Criterion-free measurement of motion transparency perception at different speeds
Transparency perception often occurs when objects within the visual scene partially occlude each other or move at the same time, at different velocities across the same spatial region. Although transparent motion perception has been extensively studied, we still do not understand how the distributio...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Association for Research in Vision and Ophthalmology
2018
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| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/51125/ |
| _version_ | 1848798422573776896 |
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| author | Rocchi, Francesca Ledgeway, Timothy Webb, Ben S. |
| author_facet | Rocchi, Francesca Ledgeway, Timothy Webb, Ben S. |
| author_sort | Rocchi, Francesca |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Transparency perception often occurs when objects within the visual scene partially occlude each other or move at the same time, at different velocities across the same spatial region. Although transparent motion perception has been extensively studied, we still do not understand how the distribution of velocities within a visual scene contribute to transparent perception. Here we use a novel psychophysical procedure to characterize the distribution of velocities in a scene that give rise to transparent motion perception. To prevent participants from adopting a subjective decision criterion when discriminating transparent motion, we used an ‘‘oddone-out,’’ three alternative forced-choice procedure. Two intervals contained the standard—a random-dotkinematogram with dot speeds or directions sampled from a uniform distribution. The other interval contained the comparison—speeds or directions sampled from a distribution with the same range as the standard, but with a notch of different widths removed. Our results suggest that transparent motion perception is driven primarily by relatively slow speeds, and does not emerge when only very fast speeds are present within a visual scene. Transparent perception of moving surfaces is modulated by stimulus-based characteristics, such as the separation between the means of the overlapping distributions or the range of speeds presented within an image. Our work illustrates the utility of using objective, forced-choice methods to reveal the mechanisms underlying motion transparency perception. |
| first_indexed | 2025-11-14T20:19:31Z |
| format | Article |
| id | nottingham-51125 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T20:19:31Z |
| publishDate | 2018 |
| publisher | Association for Research in Vision and Ophthalmology |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-511252020-05-08T09:15:29Z https://eprints.nottingham.ac.uk/51125/ Criterion-free measurement of motion transparency perception at different speeds Rocchi, Francesca Ledgeway, Timothy Webb, Ben S. Transparency perception often occurs when objects within the visual scene partially occlude each other or move at the same time, at different velocities across the same spatial region. Although transparent motion perception has been extensively studied, we still do not understand how the distribution of velocities within a visual scene contribute to transparent perception. Here we use a novel psychophysical procedure to characterize the distribution of velocities in a scene that give rise to transparent motion perception. To prevent participants from adopting a subjective decision criterion when discriminating transparent motion, we used an ‘‘oddone-out,’’ three alternative forced-choice procedure. Two intervals contained the standard—a random-dotkinematogram with dot speeds or directions sampled from a uniform distribution. The other interval contained the comparison—speeds or directions sampled from a distribution with the same range as the standard, but with a notch of different widths removed. Our results suggest that transparent motion perception is driven primarily by relatively slow speeds, and does not emerge when only very fast speeds are present within a visual scene. Transparent perception of moving surfaces is modulated by stimulus-based characteristics, such as the separation between the means of the overlapping distributions or the range of speeds presented within an image. Our work illustrates the utility of using objective, forced-choice methods to reveal the mechanisms underlying motion transparency perception. Association for Research in Vision and Ophthalmology 2018-04-03 Article PeerReviewed application/pdf en cc_by https://eprints.nottingham.ac.uk/51125/1/i1534-7362-18-4-5.pdf Rocchi, Francesca, Ledgeway, Timothy and Webb, Ben S. (2018) Criterion-free measurement of motion transparency perception at different speeds. Journal of Vision, 18 (4). 5/1-5/12. ISSN 1534-7362 motion transparency odd-one-out segmentation global motion speed perception http://jov.arvojournals.org/article.aspx?articleid=2677960 doi:10.1167/18.4.5 doi:10.1167/18.4.5 |
| spellingShingle | motion transparency odd-one-out segmentation global motion speed perception Rocchi, Francesca Ledgeway, Timothy Webb, Ben S. Criterion-free measurement of motion transparency perception at different speeds |
| title | Criterion-free measurement of motion transparency perception at different speeds |
| title_full | Criterion-free measurement of motion transparency perception at different speeds |
| title_fullStr | Criterion-free measurement of motion transparency perception at different speeds |
| title_full_unstemmed | Criterion-free measurement of motion transparency perception at different speeds |
| title_short | Criterion-free measurement of motion transparency perception at different speeds |
| title_sort | criterion-free measurement of motion transparency perception at different speeds |
| topic | motion transparency odd-one-out segmentation global motion speed perception |
| url | https://eprints.nottingham.ac.uk/51125/ https://eprints.nottingham.ac.uk/51125/ https://eprints.nottingham.ac.uk/51125/ |