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Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke
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Post-stroke object affordances: An EEG investigation.

Paula J Rowe1, Corinna Haenschel1, Nareg Khachatoorian1

  • 1Cognitive Neuroscience Research Unit, Department of Psychology, City, University of London, United Kingdom.

Brain and Cognition
|November 10, 2020
PubMed
Summary

Stroke survivors may benefit from therapies that leverage object affordances for motor priming. Viewing objects that match grip types (power or precision) activates brain responses, suggesting potential for enhanced upper limb rehabilitation.

Keywords:
EEGMotor primingUpper limb deficits

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Cognitive Psychology

Background:

  • Upper limb function rehabilitation post-stroke is crucial.
  • Object affordances, automatic motor responses to object properties, are observed in healthy brains.
  • The N2 event-related potential (ERP) reflects object affordances in healthy adults.

Purpose of the Study:

  • To investigate if object affordances influence motor preparation in chronic stroke survivors.
  • To analyze event-related potentials (ERPs) associated with object viewing in stroke survivors.

Main Methods:

  • EEG data collected from 10 chronic stroke survivors and 15 healthy controls.
  • Stimuli included objects for power grip, pinch grip, and an empty desk, presented in stereoscopic depth.
  • Analysis focused on N1 and N2 ERP components.

Main Results:

  • Both stroke survivors and healthy controls showed ERP differences between object categories and the empty desk.
  • These differences, observed around 100-370 ms post-stimulus, suggest motor priming related to object affordances.
  • N1 and N2 components indicated affordance effects in both groups.

Conclusions:

  • Object affordances appear to influence motor priming in chronic stroke survivors, similar to healthy individuals.
  • Therapeutic strategies maximizing motor priming through object presentation may aid upper limb function recovery.
  • Further research is needed in acute stroke patients, particularly those with apraxia.