@article{ref1,
title="Overconfidence in visual perception in Parkinson's disease",
journal="European journal of neuroscience",
year="2020",
author="Halperin, Orly and Karni, Roie and Israeli-Korn, Simon and Hassin-Baer, Sharon and Zaidel, Adam",
volume="ePub",
number="ePub",
pages="ePub-ePub",
abstract="Increased dependence on visual cues in Parkinson's disease (PD) can unbalance the  perception-action loop, impair multisensory integration, and affect everyday  function of PD patients. It is currently unknown why PD patients seem to be more  reliant on their visual cues. We hypothesized that PD patients may be overconfident  in the reliability (precision) of their visual cues. In this study we tested  coherent visual motion perception in PD, and probed subjective (self-reported)  confidence in their visual motion perception. Twenty patients with idiopathic PD,  twenty-one healthy aged-matched controls and twenty healthy young adult participants  were presented with visual stimuli of moving dots (random dot kinematograms). They  were asked to report: (1) whether the aggregate motion of dots was to the left or to  the right, and (2) how confident they were that their perceptual discrimination was  correct. Visual motion discrimination thresholds were similar (unimpaired) in PD  compared to the other groups. By contrast, PD patients were significantly  overconfident in their visual perceptual decisions (p = 0.002 and p < 0.001 vs. the  age-matched and young adult groups, respectively). These results suggest intact  visual motion perception, but overestimation of visual cue reliability, in PD. Overconfidence in visual (vs. other, e.g., somatosensory) cues could underlie  increased visual dependence and impaired multisensory/sensorimotor integration in  PD. It could thereby contribute to gait and balance impairments, and affect everyday  activities, such as driving. Future work should investigate and compare PD  confidence in somatosensory function. A better understanding of altered sensory  reliance might open up new avenues to treat debilitating PD symptoms.<p /> <p>Language: en</p>",
language="en",
issn="0953-816X",
doi="10.1111/ejn.15093",
url="http://dx.doi.org/10.1111/ejn.15093"
}