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Does it fit? - Impaired affordance perception after stroke.

Jennifer Randerath1, Lisa Finkel2, Cheryl Shigaki3

  • 1Department of Psychology, University of Konstanz, Germany; Lurija Institute for Rehabilitation and Health Sciences at the University of Konstanz, Schmieder Foundation for Sciences and Research, Allensbach, Germany; Department of Psychological Sciences, University of Missouri, MO, USA.

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Summary

Brain damage affects affordance perception, the ability to judge actions based on body and environment. Both left and right brain damage impair this, highlighting a bilateral network crucial for evaluating interactions with objects.

Keywords:
Affordance perceptionDetection theoryPerceptual sensitivityStroke

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Perception

Background:

  • Affordance perception involves evaluating action possibilities based on personal capabilities and environmental properties.
  • Left brain damage (LBD) typically impairs motor cognition, while right brain damage (RBD) affects visuo-spatial abilities, potentially impacting affordance perception.
  • It remains unclear if motor deficits influence decisions about action opportunities.

Purpose of the Study:

  • To investigate affordance perception in stroke patients with LBD or RBD.
  • To determine if motor-cognitive and visuo-spatial deficits are associated with impaired affordance perception.
  • To explore the neural correlates of affordance perception using voxel-based lesion analysis.

Main Methods:

  • A task assessing hand-aperture fit was administered to 34 stroke patients (LBD/RBD) and 29 healthy controls.
  • Data analyzed using signal detection theory (criterion, perceptual sensitivity, diagnostic accuracy).
  • Voxel-based lesion mapping identified neural correlates of impaired perception.

Main Results:

  • Both LBD and RBD groups showed reduced perceptual sensitivity compared to controls.
  • Worse performance correlated with motor-cognitive deficits in LBD and visuo-spatial deficits in RBD.
  • Lesions in ventro-dorsal regions and the cortex-claustrum-cingulate pathway were associated with reduced sensitivity.

Conclusions:

  • Perceptual sensitivity for affordance judgments relies on motor-cognitive and visuo-spatial processing.
  • Deficits in these processes, common after LBD and RBD, impair affordance perception.
  • Results suggest a bilateral network supports affordance perception, necessitating further research in diagnostics and training.