| Edges, colour and awareness in blindsight. | |
| | |
MedLine Citation:
|
PMID: 20171122 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
It remains unclear what is being processed in blindsight in response to faces, colours, shapes, and patterns. This was investigated in two hemianopes with chromatic and achromatic stimuli with sharp or shallow luminance or chromatic contrast boundaries or temporal onsets. Performance was excellent only when stimuli had sharp spatial boundaries. When discrimination between isoluminant coloured Gaussians was good it declined to chance levels if stimulus onset was slow. The ability to discriminate between instantaneously presented colours in the hemianopic field depended on their luminance, indicating that wavelength discrimination totally independent of other stimulus qualities is absent. When presented with narrow-band colours the hemianopes detected a stimulus maximally effective for S-cones but invisible to M- and L-cones, indicating that blindsight is mediated not just by the mid-brain, which receives no S-cone input, or that the rods contribute to blindsight. The results show that only simple stimulus features are processed in blindsight. |
| | |
Authors:
|
Iona Alexander; Alan Cowey |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-18 |
Journal Detail:
|
Title: Consciousness and cognition Volume: 19 ISSN: 1090-2376 ISO Abbreviation: Conscious Cogn Publication Date: 2010 Jun |
Date Detail:
|
Created Date: 2010-05-07 Completed Date: 2010-08-03 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9303140 Medline TA: Conscious Cogn Country: United States |
Other Details:
|
Languages: eng Pagination: 520-33 Citation Subset: IM |
Copyright Information:
|
2010 Elsevier Inc. All rights reserved. |
Affiliation:
|
University of Oxford, Department of Experimental Psychology, South Parks Road, Oxford OX13UD, UK. iona.alexander@psy.ox.ac.uk |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Awareness
/
physiology* Color Color Perception / physiology* Color Perception Tests Discrimination (Psychology) / physiology Form Perception / physiology* Hemianopsia / physiopathology* Humans Photic Stimulation Time Factors |
| Grant Support | |
ID/Acronym/Agency:
|
//Medical Research Council |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: The role of reversal frequency in learning noisy second order conditional sequences.
Next Document: Quantitative Proteomics Reveals Subset-Specific Viral Recognition in Dendritic Cells.