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) 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)
- 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 › 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
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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