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• W2559982503 abstract "The motion of a 1D image feature, such as a line, seen through a small aperture, or the small receptive field of a neural motion sensor, is underconstrained, and it is not possible to derive the true motion direction from a single local measurement. This is referred to as the aperture problem. How the visual system solves the aperture problem is a fundamental question in visual motion research. In the estimation of motion vectors through integration of ambiguous local motion measurements at different positions, conventional theories assume that the object motion is a rigid translation, with motion signals sharing a common motion vector within the spatial region over which the aperture problem is solved. However, this strategy fails for global rotation. Here we show that the human visual system can estimate global rotation directly through spatial pooling of locally ambiguous measurements, without an intervening step that computes local motion vectors. We designed a novel ambiguous global flow stimulus, which is globally as well as locally ambiguous. The global ambiguity implies that the stimulus is simultaneously consistent with both a global rigid translation and an infinite number of global rigid rotations. By the standard view, the motion should always be seen as a global translation, but it appears to shift from translation to rotation as observers shift fixation. This finding indicates that the visual system can estimate local vectors using a global rotation constraint, and suggests that local motion ambiguity may not be resolved until consistencies with multiple global motion patterns are assessed." @default.
• W2559982503 created "2016-12-16" @default.
• W2559982503 creator A5045043615 @default.
• W2559982503 creator A5078752522 @default.
• W2559982503 creator A5084307082 @default.
• W2559982503 date "2016-12-09" @default.
• W2559982503 modified "2023-10-16" @default.
• W2559982503 title "Multiple-stage ambiguity in motion perception reveals global computation of local motion directions" @default.
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• W2559982503 doi "https://doi.org/10.1167/16.15.7" @default.
• W2559982503 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27936271" @default.
• W2559982503 hasPublicationYear "2016" @default.
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