ArticleScientific reports2025
Impairment in the behavioral control of body sway, gaze shift, and mental workload in Parkinson's disease.
Article in Scientific reports, 2025. 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
We tested Parkinson's disease (PD)-related impairments in the relationship between gaze shifts, body sway and mental workload while performing visual tasks in the standing position. Nineteen on-drug PD patients (Hoehn and Yahr I-II; MDS-UPDRS score part III: 23.37 ± 2.79) and twenty age-matched controls explored large images (visual angle: 100°) and performed a search task (location of targets within images) as well as a free-viewing (control) task. To collect kinematic data, all participants wore body markers (lower back, upper back and head) and an eye tracker. PD patients showed a higher amplitude in gaze shifts and body sway than age-matched controls. The adaptation of gaze shift and body sway velocity from free-viewing to searching was smaller in PD patients. The mental workload (NASA-TLX score) was a significant covariate in all participants. Furthermore, the MDS-UPDRS score was a significant covariate in the shared variance between body (lower back, upper back and head) and eye movement, thus showing a relation between this clinical variable and impairment at the behavioral level. Our results indicate impaired behavioral synergic, i.e. complementary, control between vision, posture and mental workload in PD patients. With a view to restoring synergic functional control, rehabilitation programs should train the three systems together simultaneously.
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