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Blindsight in normal observers
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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“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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Metadata
- Authors
- Kolb, F. C., & Braun, J.
- Affiliations
- California Institute of Technology (US)
- ORCID
- Braun, Jochen
- 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
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Social Sciences › Arts and Humanities › Philosophy › 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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