Layer-specific fMRI reflects different neuronal computations at different depths in human V1.
Recent work has established that cerebral blood flow is regulated at a spatial scale that can be resolved by high field fMRI to show cortical columns in humans. While cortical columns represent a cluster of neurons with similar response properties (spanning from the pial surface to the white matter)...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3308958?pdf=render |
| _version_ | 1817977354952114176 |
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| author | Cheryl A Olman Noam Harel David A Feinberg Sheng He Peng Zhang Kamil Ugurbil Essa Yacoub |
| author_facet | Cheryl A Olman Noam Harel David A Feinberg Sheng He Peng Zhang Kamil Ugurbil Essa Yacoub |
| author_sort | Cheryl A Olman |
| collection | DOAJ |
| description | Recent work has established that cerebral blood flow is regulated at a spatial scale that can be resolved by high field fMRI to show cortical columns in humans. While cortical columns represent a cluster of neurons with similar response properties (spanning from the pial surface to the white matter), important information regarding neuronal interactions and computational processes is also contained within a single column, distributed across the six cortical lamina. A basic understanding of underlying neuronal circuitry or computations may be revealed through investigations of the distribution of neural responses at different cortical depths. In this study, we used T(2)-weighted imaging with 0.7 mm (isotropic) resolution to measure fMRI responses at different depths in the gray matter while human subjects observed images with either recognizable or scrambled (physically impossible) objects. Intact and scrambled images were partially occluded, resulting in clusters of activity distributed across primary visual cortex. A subset of the identified clusters of voxels showed a preference for scrambled objects over intact; in these clusters, the fMRI response in middle layers was stronger during the presentation of scrambled objects than during the presentation of intact objects. A second experiment, using stimuli targeted at either the magnocellular or the parvocellular visual pathway, shows that laminar profiles in response to parvocellular-targeted stimuli peak in more superficial layers. These findings provide new evidence for the differential sensitivity of high-field fMRI to modulations of the neural responses at different cortical depths. |
| first_indexed | 2024-04-13T22:15:17Z |
| format | Article |
| id | doaj.art-168ba6c035164236ae10d983632d7ede |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-13T22:15:17Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-168ba6c035164236ae10d983632d7ede2022-12-22T02:27:32ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0173e3253610.1371/journal.pone.0032536Layer-specific fMRI reflects different neuronal computations at different depths in human V1.Cheryl A OlmanNoam HarelDavid A FeinbergSheng HePeng ZhangKamil UgurbilEssa YacoubRecent work has established that cerebral blood flow is regulated at a spatial scale that can be resolved by high field fMRI to show cortical columns in humans. While cortical columns represent a cluster of neurons with similar response properties (spanning from the pial surface to the white matter), important information regarding neuronal interactions and computational processes is also contained within a single column, distributed across the six cortical lamina. A basic understanding of underlying neuronal circuitry or computations may be revealed through investigations of the distribution of neural responses at different cortical depths. In this study, we used T(2)-weighted imaging with 0.7 mm (isotropic) resolution to measure fMRI responses at different depths in the gray matter while human subjects observed images with either recognizable or scrambled (physically impossible) objects. Intact and scrambled images were partially occluded, resulting in clusters of activity distributed across primary visual cortex. A subset of the identified clusters of voxels showed a preference for scrambled objects over intact; in these clusters, the fMRI response in middle layers was stronger during the presentation of scrambled objects than during the presentation of intact objects. A second experiment, using stimuli targeted at either the magnocellular or the parvocellular visual pathway, shows that laminar profiles in response to parvocellular-targeted stimuli peak in more superficial layers. These findings provide new evidence for the differential sensitivity of high-field fMRI to modulations of the neural responses at different cortical depths.http://europepmc.org/articles/PMC3308958?pdf=render |
| spellingShingle | Cheryl A Olman Noam Harel David A Feinberg Sheng He Peng Zhang Kamil Ugurbil Essa Yacoub Layer-specific fMRI reflects different neuronal computations at different depths in human V1. PLoS ONE |
| title | Layer-specific fMRI reflects different neuronal computations at different depths in human V1. |
| title_full | Layer-specific fMRI reflects different neuronal computations at different depths in human V1. |
| title_fullStr | Layer-specific fMRI reflects different neuronal computations at different depths in human V1. |
| title_full_unstemmed | Layer-specific fMRI reflects different neuronal computations at different depths in human V1. |
| title_short | Layer-specific fMRI reflects different neuronal computations at different depths in human V1. |
| title_sort | layer specific fmri reflects different neuronal computations at different depths in human v1 |
| url | http://europepmc.org/articles/PMC3308958?pdf=render |
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