor control in Parkinson's disease.
Article in Frontiers in neurology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Impaired motor automaticity in Parkinson's disease (PD) may increase reliance on visual feedback, but its role in stabilizing repetitive movements remains unclear. Objective: To quantify the effect of eye closure on finger tapping and identify performance features reflecting visual dependence in PD. Methods: Forty-five individuals with PD (74.0 ± 6.6 years; 21 women) and 20 age-matched healthy controls (HC; 74.6 ± 5.5 years; 13 women) performed 10-s index finger-to-thumb tapping under eyes-open and eyes-closed conditions. A wearable device recorded metacarpophalangeal flexion-extension angles at 1 kHz, with 30-Hz low-pass filtering. Six metrics were computed: the mean and variability of amplitude, velocity, and inter-peak interval. Eye-closure effects were estimated as r = ln(closed/open) and analyzed using a linear mixed-effects model with group, side, age, and sex as fixed effects and subject as a random intercept. Results: A nominal group effect was observed only for interval variability ( Conclusion: The opposing numerical changes in tapping-interval variability in the PD and HC groups raise the possibility that visual input may contribute differently to temporal stability during repetitive movements in the two groups, warranting further investigation.
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