scholarly journals Surround suppression in visual cortex: Effects of spatial frequency

2010 ◽  
Vol 9 (8) ◽  
pp. 977-977
Author(s):  
A. B. Sekuler ◽  
L. R. Betts ◽  
E. Roudaia ◽  
Y. Konar ◽  
P. J. Bennett
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency ◽  
Surround Suppression

Surround suppression by high spatial frequency stimuli in the cat primary visual cortex

2011 ◽  
Vol 33 (5) ◽  
pp. 923-932 ◽  
Author(s):  
Hironobu Osaki ◽  
Tomoyuki Naito ◽  
Osamu Sadakane ◽  
Masahiro Okamoto ◽  
Hiromichi Sato
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency ◽  
Primary Visual Cortex ◽  
High Spatial Frequency ◽  
Surround Suppression

scholarly journals Orientation-tuned surround suppression improves computational models of human visual cortex

2015 ◽  
Vol 15 (12) ◽  
pp. 1001
Author(s):  
Catherine Olsson ◽  
Kendrick Kay ◽  
Jonathan Winawer
Keyword(s):  
Visual Cortex ◽  
Computational Models ◽  
Surround Suppression ◽  
Human Visual Cortex

scholarly journals Temporo-nasally biased moving grating selectivity in mouse primary visual cortex

2019 ◽  
Author(s):  
Marie Tolkiehn ◽  
Simon R. Schultz
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency ◽  
Primary Visual Cortex ◽  
Moving Objects ◽  
Direction Selectivity ◽  
Orientation Tuning ◽  
High Signal ◽  
Forward Movement ◽  
Upward Moving

AbstractOrientation tuning in mouse primary visual cortex (V1) has long been reported to have a random or “salt-and-pepper” organisation, lacking the structure found in cats and primates. Laminar in-vivo multi-electrode array recordings here reveal previously elusive structure in the representation of visual patterns in the mouse visual cortex, with temporo-nasally drifting gratings eliciting consistently highest neuronal responses across cortical layers and columns, whilst upward moving gratings reliably evoked the lowest activities. We suggest this bias in direction selectivity to be behaviourally relevant as objects moving into the visual field from the side or behind may pose a predatory threat to the mouse whereas upward moving objects do not. We found furthermore that direction preference and selectivity was affected by stimulus spatial frequency, and that spatial and directional tuning curves showed high signal correlations decreasing with distance between recording sites. In addition, we show that despite this bias in direction selectivity, it is possible to decode stimulus identity and that spatiotemporal features achieve higher accuracy in the decoding task whereas spike count or population counts are sufficient to decode spatial frequencies implying different encoding strategies.Significance statementWe show that temporo-nasally drifting gratings (i.e. opposite the normal visual flow during forward movement) reliably elicit the highest neural activity in mouse primary visual cortex, whereas upward moving gratings reliably evoke the lowest responses. This encoding may be highly behaviourally relevant, as objects approaching from the periphery may pose a threat (e.g. predators), whereas upward moving objects do not. This is a result at odds with the belief that mouse primary visual cortex is randomly organised. Further to this biased representation, we show that direction tuning depends on the underlying spatial frequency and that tuning preference is spatially correlated both across layers and columns and decreases with cortical distance, providing evidence for structural organisation in mouse primary visual cortex.

Parallel Advantage: Further Evidence for Bottom-up Saliency Computation by Human Primary Visual Cortex

Perception ◽  
2022 ◽  
Vol 51 (1) ◽  
pp. 60-69
Author(s):  
Li Zhaoping
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Surround Suppression ◽  
Bottom Up ◽  
Black Disk ◽  
V1 Neurons ◽  
Behavioral Observations ◽  
White Disk ◽  
Special Case

Finding a target among uniformly oriented non-targets is typically faster when this target is perpendicular, rather than parallel, to the non-targets. The V1 Saliency Hypothesis (V1SH), that neurons in the primary visual cortex (V1) signal saliency for exogenous attentional attraction, predicts exactly the opposite in a special case: each target or non-target comprises two equally sized disks displaced from each other by 1.2 disk diameters center-to-center along a line defining its orientation. A target has two white or two black disks. Each non-target has one white disk and one black disk, and thus, unlike the target, activates V1 neurons less when its orientation is parallel rather than perpendicular to the neurons’ preferred orientations. When the target is parallel, rather than perpendicular, to the uniformly oriented non-targets, the target’s evoked V1 response escapes V1’s iso-orientation surround suppression, making the target more salient. I present behavioral observations confirming this prediction.

scholarly journals A Differential Circuit via Retino-Colliculo-Pulvinar Pathway Enhances Feature Selectivity in Visual Cortex through Surround Suppression

Neuron ◽  
2020 ◽  
Vol 105 (2) ◽  
pp. 355-369.e6 ◽  
Author(s):  
Qi Fang ◽  
Xiao-lin Chou ◽  
Bo Peng ◽  
Wen Zhong ◽  
Li I. Zhang ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Surround Suppression ◽  
Differential Circuit ◽  
Feature Selectivity

scholarly journals Orthogonal micro-organization of orientation and spatial frequency in primate primary visual cortex

2012 ◽  
Vol 15 (12) ◽  
pp. 1683-1690 ◽  
Author(s):  
Ian Nauhaus ◽  
Kristina J Nielsen ◽  
Anita A Disney ◽  
Edward M Callaway
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency ◽  
Primary Visual Cortex

The visual cortex as a spatial frequency analyser

1973 ◽  
Vol 13 (7) ◽  
pp. 1255-1267 ◽  
Author(s):  
Lamberto Maffei ◽  
Adriana Fiorentini
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency
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