scholarly journals Evaluating the spatial relationship of event-related potential and functional MRI sources in the primary visual cortex

2007 ◽  
Vol 28 (2) ◽  
pp. 134-142 ◽  
Author(s):  
Kevin Whittingstall ◽  
Gerhard Stroink ◽  
Matthias Schmidt
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Primary Visual Cortex ◽  
Spatial Relationship ◽  
Event Related Potential ◽  
Relationship Of

scholarly journals Subdomains within orientation columns of primary visual cortex

2019 ◽  
Vol 5 (6) ◽  
pp. eaaw0807 ◽  
Author(s):  
Ming Li ◽  
Xue Mei Song ◽  
Tao Xu ◽  
Dewen Hu ◽  
Anna Wang Roe ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Accurate Method ◽  
Electrode Position ◽  
Tree Shrews ◽  
Form Processing ◽  
Orientation Columns ◽  
Relationship Of ◽  
First Time ◽  
The Relationship

In the mammalian visual system, early stages of visual form processing begin with orientation-selective neurons in primary visual cortex (V1). In many species (including humans, monkeys, tree shrews, cats, and ferrets), these neurons are organized in a beautifully arrayed pinwheel-like orientation columns, which shift in orientation preference across V1. However, to date, the relationship of orientation architecture to the encoding of multiple elemental aspects of visual contours is still unknown. Here, using a novel, highly accurate method of targeting electrode position, we report for the first time the presence of three subdomains within single orientation domains. We suggest that these zones subserve computation of distinct aspects of visual contours and propose a novel tripartite pinwheel-centered view of an orientation hypercolumn.

Neuropeptide Y-Containing Neurons are Situated Predominantly Outside Cytochrome Oxidase Puffs in Macaque Visual Cortex

1989 ◽  
Vol 2 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Rodrigo O. Kuljis ◽  
Pasko Rakic
Keyword(s):  
Visual Cortex ◽  
Receptive Field ◽  
Neuropeptide Y ◽  
Cytochrome Oxidase ◽  
Primary Visual Cortex ◽  
Spatial Relationship ◽  
Regular Pattern ◽  
Cortical Connectivity ◽  
Local Circuit ◽  
Immunocytochemical Method

AbstractLayers II/III of the primary visual cortex contain a regular pattern of histochemically detectable cytochrome oxidase (CO)-rich “puffs,” which differ from the interpuff regions in their thalamo-cortical and cortico-cortical connectivity, receptive-field properties, and the density of inhibitory GABA-containing synaptic terminals. We used an immunocytochemical method, in combination with cytochrome oxidase histochemistry, to analyze the spatial relationship between neurons that contain neuropeptide Y (NPY) and the CO puffs. Of a total of 606 neurons, only 2.6% of the NPY-containing cells are located in the puffs, whereas the rest are situated in the interpuffs, or at the interface between puffs and interpuffs. The number of NPY-containing neurons in the puffs is substantially less than that expected in an equal volume of the interpuffs (X2 = 13.86; df = 1; P < 0.001).These observations indicate that columns containing the puffs may differ also from those in the interpuff regions in that they contain a unique array of chemically and morphologically distinct local circuit neurons.

Increasing mean airway pressure reduces functional MRI (fMRI) signal in the primary visual cortex

2001 ◽  
Vol 19 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Ingo H. Lorenz ◽  
Christian Kolbitsch ◽  
Christoph Hörmann ◽  
Michael Schocke ◽  
Christian Kremser ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Primary Visual Cortex ◽  
Airway Pressure ◽  
Mean Airway Pressure ◽  
Fmri Signal

scholarly journals Shape Processing Area LO and Illusory Contours

Perception ◽  
10.1068/p6388 ◽  
2009 ◽  
Vol 38 (8) ◽  
pp. 1260-1263 ◽  
Author(s):  
Lee H de-Wit ◽  
Robert W Kentridge ◽  
A David Milner
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Primary Visual Cortex ◽  
Visual Illusions ◽  
Visual Area ◽  
Illusory Contours ◽  
Feedback Effects ◽  
Shape Representations ◽  
Shape Processing

Recent functional MRI has demonstrated that illusory contours can activate the primary visual cortex. Our investigation sought to demonstrate whether this correlation reflects computations performed in the primary visual cortex or feedback effects from shape processing area LO. We explored this in a patient who has a bilateral lesion to LO, but a functionally spared V1. Our data indicate that illusory contours are unable to influence behaviour without visual area LO. Whilst we would not claim that our data provide evidence for the ‘cognitive’ nature of illusory contours, they certainly suggest that illusory contours are dependent upon the computations involved in extracting shape representations in LO. Our data highlight the importance of neuropsychological research in interpreting the role of feedforward and feedback effects in the generation of visual illusions.

scholarly journals Functional MRI reveals spatially specific attentional modulation in human primary visual cortex

1999 ◽  
Vol 96 (4) ◽  
pp. 1663-1668 ◽  
Author(s):  
D. C. Somers ◽  
A. M. Dale ◽  
A. E. Seiffert ◽  
R. B. H. Tootell
Keyword(s):  
Visual Cortex ◽  
Functional Mri ◽  
Primary Visual Cortex ◽  
Attentional Modulation

scholarly journals Effects of phase regression on high-resolution functional MRI of the primary visual cortex

NeuroImage ◽  
2021 ◽  
Vol 227 ◽  
pp. 117631
Author(s):  
Olivia W Stanley ◽  
Alan B Kuurstra ◽  
L Martyn Klassen ◽  
Ravi S Menon ◽  
Joseph S Gati
Keyword(s):  
Visual Cortex ◽  
High Resolution ◽  
Functional Mri ◽  
Primary Visual Cortex
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