ArticleScientific reports2026
Novel psychophysical line bisection task using brief stimulus presentation reveals no horizontal bias in left-onset parkinson's disease.
Article in Scientific reports, 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
Some studies have shown that individuals with Parkinson’s disease (PD) with motor-symptom onset on the left side of the body (LPD) show mild neglect-like performance on some tasks, but others have not. Individuals with PD onset on the right side of the body (RPD) have not shown these effects. To clarify whether a bias in the perception of length exists in LPD, we administered a novel line bisection experiment, using psychophysical methods and no motor demands beyond a verbal response to isolate perceptual biases. Experiment 1 used a psychophysical procedure to test 21 LPD, 29 RPD and 28 age-matched healthy control adults (HC) on horizontal line bisection. A vertical line bisection condition was included as a control. Experiment 2 repeated the horizontal condition in a subset of participants, using eye-tracking and a fixation cross to preclude gaze bias. In both experiments, LPD did not demonstrate performance bias that was consistent with hemineglect. In Experiment 1, a bias specific to LPD was demonstrated in the vertical condition. The present results suggest that any neglect-like perceptual shifts occurring in LPD do not occur when psychophysically isolating perceptual decisions from higher-order processes that may be at play in other tasks.
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