Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient.

PloS One
Morten OvergaardAxel Cleeremans

Abstract

Blindsight patients, whose primary visual cortex is lesioned, exhibit preserved ability to discriminate visual stimuli presented in their "blind" field, yet report no visual awareness hereof. Blindsight is generally studied in experimental investigations of single patients, as very few patients have been given this "diagnosis". In our single case study of patient GR, we ask whether blindsight is best described as unconscious vision, or rather as conscious, yet severely degraded vision. In experiment 1 and 2, we successfully replicate the typical findings of previous studies on blindsight. The third experiment, however, suggests that GR's ability to discriminate amongst visual stimuli does not reflect unconscious vision, but rather degraded, yet conscious vision. As our finding results from using a method for obtaining subjective reports that has not previously used in blindsight studies (but validated in studies of healthy subjects and other patients with brain injury), our results call for a reconsideration of blindsight, and, arguably also of many previous studies of unconscious perception in healthy subjects.

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Citations

Nov 26, 2010·Brain : a Journal of Neurology·Dominic H Ffytche, Semir Zeki
Dec 11, 2013·PloS One·David A LloydJustin A Harris
Mar 19, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Morten Overgaard, Jesper Mogensen
Nov 26, 2009·Journal of Cognitive Neuroscience·Niko A Busch
Sep 1, 2010·Cognitive Neuroscience·Bert TimmermansAxel Cleeremans
Feb 18, 2011·Experimental Brain Research·Morten Overgaard
Apr 12, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Bert TimmermansAxel Cleeremans
Apr 12, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Morten Overgaard, Kristian Sandberg
Dec 15, 2010·Consciousness and Cognition·Berit Brogaard
Nov 26, 2015·Frontiers in Psychology·Mia Y DongMorten Overgaard
Nov 1, 2012·Wiley Interdisciplinary Reviews. Cognitive Science·Morten Overgaard
Jul 28, 2011·Cognitive Science·Berit Brogaard
Aug 31, 2014·Consciousness and Cognition·Morten Overgaard, Jesper Mogensen
Aug 19, 2015·Frontiers in Psychology·Jakub Jonkisz
Apr 18, 2015·Frontiers in Integrative Neuroscience·Semir Zeki
Oct 9, 2014·Frontiers in Psychology·Kristian SandbergMorten Overgaard
May 21, 2016·Frontiers in Psychology·Chiara F TagliabueSilvia Savazzi
Jun 1, 2016·Frontiers in Psychology·Manuel Rausch, Michael Zehetleitner
Jul 6, 2016·Frontiers in Psychology·Chiara MazziSilvia Savazzi
Jul 26, 2016·Frontiers in Systems Neuroscience·Sylvie ChokronCarole Peyrin
Feb 2, 2010·Consciousness and Cognition·Remigiusz Szczepanowski
Apr 12, 2017·Cognitive Science·Peter Fazekas, Morten Overgaard
Jan 28, 2014·The Behavioral and Brain Sciences·Ben R Newell, David R Shanks
Apr 6, 2017·Frontiers in Psychology·Jakub JonkiszMarek Binder
Sep 13, 2011·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Derek G V Mitchell, Steven G Greening
Apr 20, 2013·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Guido Hesselmann
Jan 14, 2020·Restorative Neurology and Neuroscience·Sylvie ChokronCéline Perez
Jun 24, 2020·Proceedings of the National Academy of Sciences of the United States of America·Teresa M SchubertMichael McCloskey
Dec 13, 2016·Scientific Reports·Chen Song, Haishan Yao
Aug 1, 2018·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Morten Overgaard
Apr 11, 2014·The Behavioral and Brain Sciences·David R Shanks, Ben R Newell
Jul 17, 2020·Psychonomic Bulletin & Review·Ali Pournaghdali, Bennett L Schwartz
Mar 20, 2021·Consciousness and Cognition·Michael Pauen, John-Dylan Haynes
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Jun 11, 2019·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Clémentine GarricSylvie Chokron
Apr 15, 2020·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Clémentine GarricSylvie Chokron

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