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Neural representations underlying mental imagery as unveiled by representation similarity analysis
It is commonly acknowledged that visual imagery and perception rely on the same content-dependent brain areas in the high-level visual cortex (HVC). However, the way in which our brain processes and organizes previous acquired knowledge to allow the generation of mental images is still a matter of d...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8096739/ https://www.ncbi.nlm.nih.gov/pubmed/33821379 http://dx.doi.org/10.1007/s00429-021-02266-z |
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author | Boccia, Maddalena Sulpizio, Valentina Bencivenga, Federica Guariglia, Cecilia Galati, Gaspare |
author_facet | Boccia, Maddalena Sulpizio, Valentina Bencivenga, Federica Guariglia, Cecilia Galati, Gaspare |
author_sort | Boccia, Maddalena |
collection | PubMed |
description | It is commonly acknowledged that visual imagery and perception rely on the same content-dependent brain areas in the high-level visual cortex (HVC). However, the way in which our brain processes and organizes previous acquired knowledge to allow the generation of mental images is still a matter of debate. Here, we performed a representation similarity analysis of three previous fMRI experiments conducted in our laboratory to characterize the neural representation underlying imagery and perception of objects, buildings and faces and to disclose possible dissimilarities in the neural structure of such representations. To this aim, we built representational dissimilarity matrices (RDMs) by computing multivariate distances between the activity patterns associated with each pair of stimuli in the content-dependent areas of the HVC and HC. We found that spatial information is widely coded in the HVC during perception (i.e. RSC, PPA and OPA) and imagery (OPA and PPA). Also, visual information seems to be coded in both preferred and non-preferred regions of the HVC, supporting a distributed view of encoding. Overall, the present results shed light upon the spatial coding of imagined and perceived exemplars in the HVC. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00429-021-02266-z. |
format | Online Article Text |
id | pubmed-8096739 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-80967392021-05-05 Neural representations underlying mental imagery as unveiled by representation similarity analysis Boccia, Maddalena Sulpizio, Valentina Bencivenga, Federica Guariglia, Cecilia Galati, Gaspare Brain Struct Funct Original Article It is commonly acknowledged that visual imagery and perception rely on the same content-dependent brain areas in the high-level visual cortex (HVC). However, the way in which our brain processes and organizes previous acquired knowledge to allow the generation of mental images is still a matter of debate. Here, we performed a representation similarity analysis of three previous fMRI experiments conducted in our laboratory to characterize the neural representation underlying imagery and perception of objects, buildings and faces and to disclose possible dissimilarities in the neural structure of such representations. To this aim, we built representational dissimilarity matrices (RDMs) by computing multivariate distances between the activity patterns associated with each pair of stimuli in the content-dependent areas of the HVC and HC. We found that spatial information is widely coded in the HVC during perception (i.e. RSC, PPA and OPA) and imagery (OPA and PPA). Also, visual information seems to be coded in both preferred and non-preferred regions of the HVC, supporting a distributed view of encoding. Overall, the present results shed light upon the spatial coding of imagined and perceived exemplars in the HVC. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00429-021-02266-z. Springer Berlin Heidelberg 2021-04-05 2021 /pmc/articles/PMC8096739/ /pubmed/33821379 http://dx.doi.org/10.1007/s00429-021-02266-z Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Original Article Boccia, Maddalena Sulpizio, Valentina Bencivenga, Federica Guariglia, Cecilia Galati, Gaspare Neural representations underlying mental imagery as unveiled by representation similarity analysis |
title | Neural representations underlying mental imagery as unveiled by representation similarity analysis |
title_full | Neural representations underlying mental imagery as unveiled by representation similarity analysis |
title_fullStr | Neural representations underlying mental imagery as unveiled by representation similarity analysis |
title_full_unstemmed | Neural representations underlying mental imagery as unveiled by representation similarity analysis |
title_short | Neural representations underlying mental imagery as unveiled by representation similarity analysis |
title_sort | neural representations underlying mental imagery as unveiled by representation similarity analysis |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8096739/ https://www.ncbi.nlm.nih.gov/pubmed/33821379 http://dx.doi.org/10.1007/s00429-021-02266-z |
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