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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Altered neural oscillations underlying visuospatial processing in cerebral visual impairment.

Alessandra Federici1, Christopher R Bennett2, Corinna M Bauer2

  • 1IMT School for Advanced Studies, 55100 Lucca, Italy.

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|September 11, 2023
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Summary

Individuals with cerebral visual impairment (CVI) show impaired visual search due to altered neural oscillations. This study reveals specific deficits in evoked theta and induced alpha/gamma activity, impacting higher-order visual processing.

Keywords:
cerebral visual impairmentfeedbackfeedforwardneural oscillationsvisual search

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Cerebral visual impairment (CVI) involves brain-based visual disorders affecting central visual pathways, often leading to visuospatial processing deficits.
  • Despite intact visual acuity and fields, the neurophysiological basis of higher-order perceptual impairments in CVI remains unclear, hindering rehabilitation.
  • Understanding these deficits is crucial for developing targeted interventions for individuals with CVI.

Purpose of the Study:

  • To investigate the neurophysiological underpinnings of visuospatial processing deficits in cerebral visual impairment (CVI).
  • To assess visual search performance and associated neural activity using combined eye-tracking and EEG.
  • To identify specific alterations in neural oscillations linked to impaired visual search in CVI.

Main Methods:

  • Utilized a virtual reality-based task with eye tracking and EEG recordings in individuals with CVI and neurotypical controls.
  • Participants performed a visual search task at two difficulty levels, requiring target identification among distractors.
  • Analyzed evoked (phase-locked) and induced (non-phase-locked) neural oscillations across a broad frequency range (4-55 Hz).

Main Results:

  • Individuals with CVI exhibited impaired visual search performance, evidenced by lower success rates, longer reaction times, and increased gaze errors.
  • Markedly reduced early-onset evoked theta activity (4-6 Hz) was observed in CVI participants, irrespective of task difficulty.
  • Controls showed increased induced alpha activity with task difficulty, a modulation absent in CVI. CVI participants also displayed sustained induced gamma activity (30-45 Hz).

Conclusions:

  • Impaired visual search in CVI is associated with widespread alterations in both evoked and induced neural oscillations.
  • Findings suggest involvement of feedforward/feedback and local/distributed neural processing deficits in CVI.
  • The identified neural correlates provide a basis for understanding CVI's impact on visual perception and for future rehabilitative strategies.