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Neural representations of perspectival shapes and attentional effects: Evidence from fMRI and MEG.
Lin, Yi; Hsu, Yung-Yi; Cheng, Tony; Hsiung, Pin-Cheng; Wu, Chen-Wei; Hsieh, Po-Jang.
Afiliación
  • Lin Y; Taiwan International Graduate Program in Interdisciplinary Neuroscience, National Cheng Kung University and Academia Sinica, Nankan, Taipei, Taiwan; Research Unit Brain and Cognition, KU Leuven, Leuven, Belgium. Electronic address: yi.lin@kuleuven.be.
  • Hsu YY; Department of Psychology, National Taiwan University, Da'an, Taipei, Taiwan.
  • Cheng T; Waseda Institute for Advanced Study, Waseda University, Tokyo, Japan.
  • Hsiung PC; Department of Psychology, National Taiwan University, Da'an, Taipei, Taiwan.
  • Wu CW; Department of Philosophy, Georgia State University, Atlanta, GA, USA.
  • Hsieh PJ; Department of Psychology, National Taiwan University, Da'an, Taipei, Taiwan. Electronic address: hsiehpj@ntu.edu.tw.
Cortex ; 176: 129-143, 2024 Jul.
Article en En | MEDLINE | ID: mdl-38781910
ABSTRACT
Does the human brain represent perspectival shapes, i.e., viewpoint-dependent object shapes, especially in relatively higher-level visual areas such as the lateral occipital cortex? What is the temporal profile of the appearance and disappearance of neural representations of perspectival shapes? And how does attention influence these neural representations? To answer these questions, we employed functional magnetic resonance imaging (fMRI), magnetoencephalography (MEG), and multivariate decoding techniques to investigate spatiotemporal neural representations of perspectival shapes. Participants viewed rotated objects along with the corresponding objective shapes and perspectival shapes (i.e., rotated round, round, and oval) while we measured their brain activities. Our results revealed that shape classifiers trained on the basic shapes (i.e., round and oval) consistently identified neural representations in the lateral occipital cortex corresponding to the perspectival shapes of the viewed objects regardless of attentional manipulations. Additionally, this classification tendency toward the perspectival shapes emerged approximately 200 ms after stimulus presentation. Moreover, attention influenced the spatial dimension as the regions showing the perspectival shape classification tendency propagated from the occipital lobe to the temporal lobe. As for the temporal dimension, attention led to a more robust and enduring classification tendency towards perspectival shapes. In summary, our study outlines a spatiotemporal neural profile for perspectival shapes that suggests a greater degree of perspectival representation than is often acknowledged.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atención / Mapeo Encefálico / Imagen por Resonancia Magnética / Magnetoencefalografía Límite: Adult / Female / Humans / Male Idioma: En Revista: Cortex Año: 2024 Tipo del documento: Article Pais de publicación: Italia
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atención / Mapeo Encefálico / Imagen por Resonancia Magnética / Magnetoencefalografía Límite: Adult / Female / Humans / Male Idioma: En Revista: Cortex Año: 2024 Tipo del documento: Article Pais de publicación: Italia