scholarly journals Attentional modulation of perceptual grouping in human visual cortex: Functional MRI studies

2005 ◽  
Vol 25 (4) ◽  
pp. 424-432 ◽  
Author(s):  
Shihui Han ◽  
Yi Jiang ◽  
Lihua Mao ◽  
Glyn W. Humphreys ◽  
Hua Gu
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Perceptual Grouping ◽  
Attentional Modulation ◽  
Human Visual Cortex ◽  
Mri Studies

scholarly journals Attentional modulation of perceptual grouping in human visual cortex: ERP studies

2005 ◽  
Vol 26 (3) ◽  
pp. 199-209 ◽  
Author(s):  
Shihui Han ◽  
Yi Jiang ◽  
Lihua Mao ◽  
Glyn W. Humphreys ◽  
Jungang Qin
Keyword(s):  
Visual Cortex ◽  
Perceptual Grouping ◽  
Attentional Modulation ◽  
Human Visual Cortex

scholarly journals Perceptual grouping and inverse fMRI activity patterns in human visual cortex

10.1167/8.7.2 ◽  
2008 ◽  
Vol 8 (7) ◽  
pp. 2 ◽  
Author(s):  
Fang Fang ◽  
Daniel Kersten ◽  
Scott O. Murray
Keyword(s):  
Visual Cortex ◽  
Perceptual Grouping ◽  
Activity Patterns ◽  
Human Visual Cortex

Fuzzy clustering of gradient-echo functional MRI in the human visual cortex. Part I: Reproducibility

1997 ◽  
Vol 7 (6) ◽  
pp. 1094-1101 ◽  
Author(s):  
Richard Baumgartner ◽  
Gordon Scarth ◽  
Claudia Teichtmeister ◽  
Ray Somorjai ◽  
Ewald Moser
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Fuzzy Clustering ◽  
Gradient Echo ◽  
Human Visual Cortex

Asymmetrical Activation of Human Visual Cortex Demonstrated by Functional MRI with Monocular Stimulation

NeuroImage ◽  
2001 ◽  
Vol 14 (3) ◽  
pp. 632-641 ◽  
Author(s):  
A.T. Toosy ◽  
D.J. Werring ◽  
G.T. Plant ◽  
E.T. Bullmore ◽  
D.H. Miller ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Human Visual Cortex ◽  
Monocular Stimulation

Texture Segregation in the Human Visual Cortex: A Functional MRI Study

2000 ◽  
Vol 83 (4) ◽  
pp. 2453-2457 ◽  
Author(s):  
Sabine Kastner ◽  
Peter De Weerd ◽  
Leslie G. Ungerleider
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Receptive Fields ◽  
Higher Order ◽  
Checkerboard Pattern ◽  
Texture Segregation ◽  
Human Visual Cortex ◽  
Cell Recording ◽  
Visual Scenes ◽  
Mri Study

The segregation of visual scenes based on contour information is a fundamental process of early vision. Contours can be defined by simple cues, such as luminance, as well as by more complex cues, such as texture. Single-cell recording studies in monkeys suggest that the neural processing of complex contours starts as early as primary visual cortex. Additionally, lesion studies in monkeys indicate an important contribution of higher order areas to these processes. Using functional MRI, we have investigated the level at which neural correlates of texture segregation can be found in the human visual cortex. Activity evoked by line textures, with and without texture-defined boundaries, was compared in five healthy subjects. Areas V1, V2/VP, V4, TEO, and V3A were activated by both kinds of line textures as compared with blank presentations. Textures with boundaries forming a checkerboard pattern, relative to uniform textures, evoked significantly more activity in areas V4, TEO, less reliably in V3A, but not in V1 or V2/VP. These results provide evidence that higher order areas with large receptive fields play an important role in the segregation of visual scenes based on texture-defined boundaries.

Interactions between attention and perceptual grouping in human visual cortex

2006 ◽  
Vol 1078 (1) ◽  
pp. 101-111 ◽  
Author(s):  
W. Khoe ◽  
E. Freeman ◽  
M.G. Woldorff ◽  
G.R. Mangun
Keyword(s):  
Visual Cortex ◽  
Perceptual Grouping ◽  
Human Visual Cortex

scholarly journals Attentional modulation of oscillatory activity in human visual cortex

NeuroImage ◽  
2003 ◽  
Vol 20 (1) ◽  
pp. 98-113 ◽  
Author(s):  
Noriko Yamagishi ◽  
Daniel E Callan ◽  
Naokazu Goda ◽  
Stephen J Anderson ◽  
Yoshikazu Yoshida ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Oscillatory Activity ◽  
Attentional Modulation ◽  
Human Visual Cortex

scholarly journals Attention hinges on tuned normalization strength within human visual cortex

2019 ◽  
Author(s):  
Ilona M. Bloem ◽  
Sam Ling
Keyword(s):  
Visual Cortex ◽  
Attentional Modulation ◽  
Human Visual Cortex ◽  
Divisive Normalization ◽  
Neural Computations ◽  
Do So

AbstractAlthough attention is known to increase the gain of visuocortical responses, its underlying neural computations remain unclear. Here, we used fMRI to test the hypothesis that a neural population’s ability to be modulated by attention is dependent on divisive normalization. To do so, we leveraged the feature-tuned properties of normalization and found that visuocortical responses to stimuli sharing features normalized each other more strongly. Comparing these normalization measures to measures of attentional modulation, we discovered that subpopulations that exhibited stronger normalization also exhibited larger attentional benefits. In a converging experiment, we demonstrated that attentional benefits were greatest when a subpopulation was forced into a state of stronger normalization. We propose a tuned normalization model of attention that parsimoniously accounts for many properties of our results, suggesting that the degree to which a subpopulation exhibits normalization plays a role in dictating its potential for attentional benefits.

scholarly journals Normalization governs attentional modulation within human visual cortex

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Ilona M. Bloem ◽  
Sam Ling
Keyword(s):  
Visual Cortex ◽  
Attentional Modulation ◽  
Human Visual Cortex ◽  
Divisive Normalization ◽  
Neural Computations ◽  
Do So

AbstractAlthough attention is known to increase the gain of visuocortical responses, its underlying neural computations remain unclear. Here, we use fMRI to test the hypothesis that a neural population’s ability to be modulated by attention is dependent on divisive normalization. To do so, we leverage the feature-tuned properties of normalization and find that visuocortical responses to stimuli sharing features normalize each other more strongly. Comparing these normalization measures to measures of attentional modulation, we demonstrate that subpopulations which exhibit stronger normalization also exhibit larger attentional benefits. In a converging experiment, we reveal that attentional benefits are greatest when a subpopulation is forced into a state of stronger normalization. Taken together, these results suggest that the degree to which a subpopulation exhibits normalization plays a role in dictating its potential for attentional benefits.

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