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  7T CBV fMRI reveals cortical microcircuits of bottom-up saliency in the human brain

Zhang, P., Liu, C., Liu, C., & Zhaoping, L. (2024). 7T CBV fMRI reveals cortical microcircuits of bottom-up saliency in the human brain. In Twenty-Fourth Annual Meeting of the Vision Sciences Society (VSS 2024) (pp. 71).

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Item Permalink: https://hdl.handle.net/21.11116/0000-000D-2EE8-B Version Permalink: https://hdl.handle.net/21.11116/0000-000F-515C-F
Genre: Meeting Abstract

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https://www.visionsciences.org/documents/VSS_2024_Abstracts.pdf (Publisher version)
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 Creators:
Zhang, P, Author
Liu, C, Author
Liu, C, Author
Zhaoping, L1, Author                 
Affiliations:
1Department of Sensory and Sensorimotor Systems, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_3017467              

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 Abstract: A visual item in sharp contrast with its neighbors automatically captures attention. Whether bottom-up saliency signals arise initially in the primary visual cortex (V1) or in the parietal cortex is still controversial. To distinguish these two hypotheses, we investigated the cortical microcircuits of bottom-up saliency with cortical layer-dependent CBV fMRI at 7 Tesla. Behavioral experiments measured the contrast detection performance to orientation singletons presented either at low (15 degrees) or high (90 degrees) orientation contrast within uniformly oriented background bars. Contrast sensitivity was higher to singletons with high compared to low orientation contrast. CBV-weighted fMRI results showed that the orientation-saliency signal was strongest in the superficial layers of V1, and peaked in the middle layers of V2/V3 and the intraparietal sulcus (IPS). Contrast sensitivities of the orientation singletons also correlated with CBV signals in the superficial layers of V1. These findings support the hypothesis that bottom-up saliency map is initially created by iso-feature suppression through lateral inhibition in V1 superficial layers, and then projects to the parietal cortex through the feedforward connection.

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 Dates: 2024-05
 Publication Status: Published online
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Title: Twenty-Fourth Annual Meeting of the Vision Sciences Society (VSS 2024)
Place of Event: St. Pete Beach, FL, USA
Start-/End Date: 2024-05-17 - 2024-05-22

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Title: Twenty-Fourth Annual Meeting of the Vision Sciences Society (VSS 2024)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 71 Identifier: -