The role of contrast sensitivity in global motion processing deficits in the elderly
This study compared the effects of age on the perception of translational, radial, and rotational global motion patterns. Motion coherence thresholds were measured for judging the direction of each motion type as a function of contrast (visibility) and temporal sampling rate in young and elderly par...
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| Format: | Article |
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Association for Research in Vision and Ophthalmology
2010
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| Online Access: | https://eprints.nottingham.ac.uk/43625/ |
| _version_ | 1848796731825717248 |
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| author | Allen, Harriet A. Hutchinson, Claire V. Ledgeway, Tim Gayle, Precius |
| author_facet | Allen, Harriet A. Hutchinson, Claire V. Ledgeway, Tim Gayle, Precius |
| author_sort | Allen, Harriet A. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | This study compared the effects of age on the perception of translational, radial, and rotational global motion patterns. Motion coherence thresholds were measured for judging the direction of each motion type as a function of contrast (visibility) and temporal sampling rate in young and elderly participants. Coherence thresholds decreased as dot contrast increased asymptoting at high dot contrasts but were higher in elderly compared to young participants. This equated to global motion impairment in the elderly of a factor of around 2, characterized by a shift of the threshold vs. contrast function along the horizontal axes (dot contrast). The effect of contrast interacted with the temporal sampling rate. Old participants were deleteriously affected by reduced temporal sampling particularly at low contrasts. The findings suggest that age- related changes in global motion perception may be driven principally by deficits in contrast encoding, rather than by deficits in motion integration and suggest a role for increased internal noise in the older visual system. |
| first_indexed | 2025-11-14T19:52:39Z |
| format | Article |
| id | nottingham-43625 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:52:39Z |
| publishDate | 2010 |
| publisher | Association for Research in Vision and Ophthalmology |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-436252020-05-04T16:29:39Z https://eprints.nottingham.ac.uk/43625/ The role of contrast sensitivity in global motion processing deficits in the elderly Allen, Harriet A. Hutchinson, Claire V. Ledgeway, Tim Gayle, Precius This study compared the effects of age on the perception of translational, radial, and rotational global motion patterns. Motion coherence thresholds were measured for judging the direction of each motion type as a function of contrast (visibility) and temporal sampling rate in young and elderly participants. Coherence thresholds decreased as dot contrast increased asymptoting at high dot contrasts but were higher in elderly compared to young participants. This equated to global motion impairment in the elderly of a factor of around 2, characterized by a shift of the threshold vs. contrast function along the horizontal axes (dot contrast). The effect of contrast interacted with the temporal sampling rate. Old participants were deleteriously affected by reduced temporal sampling particularly at low contrasts. The findings suggest that age- related changes in global motion perception may be driven principally by deficits in contrast encoding, rather than by deficits in motion integration and suggest a role for increased internal noise in the older visual system. Association for Research in Vision and Ophthalmology 2010-08-17 Article PeerReviewed Allen, Harriet A., Hutchinson, Claire V., Ledgeway, Tim and Gayle, Precius (2010) The role of contrast sensitivity in global motion processing deficits in the elderly. Journal of Vision, 10 (10). 15/1-15/10. ISSN 1534-7362 age motion contrast sensitivity optic flow self-motion random dot kinematogram http://jov.arvojournals.org/article.aspx?articleid=2121088 doi:10.1167/10.10.15 doi:10.1167/10.10.15 |
| spellingShingle | age motion contrast sensitivity optic flow self-motion random dot kinematogram Allen, Harriet A. Hutchinson, Claire V. Ledgeway, Tim Gayle, Precius The role of contrast sensitivity in global motion processing deficits in the elderly |
| title | The role of contrast sensitivity in global motion processing deficits in the elderly |
| title_full | The role of contrast sensitivity in global motion processing deficits in the elderly |
| title_fullStr | The role of contrast sensitivity in global motion processing deficits in the elderly |
| title_full_unstemmed | The role of contrast sensitivity in global motion processing deficits in the elderly |
| title_short | The role of contrast sensitivity in global motion processing deficits in the elderly |
| title_sort | role of contrast sensitivity in global motion processing deficits in the elderly |
| topic | age motion contrast sensitivity optic flow self-motion random dot kinematogram |
| url | https://eprints.nottingham.ac.uk/43625/ https://eprints.nottingham.ac.uk/43625/ https://eprints.nottingham.ac.uk/43625/ |