Reduced sampling efficiency causes degraded Vernier hyperacuity with normal aging: Vernier acuity in position noise
Li, Roger W. , Brown, Brian, Edwards, Marion H. , Ngo, Charlie V. , Chat, Sandy W. , & Levi, Dennis M. (2012) Reduced sampling efficiency causes degraded Vernier hyperacuity with normal aging: Vernier acuity in position noise. Scientific Reports, 2.
Vernier acuity, a form of visual hyperacuity, is amongst the most precise forms of spatial vision. Under optimal conditions Vernier thresholds are much finer than the inter-photoreceptor distance. Achievement of such high precision is based substantially on cortical computations, most likely in the primary visual cortex. Using stimuli with added positional noise, we show that Vernier processing is reduced with advancing age across a wide range of noise levels. Using an ideal observer model, we are able to characterize the mechanisms underlying age-related loss, and show that the reduction in Vernier acuity can be mainly attributed to the reduction in efficiency of sampling, with no significant change in the level of internal position noise, or spatial distortion, in the visual system.
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|Item Type:||Journal Article|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright © 2012, Macmillan Publishers Limited.|
|Copyright Statement:||This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/|
|Deposited On:||12 Apr 2012 15:43|
|Last Modified:||12 Apr 2012 15:43|
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