Overconfidence in visual perception in parkinson's disease

Orly Halperin, Roie Karni, Simon Israeli-Korn, Sharon Hassin-Baer, Adam Zaidel

Research output: Contribution to journalArticlepeer-review

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, 21 healthy aged-matched controls and 20 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 =.002 and p <.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.

Original languageEnglish
Pages (from-to)2027-2039
Number of pages13
JournalEuropean Journal of Neuroscience
Volume53
Issue number6
DOIs
StatePublished - Mar 2021

Keywords

  • Parkinson's disease
  • coherent motion perception
  • confidence
  • random dot kinematogram
  • visual

All Science Journal Classification (ASJC) codes

  • General Neuroscience

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