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Related Experiment Video

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Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
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Assessing functional reorganization in visual cortex with simulated retinal lesions.

Holly D H Brown1,2,3, André D Gouws1,2, Richard J W Vernon1,2,3

  • 1Department of Psychology, University of York, York, UK.

Brain Structure & Function
|September 16, 2021
PubMed
Summary

Simulating macular degeneration (MD) in healthy individuals showed that visual cortex activity in response to simulated lesions is rare. However, some participants exhibited responses, suggesting top-down feedback may drive activity in these areas.

Keywords:
FeedbackFunctional reorganizationLesion projection zoneMacular degenerationVisual cortexfMRI

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Neuroimaging

Background:

  • Macular degeneration (MD) causes central vision loss, impacting primary visual cortex representations.
  • The responsiveness of cortical regions deprived of visual input remains debated.
  • The origin of reported cortical responses in such cases is unclear.

Purpose of the Study:

  • To investigate cortical responses in simulated macular degeneration (MD).
  • To explore whether retinal lesions lead to sustained visual cortex activity.
  • To examine the role of top-down feedback in visual processing reorganization.

Main Methods:

  • Functional MRI (fMRI) was used to monitor brain activity in normally sighted participants.
  • A transient retinal lesion was simulated using a bright central disk and adaptation.
  • Participants viewed faces, scrambled faces, and grey stimuli during passive and active tasks.
  • A conventional simulated scotoma was used for comparison.

Main Results:

  • The simulated lesion paradigm did not significantly impact responses in the corresponding cortical representation.
  • Most participants showed no stimulus-driven activation within the simulated lesion area.
  • 22% of participants exhibited responses similar to a patient with juvenile MD.
  • Peripheral visual stimulation during a task elicited responses in central representations in controls.

Conclusions:

  • The study provides evidence that simulated MD lesions do not consistently elicit activity in deprived cortical areas.
  • Observed responses in some individuals suggest potential top-down feedback mechanisms.
  • The findings challenge the notion that a specific 'signature of reorganization' is solely found in patients with retinal lesions.