Cited by 198Visual perception and processing mechanismsPhilosophy and Theoretical ScienceTactile and Sensory Interactions

Blindsight in normal observers

Kolb, F. Christopher, Braun, Jochen·1995·Nature

Abstract

Some patients with lesions in visual cortex lack conscious visual experience but, when tested, exhibit a significant ability, termed 'blindsight', to discriminate visual stimuli. Here we report two different visual displays that induce blindsight in normal observers. Using an objective measure, we show that conscious experience remains defective at presentation times much longer (1 s) than the onset of visual sensitivity (approximately 60 ms). To obtain this effect, we generate a contrast between visual textures and then conceal the contrast by superimposing 'complementary' textures. Complementarity can involve either opposite motion or binocular rivalry and orthogonal orientation. In both cases, observers locate the texture contrast reliably but do not, by either subjective or objective measures, consciously experience it. Taken together with present knowledge of the visual cortical site(s) at which opposite motion and rivalrous orientation interact, this observation bears upon the functional anatomy of conscious visual experience.

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Crossref · 10.1038/377336a0

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  • Kolb and Braun (1995) created stimuli in which subjects had positive type 1 d′ in a localization task but near-zero metacognitive sensitivity.

    “Kolb and Braun (1995) used binocular presentation and motion patterns to create stimuli in which subjects had positive type 1 d′ (in a localization task), but near-zero metacognitive sensitivity.”

    From How to measure metacognition (2014) · cites this paper as Kolb and Braun (1995)

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Authors
Kolb, F. C., & Braun, J.
Affiliations
California Institute of Technology (US)
Venue
Nature
Published
1995-09
Volume
377
Issue
6547
Pages
336-338
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2100367607
Cited by
198
References
22
Citations by year
2026: 2 · 2025: 4 · 2024: 2 · 2023: 3 · 2022: 4 · 2021: 5 · 2020: 5 · 2018: 4 · 2017: 5 · 2016: 4 · 2015: 10 · 2014: 10 · 2013: 10 · 2012: 5
FWCI
8.50
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Philosophy and Theoretical Science
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
Keywords
blindsight, visual awareness, visual cortex lesions, binocular rivalry
MeSH terms
Humans, Optic Disk, Psychophysics, Visual Cortex, Contrast Sensitivity

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