Visual field representation and location of visual area V1 in human visual cortex by functional MRI

2009 ◽  
Author(s):  
Tian-yi Yan ◽  
Feng-zhe Jin ◽  
Jing-long Wu
Keyword(s):  
Visual Cortex ◽  
Visual Field ◽  
Functional Mri ◽  
Visual Area ◽  
Field Representation ◽  
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.

The anatomical and physiological properties of the visual cortex argue against cognitive penetration

2016 ◽  
Vol 39 ◽  
Author(s):  
Moshe Gur
Keyword(s):  
Visual Cortex ◽  
Visual Field ◽  
Spatial Resolution ◽  
Image Representation ◽  
Visual Area ◽  
Cognitive Penetration ◽  
Top Down ◽  
Visual Objects ◽  
Physiological Properties ◽  
Perceptual Abilities

AbstractWe are consciously aware of visual objects together with the minute details that characterize each object. Those details are perceived instantaneously and in parallel. V1 is the only visual area with spatial resolution and topographical exactitude matching perceptual abilities. For cognition to penetrate perception, it needs to affect V1 image representation. That is unlikely because of the detailed parallel V1 organization and the nature of top-down connections, which can influence only large parts of the visual field.

Visual Field Maps of the Human Visual Cortex for Central and Peripheral Vision

2014 ◽  
Vol 1 (2) ◽  
pp. 102-110 ◽  
Author(s):  
Bin Wang ◽  
Hiroki Yamamoto ◽  
Jinglong Wu ◽  
Yoshimichi Ejima
Keyword(s):  
Visual Cortex ◽  
Visual Field ◽  
Peripheral Vision ◽  
Human Visual Cortex ◽  
Visual Field Maps
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