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The role of contrast sensitivity in global motion processing deficits in the elderly

Allen, Harriet A.; Hutchinson, Claire V.; Ledgeway, Tim; Gayle, Precius

Authors

Harriet A. Allen H.A.Allen@nottingham.ac.uk

Claire V. Hutchinson

Tim Ledgeway

Precius Gayle

Abstract

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.

Journal Article Type Article
Publication Date Aug 17, 2010
Journal Journal of Vision
Electronic ISSN 1534-7362
Publisher Association for Research in Vision and Ophthalmology
Peer Reviewed Peer Reviewed
Volume 10
Issue 10
Article Number 15
Institution Citation Allen, H. A., Hutchinson, C. V., Ledgeway, T., & Gayle, P. (2010). The role of contrast sensitivity in global motion processing deficits in the elderly. Journal of Vision, 10(10), doi:10.1167/10.10.15
DOI https://doi.org/10.1167/10.10.15
Keywords age, motion, contrast sensitivity, optic flow, self-motion, random dot kinematogram
Publisher URL http://jov.arvojournals.org/article.aspx?articleid=2121088
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf




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