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An intact primary visual cortex is necessary for conscious position perception, study finds (opens in a new tab)

medicalxpress.com · 2026-11-03

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The source study

Intact primary visual cortex to express the feedback signals is necessary for motion-extrapolated perception

Cognitive Science Research · 2026
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A source study was identified, but the study's evidence could not be prepared for claim assessment. The claims below have not been assessed.

Claim 1 of 6Not checkedA new study provides evidence that feedback signals expressed in V1 are necessary for visual awareness of an object's 'predicted' current position.View evidenceHide evidence

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Claim 2 of 6Not checkedThe researchers used the flash-grab effect to dissociate an object's physical position from its perceived position in hemianopic patients with V1 lesions, hemianopic patients with optic radiation damage, and healthy participants.View evidenceHide evidence

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Claim 3 of 6Not checkedPatients with V1 lesions could not see the displaced red bar when the illusion placed it within their blind visual field, but could see it when it was moved beyond the scotoma boundary or into their intact visual field.View evidenceHide evidence

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Claim 4 of 6Not checkedHealthy participants with an artificial scotoma and patients with optic radiation damage but intact V1 could see the displaced red bar within the blind field, suggesting that intact V1 allows the displaced stimulus to remain visible.View evidenceHide evidence

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Claim 5 of 6Not checkedThe study suggests that consciously seeing a stimulus requires V1 to receive position-prediction feedback, and that higher motion areas may still compute the displaced position even when V1 is damaged.View evidenceHide evidence

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Claim 6 of 6Not checkedThe motion-illusion paradigm may have clinical implications for locating damage in the visual pathway in patients with visual field defects.View evidenceHide evidence

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Intact primary visual cortex to express the feedback signals is necessary for motion-extrapolated perception

Cognitive Science Research · 2026

Source record (opens in a new tab)

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Papers considered

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Crossref, PubMed · 16 candidate papers

Selected

Intact primary visual cortex to express the feedback signals is necessary for motion-extrapolated perception

Cognitive Science Research · 2026 · Crossref

Source (opens in a new tab)

And 10 more candidates considered.