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  1. AU="Tünçok, Ekin"
  2. AU="Roberto Toro"
  3. AU="Bharti Sahu"
  4. AU="Soo-Yeon Choi"
  5. AU="Nono, Sandra"
  6. AU="Diepens, Robin J W"
  7. AU="Baselga-Garriga, Clara"

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  1. Artikel: Spatial attention alters visual cortical representation during target anticipation.

    Tünçok, Ekin / Carrasco, Marisa / Winawer, Jonathan

    bioRxiv : the preprint server for biology

    2024  

    Abstract: Attention enables us to efficiently and flexibly interact with the environment by prioritizing some image features in preparation for responding to a stimulus. Using a concurrent psychophysics- fMRI experiment, we investigated how covert spatial ... ...

    Abstract Attention enables us to efficiently and flexibly interact with the environment by prioritizing some image features in preparation for responding to a stimulus. Using a concurrent psychophysics- fMRI experiment, we investigated how covert spatial attention affects responses in human visual cortex prior to target onset, and how it affects subsequent behavioral performance. Performance improved at cued locations and worsened at uncued locations, relative to distributed attention, demonstrating a selective tradeoff in processing. Pre-target BOLD responses in cortical visual field maps changed in two ways: First, there was a stimulus-independent baseline shift, positive in map locations near the cued location and negative elsewhere, paralleling the behavioral results. Second, population receptive field centers shifted toward the attended location. Both effects increased in higher visual areas. Together, the results show that spatial attention has large effects on visual cortex prior to target appearance, altering neural response properties throughout and across multiple visual field maps.
    Sprache Englisch
    Erscheinungsdatum 2024-05-07
    Erscheinungsland United States
    Dokumenttyp Preprint
    DOI 10.1101/2024.03.02.583127
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Comparing retinotopic maps of children and adults reveals a late-stage change in how V1 samples the visual field.

    Himmelberg, Marc M / Tünçok, Ekin / Gomez, Jesse / Grill-Spector, Kalanit / Carrasco, Marisa / Winawer, Jonathan

    Nature communications

    2023  Band 14, Heft 1, Seite(n) 1561

    Abstract: Adult visual performance differs with angular location -it is better for stimuli along the horizontal than vertical, and lower than upper vertical meridian of the visual field. These perceptual asymmetries are paralleled by asymmetries in cortical ... ...

    Abstract Adult visual performance differs with angular location -it is better for stimuli along the horizontal than vertical, and lower than upper vertical meridian of the visual field. These perceptual asymmetries are paralleled by asymmetries in cortical surface area in primary visual cortex (V1). Children, unlike adults, have similar visual performance at the lower and upper vertical meridian. Do children have similar V1 surface area representing the upper and lower vertical meridian? Using MRI, we measure the surface area of retinotopic maps (V1-V3) in children and adults. Many features of the maps are similar between groups, including greater V1 surface area for the horizontal than vertical meridian. However, unlike adults, children have a similar amount of V1 surface area representing the lower and upper vertical meridian. These data reveal a late-stage change in V1 organization that may relate to the emergence of the visual performance asymmetry along the vertical meridian by adulthood.
    Mesh-Begriff(e) Humans ; Adult ; Child ; Visual Fields ; Visual Cortex/diagnostic imaging ; Visual Pathways ; Brain Mapping ; Magnetic Resonance Imaging
    Sprache Englisch
    Erscheinungsdatum 2023-03-21
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-37280-8
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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