Keywords
self-operated stimuli, pattern motion, perceptual learning, V1-MT model, motion integration
Abstract
Movement can affect the way we make sense of complex visual information. To investigate this issue, we designed an experiment to assess changes of plaid motion perception threshold after a period of sensorimotor contingency experience. We found that movement training facilitates combination of elementary motion cues into a global motion percept. No changes in perceptual thresholds are observed in a passive visual condition. A Bayesian model suggested a reduction, after training, of the cross-talk between two gratings with unbalanced contrasts in corresponding sensory channels. To test plausible neural mechanisms for active reduction of cross-talk in cortical representation of complex visual motion, we exploited an hierarchical model based on a population of energy motion detectors. Perceptual threshold reduction is consistent with an early neural instantiation of perceptual learning processes, which might occur by rearranging divisive contrast normalization pool in the coding stage of component motion directions.
Start Date
16-5-2024 2:00 PM
End Date
16-5-2024 3:00 PM
Included in
Facilitation in Pattern Motion Perception of Self-operated Stimuli Explained by Adaptive Contrast Normalization
Movement can affect the way we make sense of complex visual information. To investigate this issue, we designed an experiment to assess changes of plaid motion perception threshold after a period of sensorimotor contingency experience. We found that movement training facilitates combination of elementary motion cues into a global motion percept. No changes in perceptual thresholds are observed in a passive visual condition. A Bayesian model suggested a reduction, after training, of the cross-talk between two gratings with unbalanced contrasts in corresponding sensory channels. To test plausible neural mechanisms for active reduction of cross-talk in cortical representation of complex visual motion, we exploited an hierarchical model based on a population of energy motion detectors. Perceptual threshold reduction is consistent with an early neural instantiation of perceptual learning processes, which might occur by rearranging divisive contrast normalization pool in the coding stage of component motion directions.