scholarly journals Large-scale Contextual Effects in Early Human Visual Cortex

i-Perception ◽  
10.1068/if655 ◽  
2012 ◽  
Vol 3 (9) ◽  
pp. 655-655
Author(s):  
Sung Jun Joo ◽  
Geoffrey M Boynton ◽  
Scott O Murray
Keyword(s):  
Visual Cortex ◽  
Large Scale ◽  
Contextual Effects ◽  
Human Visual Cortex ◽  
Early Human

scholarly journals Long-range, pattern-dependent contextual effects in early human visual cortex

2012 ◽  
Vol 12 (9) ◽  
pp. 1383-1383
Author(s):  
S. O. Murray ◽  
S. J. Joo ◽  
G. M. Boynton
Keyword(s):  
Visual Cortex ◽  
Long Range ◽  
Contextual Effects ◽  
Human Visual Cortex ◽  
Early Human

scholarly journals Long-Range, Pattern-Dependent Contextual Effects in Early Human Visual Cortex

2012 ◽  
Vol 22 (9) ◽  
pp. 781-786 ◽  
Author(s):  
Sung Jun Joo ◽  
Geoffrey M. Boynton ◽  
Scott O. Murray
Keyword(s):  
Visual Cortex ◽  
Long Range ◽  
Contextual Effects ◽  
Human Visual Cortex ◽  
Early Human

scholarly journals Orientation and color tuning of the human visual gamma rhythm

2021 ◽  
Author(s):  
Ye Li ◽  
William Bosking ◽  
Michael S Beauchamp ◽  
Sameer A Sheth ◽  
Daniel Yoshor ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Large Scale ◽  
Brain Activity ◽  
Population Level ◽  
Gamma Oscillations ◽  
Cell Orientation ◽  
Population Activity ◽  
Color Tuning ◽  
Human Visual Cortex ◽  
Gamma Rhythm

Narrowband gamma oscillations (NBG: ~20-60Hz) in visual cortex reflect rhythmic fluctuations in population activity generated by underlying circuits tuned for stimulus location, orientation, and color. Consequently, the amplitude and frequency of induced NBG activity is highly sensitive to these stimulus features. For example, in the non-human primate, NBG displays biases in orientation and color tuning at the population level. Such biases may relate to recent reports describing the large-scale organization of single-cell orientation and color tuning in visual cortex, thus providing a potential bridge between measurements made at different scales. Similar biases in NBG population tuning have been predicted to exist in the human visual cortex, but this has yet to be fully examined. Using intracranial recordings from human visual cortex, we investigated the tuning of NBG to orientation and color, both independently and in conjunction. NBG was shown to display a cardinal orientation bias (horizontal) and also an end- and mid-spectral color bias (red/blue and green). When jointly probed, the cardinal bias for orientation was attenuated and an end-spectral preference for red and blue predominated. These data both elaborate on the close, yet complex, link between the population dynamics driving NBG oscillations and known feature selectivity biases in visual cortex, adding to a growing set of stimulus dependencies associated with the genesis of NBG. Together, these two factors may provide a fruitful testing ground for examining multi-scale models of brain activity, and impose new constraints on the functional significance of the visual gamma rhythm.

scholarly journals Two representations of object size in early human visual cortex

2010 ◽  
Vol 9 (8) ◽  
pp. 37-37
Author(s):  
E. Runeson ◽  
H. Boyaci ◽  
J. McLaughlin ◽  
L. Osterhout ◽  
S. Murray
Keyword(s):  
Visual Cortex ◽  
Object Size ◽  
Human Visual Cortex ◽  
Early Human

scholarly journals The Frequency of Visually Induced Gamma-Band Oscillations Depends on the Size of Early Human Visual Cortex

2012 ◽  
Vol 32 (4) ◽  
pp. 1507-1512 ◽  
Author(s):  
D. S. Schwarzkopf ◽  
D. J. Robertson ◽  
C. Song ◽  
G. R. Barnes ◽  
G. Rees
Keyword(s):  
Visual Cortex ◽  
Gamma Band ◽  
Human Visual Cortex ◽  
Gamma Band Oscillations ◽  
Early Human

Hemifield effects of spatial attention in early human visual cortex

2011 ◽  
Vol 33 (12) ◽  
pp. 2349-2358 ◽  
Author(s):  
Antje Kraft ◽  
Stefanie Kehrer ◽  
Herbert Hagendorf ◽  
Stephan A. Brandt
Keyword(s):  
Visual Cortex ◽  
Spatial Attention ◽  
Human Visual Cortex ◽  
Early Human

scholarly journals Attentional Modulation of Neuromagnetic Evoked Responses in Early Human Visual Cortex and Parietal Lobe following a Rank-Order Rule

2011 ◽  
Vol 31 (48) ◽  
pp. 17622-17636 ◽  
Author(s):  
T. Lennert ◽  
R. Cipriani ◽  
P. Jolicoeur ◽  
D. Cheyne ◽  
J. C. Martinez-Trujillo
Keyword(s):  
Visual Cortex ◽  
Parietal Lobe ◽  
Rank Order ◽  
Evoked Responses ◽  
Attentional Modulation ◽  
Human Visual Cortex ◽  
Early Human ◽  
Order Rule
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