scholarly journals The stimulus-evoked population response in visual cortex of awake monkey is a propagating wave

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Lyle Muller ◽  
Alexandre Reynaud ◽  
Frédéric Chavane ◽  
Alain Destexhe
Keyword(s):  
Visual Cortex ◽  
Population Response ◽  
Awake Monkey

Mapping multiple features in the population response of visual cortex

Nature ◽  
2003 ◽  
Vol 423 (6943) ◽  
pp. 986-990 ◽  
Author(s):  
Amit Basole ◽  
Leonard E. White ◽  
David Fitzpatrick
Keyword(s):  
Visual Cortex ◽  
Population Response ◽  
Multiple Features

Binocular Interaction and Sensitivity to Horizontal Disparity in Visual Cortex in the Awake Monkey

2001 ◽  
Vol 107 (3-4) ◽  
pp. 147-160 ◽  
Author(s):  
Francisco Gonzalez ◽  
Rogelio Perez ◽  
Maria S. Justo ◽  
Carlos Ulibarrena
Keyword(s):  
Visual Cortex ◽  
Horizontal Disparity ◽  
Awake Monkey ◽  
Binocular Interaction

High frequency (60–90 Hz) oscillations in primary visual cortex of awake monkey

Neuroreport ◽  
1993 ◽  
Vol 4 (3) ◽  
pp. 243-246 ◽  
Author(s):  
Reinhard Eckhorn ◽  
Axel Frien ◽  
Roman Bauer ◽  
Thomas Woelbern ◽  
Harald Kehr
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
High Frequency ◽  
Awake Monkey

scholarly journals Population Response Profiles in Early Visual Cortex Are Biased in Favor of More Valuable Stimuli

2010 ◽  
Vol 104 (1) ◽  
pp. 76-87 ◽  
Author(s):  
John T. Serences ◽  
Sameer Saproo
Keyword(s):  
Visual Cortex ◽  
Variable Interval ◽  
Population Response ◽  
Relative Value ◽  
Cortical Responses ◽  
Response Profile ◽  
Early Visual Cortex ◽  
Feature Based ◽  
Early Effects

Voluntary and stimulus-driven shifts of attention can modulate the representation of behaviorally relevant stimuli in early areas of visual cortex. In turn, attended items are processed faster and more accurately, facilitating the selection of appropriate behavioral responses. Information processing is also strongly influenced by past experience and recent studies indicate that the learned value of a stimulus can influence relatively late stages of decision making such as the process of selecting a motor response. However, the learned value of a stimulus can also influence the magnitude of cortical responses in early sensory areas such as V1 and S1. These early effects of stimulus value are presumed to improve the quality of sensory representations; however, the nature of these modulations is not clear. They could reflect nonspecific changes in response amplitude associated with changes in general arousal or they could reflect a bias in population responses so that high-value features are represented more robustly. To examine this issue, subjects performed a two-alternative forced choice paradigm with a variable-interval payoff schedule to dynamically manipulate the relative value of two stimuli defined by their orientation (one was rotated clockwise from vertical, the other counterclockwise). Activation levels in visual cortex were monitored using functional MRI and feature-selective voxel tuning functions while subjects performed the behavioral task. The results suggest that value not only modulates the relative amplitude of responses in early areas of human visual cortex, but also sharpens the response profile across the populations of feature-selective neurons that encode the critical stimulus feature (orientation). Moreover, changes in space- or feature-based attention cannot easily explain the results because representations of both the selected and the unselected stimuli underwent a similar feature-selective modulation. This sharpening in the population response profile could theoretically improve the probability of correctly discriminating high-value stimuli from low-value alternatives.

Orientation Coding by Population of Neurons in Rats' Primary Visual Cortex

2013 ◽  
Vol 427-429 ◽  
pp. 2089-2093
Author(s):  
Li Shi ◽  
Qi Ming Ye ◽  
Xiao Ke Niu
Keyword(s):  
Visual Cortex ◽  
Single Channel ◽  
Lasso Regression ◽  
Electrode Arrays ◽  
Population Response ◽  
Effective Response ◽  
Specific Stimulus ◽  
Channel Response ◽  
Stimulus Response ◽  
Single Feature

Research on Primate visual cortex (V1 area) neurons orientation coding mechanism is the base of revealing the whole visual cortex information processing mechanism. Firstly, this paper adopted different orientation grating to stimulate visually on rats. Meanwhile, gather response signals of population neurons from V1 area using multi-electrode arrays. Then, screen effective response channels according to the orientation selection of different neurons in different channels. Besides, extract Spike average fire rate and LFPγ band power feature in every effective channel signals within specific stimulus response time to construct population response joint features. Finally, taking Lasso regression model as coding model, use joint features to differentiate grating orientation, in order to research on V1 areas population neurons orientation coding. The consequences indicate that the results of population response joint features coding for six different orientation are superior to the results of any single feature of population response coding, and remarkably better than the results of single channel response feature coding.

scholarly journals Distortions in perceived direction of motion predicted by population response dynamics in primary visual cortex

2010 ◽  
Vol 8 (17) ◽  
pp. 33-33
Author(s):  
W. Wu ◽  
P. H. Tiesinga ◽  
T. R. Tucker ◽  
S. R. Mitroff ◽  
D. Fitzpatrick
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Response Dynamics ◽  
Population Response
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