Motion noise changes directional interaction between transparently moving stimuli from repulsion to attraction

To interpret visual scenes, visual systems need to segment or integrate multiple moving features into distinct objects or surfaces. Previous studies have found that the perceived direction separation between two transparently moving random-dot stimuli is wider than the actual direction separation. T...

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Published in:PloS one 2012-11, Vol.7 (11), p.e48649-e48649
Main Authors: Gaudio, Jennifer L, Huang, Xin
Format: Article
Language:English
Subjects:
Attraction
Biology
Constraint modelling
Human motion
Humans
Motion
Motion capture
Motion detection
Motion Perception - physiology
Neurosciences
Noise
Perceptions
Photic Stimulation
Segmentation
Separation
Social and Behavioral Sciences
Time Factors
Transparency
Visual stimuli
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Huang, Xin
description To interpret visual scenes, visual systems need to segment or integrate multiple moving features into distinct objects or surfaces. Previous studies have found that the perceived direction separation between two transparently moving random-dot stimuli is wider than the actual direction separation. This perceptual "direction repulsion" is useful for segmenting overlapping motion vectors. Here we investigate the effects of motion noise on the directional interaction between overlapping moving stimuli. Human subjects viewed two overlapping random-dot patches moving in different directions and judged the direction separation between the two motion vectors. We found that the perceived direction separation progressively changed from wide to narrow as the level of motion noise in the stimuli was increased, showing a switch from direction repulsion to attraction (i.e. smaller than the veridical direction separation). We also found that direction attraction occurred at a wider range of direction separations than direction repulsion. The normalized effects of both direction repulsion and attraction were the strongest near the direction separation of ∼25° and declined as the direction separation further increased. These results support the idea that motion noise prompts motion integration to overcome stimulus ambiguity. Our findings provide new constraints on neural models of motion transparency and segmentation.
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source Publicly Available Content Database; PubMed Central
subjects Attraction
Biology
Constraint modelling
Human motion
Humans
Motion
Motion capture
Motion detection
Motion Perception - physiology
Neurosciences
Noise
Perceptions
Photic Stimulation
Segmentation
Separation
Social and Behavioral Sciences
Time Factors
Transparency
Visual stimuli
title Motion noise changes directional interaction between transparently moving stimuli from repulsion to attraction
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