Surface Occlusion Perception Task
Objective: Measure correlation between V1 neural responses and perceptual surface perception using texture displays with surface occlusion examples
Protocol Steps
Prepare texture display stimuli
Create texture displays where the texture covering the receptive field remains constant across all trials, but the perceptual context varies based on the configuration of extra-RF texture elements
Note: Displays should include variations in disparity, color, luminance, and orientation cues to define textured figures centered on the RF of V1 neurons
View evidence from paper
“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 texture displays with varying contextual cues
Present texture displays to awake, behaving macaque monkeys where contextual modulation is studied using disparity, color, luminance, and orientation cues that variously define a textured figure centered on the RF
Note: Contextual modulation has a spatial extent of approximately 8 to 10 degrees diameter parafoveally
View evidence from paper
“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 binocularly rivalrous texture displays
Present binocularly rivalrous texture displays to measure contextual modulation correlation with perceptual experience
View evidence from paper
“Contextual modulation correlated with perceptual experience of both binocularly rivalrous texture displays and of displays with a simple example of surface occlusion”
Present surface occlusion displays
Present displays with simple examples of surface occlusion to measure correlation between V1 neural responses and perceptual surface perception
View evidence from paper
“Contextual modulation correlated with perceptual experience of both binocularly rivalrous texture displays and of displays with a simple example of surface occlusion”
Record single-unit neural activity
Record neural responses from V1 neurons during stimulus presentation in awake, behaving macaque monkeys
Note: Contextual modulation in V1 has a characteristic latency of 80-100 msec after stimulus onset
View evidence from paper
“We found contextual modulation in V1 to have a characteristic latency of 80–100 msec after stimulus onset”