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Blindsight in normal observers

Kolb, F. Christopher and Braun, Jochen (1995) Blindsight in normal observers. Nature, 377 (6547). pp. 336-338. ISSN 0028-0836. doi:10.1038/377336a0.

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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 (˜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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Additional Information:© 1995 Nature Publishing Group. Supported by the Sloan Foundation and the NSF, Division of Integrative Biology and Neuroscience and Center for Neuromorphic Systems Engineering, as part of the Engineering Research Center Program. We thank P. Perona for facilities, C. Koch for discussion, and A. Dobbins for access to unpublished work on a related topic.
Group:Koch Laboratory (KLAB)
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Sloan FoundationUNSPECIFIED
Division of Integrative Biology and NeuroscienceUNSPECIFIED
Center for Neuromorphic Systems EngineeringUNSPECIFIED
Engineering Research Center at CaltechUNSPECIFIED
Issue or Number:6547
Record Number:CaltechAUTHORS:20130816-103209120
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40451
Deposited By: KLAB Import
Deposited On:26 Jan 2008 03:38
Last Modified:09 Nov 2021 23:49

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