scholarly journals A comparison of the BOLD fMRI response to achromatic, L/M opponent and S-cone opponent cardinal stimuli in human visual cortex: II. chromatic vs achromatic stimuli

2010 ◽  
Vol 5 (8) ◽  
pp. 265-265
Author(s):  
S. O. Dumoulin ◽  
K. T. Mullen ◽  
K. L. McMahon ◽  
M. Bryant ◽  
G. I. de Zubicaray ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Bold Fmri ◽  
Human Visual Cortex ◽  
Fmri Response

scholarly journals A comparison of the BOLD fMRI response to achromatic, L/M opponent and S-cone opponent cardinal stimuli in human visual cortex: I. perceptually matched vs contrast matched stimuli

2005 ◽  
Vol 5 (8) ◽  
pp. 95-95
Author(s):  
K. T. Mullen ◽  
S. O. Dumoulin ◽  
K. L. McMahon ◽  
M. Bryant ◽  
G. I. de Zubicaray ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Bold Fmri ◽  
Human Visual Cortex ◽  
Fmri Response

scholarly journals Voxel-Wise Linearity Analysis of Increments and Decrements in BOLD Responses in Human Visual Cortex Using a Contrast Adaptation Paradigm

2021 ◽  
Vol 15 ◽  
Author(s):  
Yun Lin ◽  
Xi Zhou ◽  
Yuji Naya ◽  
Justin L. Gardner ◽  
Pei Sun
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Bold Signal ◽  
Transient Responses ◽  
Bold Fmri ◽  
Human Visual Cortex ◽  
Contrast Adaptation ◽  
Bold Responses

The linearity of BOLD responses is a fundamental presumption in most analysis procedures for BOLD fMRI studies. Previous studies have examined the linearity of BOLD signal increments, but less is known about the linearity of BOLD signal decrements. The present study assessed the linearity of both BOLD signal increments and decrements in the human primary visual cortex using a contrast adaptation paradigm. Results showed that both BOLD signal increments and decrements kept linearity to long stimuli (e.g., 3 s, 6 s), yet, deviated from linearity to transient stimuli (e.g., 1 s). Furthermore, a voxel-wise analysis showed that the deviation patterns were different for BOLD signal increments and decrements: while the BOLD signal increments demonstrated a consistent overestimation pattern, the patterns for BOLD signal decrements varied from overestimation to underestimation. Our results suggested that corrections to deviations from linearity of transient responses should consider the different effects of BOLD signal increments and decrements.

scholarly journals Transient Attention Enhances Perceptual Performance and fMRI Response in Human Visual Cortex

Neuron ◽  
2005 ◽  
Vol 45 (3) ◽  
pp. 469-477 ◽  
Author(s):  
Taosheng Liu ◽  
Franco Pestilli ◽  
Marisa Carrasco
Keyword(s):  
Visual Cortex ◽  
Human Visual Cortex ◽  
Perceptual Performance ◽  
Fmri Response

scholarly journals Differential effects of aquaporin-4 channel inhibition on BOLD fMRI and Diffusion fMRI responses in rat visual cortex

2020 ◽  
Author(s):  
Yuji Komaki ◽  
Clément Debacker ◽  
Boucif Djemai ◽  
Luisa Ciobanu ◽  
Tomokazu Tsurugizawa ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Channel Blocker ◽  
Visual Stimulation ◽  
Aquaporin 4 ◽  
Coupling Mechanism ◽  
Bold Fmri ◽  
Channel Inhibition ◽  
Electrophysiological Responses ◽  
Fmri Response ◽  
And Diffusion

AbstractThe contribution of astrocytes to the BOLD fMRI and DfMRI responses in visual cortex of mice following visual stimulation were investigated an aquaporin 4 (AQP4) channel blocker, TGN-020, acting as an astrocyte function perturbator. Under TGN-020 injection the amplitude of the BOLD fMRI response became significantly higher. In contrast no significant changes in the DfMRI responses and the electrophysiological responses were observed. Those results further confirm the implications of astrocytes in the neurovascular coupling mechanism underlying BOLD fMRI, while DfMRI relies on other, not astrocyte-mediated mechanisms.

scholarly journals Negative BOLD fMRI Response in the Visual Cortex Carries Precise Stimulus-Specific Information

PLoS ONE ◽  
2007 ◽  
Vol 2 (5) ◽  
pp. e410 ◽  
Author(s):  
David Bressler ◽  
Nicole Spotswood ◽  
David Whitney
Keyword(s):  
Visual Cortex ◽  
Specific Information ◽  
Bold Fmri ◽  
Fmri Response ◽  
Negative Bold

scholarly journals Simultaneous task-based BOLD-fMRI and [18-F] FDG functional PET for measurement of neuronal metabolism in the human visual cortex

NeuroImage ◽  
2019 ◽  
Vol 189 ◽  
pp. 258-266 ◽  
Author(s):  
Sharna D. Jamadar ◽  
Phillip GD. Ward ◽  
Shenpeng Li ◽  
Francesco Sforazzini ◽  
Jakub Baran ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Bold Fmri ◽  
Human Visual Cortex ◽  
Neuronal Metabolism
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