Cargando…
Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient
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...
Autores principales: | , , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2008
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2507770/ https://www.ncbi.nlm.nih.gov/pubmed/18716654 http://dx.doi.org/10.1371/journal.pone.0003028 |
_version_ | 1782158394572931072 |
---|---|
author | Overgaard, Morten Fehl, Katrin Mouridsen, Kim Bergholt, Bo Cleeremans, Axel |
author_facet | Overgaard, Morten Fehl, Katrin Mouridsen, Kim Bergholt, Bo Cleeremans, Axel |
author_sort | Overgaard, Morten |
collection | PubMed |
description | 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. |
format | Text |
id | pubmed-2507770 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2008 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-25077702008-08-21 Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient Overgaard, Morten Fehl, Katrin Mouridsen, Kim Bergholt, Bo Cleeremans, Axel PLoS One Research Article 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. Public Library of Science 2008-08-21 /pmc/articles/PMC2507770/ /pubmed/18716654 http://dx.doi.org/10.1371/journal.pone.0003028 Text en Overgaard et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Overgaard, Morten Fehl, Katrin Mouridsen, Kim Bergholt, Bo Cleeremans, Axel Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient |
title | Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient |
title_full | Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient |
title_fullStr | Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient |
title_full_unstemmed | Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient |
title_short | Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient |
title_sort | seeing without seeing? degraded conscious vision in a blindsight patient |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2507770/ https://www.ncbi.nlm.nih.gov/pubmed/18716654 http://dx.doi.org/10.1371/journal.pone.0003028 |
work_keys_str_mv | AT overgaardmorten seeingwithoutseeingdegradedconsciousvisioninablindsightpatient AT fehlkatrin seeingwithoutseeingdegradedconsciousvisioninablindsightpatient AT mouridsenkim seeingwithoutseeingdegradedconsciousvisioninablindsightpatient AT bergholtbo seeingwithoutseeingdegradedconsciousvisioninablindsightpatient AT cleeremansaxel seeingwithoutseeingdegradedconsciousvisioninablindsightpatient |