This title appears in the Scientific Report :
2019
Please use the identifier:
http://hdl.handle.net/2128/23077 in citations.
Please use the identifier: http://dx.doi.org/10.1038/s41598-019-45707-w in citations.
Task-dependent functional organizations of the visual ventral stream
Task-dependent functional organizations of the visual ventral stream
The visual hierarchy of the ventral stream has been widely studied. However, it remains unclear how the hierarchical system organizes its functional coupling during top-down cognitive process. The present fMRI study investigated task-dependent functional connectivity along the ventral stream, while...
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Personal Name(s): | Jo, Han-Gue (Corresponding author) |
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Ito, Junji / Schulte Holthausen, Barbara / Baumann, Conrad / Grün, Sonja / Habel, Ute / Kellermann, Thilo | |
Contributing Institute: |
Computational and Systems Neuroscience; INM-6 Computational and Systems Neuroscience; IAS-6 Jara-Institut Brain structure-function relationships; INM-10 |
Published in: | Scientific reports, 9 (2019) 1, S. 9316 |
Imprint: |
[London]
Macmillan Publishers Limited, part of Springer Nature
2019
|
DOI: |
10.1038/s41598-019-45707-w |
PubMed ID: |
31249350 |
Document Type: |
Journal Article |
Research Program: |
Connectivity and Activity |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1038/s41598-019-45707-w in citations.
The visual hierarchy of the ventral stream has been widely studied. However, it remains unclear how the hierarchical system organizes its functional coupling during top-down cognitive process. The present fMRI study investigated task-dependent functional connectivity along the ventral stream, while twenty-eight participants performed object recognition tasks that required different types of visual processing: i) searching or ii) memorizing visual objects embedded in natural scene images or iii) free viewing of the same images. Utilizing a seed-based approach that explicitly compared task-specific BOLD time-series, we identified task-dependent functional connectivity of the visual ventral stream, demonstrating different correlation structures. Searching for a target object manifested both correlated and anti-correlated structures, separating the visual areas V1 and V4 from the posterior part of the inferior temporal cortex (PIT). In contrast, the ventral stream structure remained correlated during memorizing objects, but increased the correlation between the right V4 and PIT. On the other hand, V1 and V4 showed task-dependent activation, whereas PIT was deactivated. These results highlight the context-dependent nature of the visual ventral stream and shed light on how the visual hierarchy is selectively organized to bias object recognition toward features of interest. |