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• W2524392013 abstract "The perception of visual motion can be profoundly influenced by visual context. To gain insight into how the visual system represents motion speed, we investigated how a background stimulus that did not move in a net direction influenced the perceived speed of a center stimulus. Visual stimuli were two overlapping random-dot patterns. The center stimulus moved coherently in a fixed direction, whereas the background stimulus moved randomly. We found that human subjects perceived the speed of the center stimulus to be significantly faster than its veridical speed when the background contained motion noise. Interestingly, the perceived speed was tuned to the noise level of the background. When the speed of the center stimulus was low, the highest perceived speed was reached when the background had a low level of motion noise. As the center speed increased, the peak perceived speed was reached at a progressively higher background noise level. The effect of speed overestimation required the center stimulus to overlap with the background. Increasing the background size within a certain range enhanced the effect, suggesting spatial integration. The speed overestimation was significantly reduced or abolished when the center stimulus and the background stimulus had different colors, or when they were placed at different depths. When the center- and background-stimuli were perceptually separable, speed overestimation was correlated with perceptual similarity between the center- and background-stimuli. These results suggest that integration of motion energy from random motion noise has a significant impact on speed perception. Our findings put new constraints on models regarding the neural basis of speed perception." @default.
• W2524392013 created "2016-10-07" @default.
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• W2524392013 date "2016-12-01" @default.
• W2524392013 modified "2023-09-22" @default.
• W2524392013 title "Integration of motion energy from overlapping random background noise increases perceived speed of coherently moving stimuli" @default.
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• W2524392013 doi "https://doi.org/10.1152/jn.01068.2015" @default.
• W2524392013 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5141260" @default.
• W2524392013 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27683893" @default.
• W2524392013 hasPublicationYear "2016" @default.
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