Source Paper
Contextual Modulation in Primary Visual Cortex
Karl Zipser, Victor A. F. Lamme, Peter H. Schiller
Journal of Neuroscience • 1996
Source Paper
Karl Zipser, Victor A. F. Lamme, Peter H. Schiller
Journal of Neuroscience • 1996
We studied extra-receptive field contextual modulation in area V1 of awake, behaving macaque monkeys. Contextual modulation was studied using texture displays in which texture covering the receptive field (RF) was the same in all trials, but the perceptual context of this texture could vary depending on the configuration of extra-RF texture elements. We found robust contextual modulation when disparity, color, luminance, and orientation cues variously defined a textured figure centered on the RF of V1 neurons. We found contextual modulation to have a spatial extent of ∼8 to 10° diameter parafoveally. Contextual modulation correlated with perceptual experience of both binocularly rivalrous texture displays and of displays with a simple example of surface occlusion. We found contextual modulation in V1 to have a characteristic latency of 80–100 msec after stimulus onset, potentially allowing feedback from extrastriate areas to underlie to this effect.
Objective: To study extra-receptive field contextual modulation in area V1 of awake, behaving macaque monkeys using texture displays with varying perceptual context (disparity, color, luminance, orientation cues) to determine spatial extent and latency of contextual modulation
Create texture displays where the texture covering the receptive field remains constant across all trials, but the perceptual context of this texture varies depending on the configuration of extra-RF texture elements
Note: Texture displays must be designed to test contextual modulation using disparity, color, luminance, and orientation cues
“texture displays in which texture covering the receptive field (RF) was the same in all trials, but the perceptual context of this texture could vary depending on the configuration of extra-RF texture elements”
Present textured figure displays where disparity cues define a textured figure centered on the receptive field of V1 neurons
Note: Disparity is one of the contextual cues tested for modulation effects
“We found robust contextual modulation when disparity, color, luminance, and orientation cues variously defined a textured figure centered on the RF of V1 neurons”
Present textured figure displays where color cues define a textured figure centered on the receptive field of V1 neurons
Note: Color is one of the contextual cues tested for modulation effects
“We found robust contextual modulation when disparity, color, luminance, and orientation cues variously defined a textured figure centered on the RF of V1 neurons”
Present textured figure displays where luminance cues define a textured figure centered on the receptive field of V1 neurons
Note: Luminance is one of the contextual cues tested for modulation effects
“We found robust contextual modulation when disparity, color, luminance, and orientation cues variously defined a textured figure centered on the RF of V1 neurons”
Present textured figure displays where orientation cues define a textured figure centered on the receptive field of V1 neurons
Note: Orientation is one of the contextual cues tested for modulation effects
“We found robust contextual modulation when disparity, color, luminance, and orientation cues variously defined a textured figure centered on the RF of V1 neurons”
Record neural activity from individual V1 neurons during presentation of texture displays with varying contextual cues
Note: Recordings conducted in awake, behaving animals
“We studied extra-receptive field contextual modulation in area V1 of awake, behaving macaque monkeys”
Present texture displays designed to produce binocular rivalry to test correlation between contextual modulation and perceptual experience
Note: Used to correlate neural modulation with perceptual experience
“Contextual modulation correlated with perceptual experience of both binocularly rivalrous texture displays and of displays with a simple example of surface occlusion”
Present texture displays with simple examples of surface occlusion to test correlation between contextual modulation and perceptual experience
Note: Used to correlate neural modulation with perceptual experience
“Contextual modulation correlated with perceptual experience of both binocularly rivalrous texture displays and of displays with a simple example of surface occlusion”
Determine the spatial extent of contextual modulation by varying the distance of extra-RF texture elements from the receptive field
Note: Spatial extent measured in degrees of visual angle parafoveally
“We found contextual modulation to have a spatial extent of ≈8 to 10° diameter parafoveally”
Determine the characteristic latency of contextual modulation by measuring the time from stimulus onset to the appearance of modulation effects in neural responses
Note: Latency measurement allows inference about potential feedback mechanisms from extrastriate areas
“We found contextual modulation in V1 to have a characteristic latency of 80–100 msec after stimulus onset, potentially allowing feedback from extrastriate areas to underlie to this effect”
awake, behaving animals; recordings from area V1 neurons