Linear systems analysis for laminar fMRI: Evaluating BOLD amplitude scaling for luminance contrast manipulations
Linear systems analysis for laminar fMRI: Evaluating BOLD amplitude scaling for luminance contrast manipulations
复制标题
层流 fMRI 的线性系统分析:评估亮度对比度操作的 BOLD 幅度缩放
DOI:
10.1038/s41598-020-62165-x
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发表时间:
2020
影响因子:
4.6
通讯作者:
S. Dumoulin
中科院分区:
文献类型:
--
作者:
J. V. van Dijk;A. Fracasso;N. Petridou;S. Dumoulin
A fundamental assumption of nearly all functional magnetic resonance imaging (fMRI) analyses is that the relationship between local neuronal activity and the blood oxygenation level dependent (BOLD) signal can be described as following linear systems theory. With the advent of ultra-high field (7T and higher) MRI scanners, it has become possible to perform sub-millimeter resolution fMRI in humans. A novel and promising application of sub-millimeter fMRI is measuring responses across cortical depth, i.e. laminar imaging. However, the cortical vasculature and associated directional blood pooling towards the pial surface strongly influence the cortical depth-dependent BOLD signal, particularly for gradient-echo BOLD. This directional pooling may potentially affect BOLD linearity across cortical depth. Here we assess whether the amplitude scaling assumption for linear systems theory holds across cortical depth. For this, we use stimuli with different luminance contrasts to elicit different BOLD response amplitudes. We find that BOLD amplitude across cortical depth scales with luminance contrast, and that this scaling is identical across cortical depth. Although nonlinearities may be present for different stimulus configurations and acquisition protocols, our results suggest that the amplitude scaling assumption for linear systems theory across cortical depth holds for luminance contrast manipulations in sub-millimeter laminar BOLD fMRI.
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影响因子:
3.7
作者:
Felleman, Daniel J.;Van Essen, David C.
通讯作者:
Van Essen, David C.
影响因子:
2.5
作者:
Kim JH;Ress D
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Kikinis, Ron
影响因子:
5.7
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Koopmans, Peter J.;Boyacioglu, Rasim;Norris, David G.
通讯作者:
Norris, David G.
DOI:
10.1073/pnas.95.13.7715
发表时间:
1998-06
影响因子:
11.1
作者:
Xiaojin Yang;R. Renken;F. Hyder;Mohamed Siddeek;Charles A. Greer;Gordon M. Shepherd;Robert G. Shulman
通讯作者:
Xiaojin Yang;R. Renken;F. Hyder;Mohamed Siddeek;Charles A. Greer;Gordon M. Shepherd;Robert G. Shulman