Age, eye movement and motion discrimination

O'Connor, Emer, Margrain, Thomas Hengist ORCID: https://orcid.org/0000-0003-1280-0809 and Freeman, Tom C. A. ORCID: https://orcid.org/0000-0002-5989-9183 2010. Age, eye movement and motion discrimination. Vision Research 50 (23) , pp. 2588-2599. 10.1016/j.visres.2010.08.015

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Abstract

Age is known to affect sensitivity to retinal motion. However, little is known about how age might affect sensitivity to motion during pursuit. We therefore investigated direction discrimination and speed discrimination when moving stimuli were either fixated or pursued. Our experiments showed: (1) age influences direction discrimination at slow speeds but has little affect on speed discrimination; (2) the faster eye movements made in the pursuit conditions produced poorer direction discrimination at slower speeds, and poorer speed discrimination at all speeds; (3) regardless of eye-movement condition, observers always combined retinal and extra-retinal motion signals to make their judgements. Our results support the idea that performance in these tasks is limited by the internal noise associated with retinal and extra-retinal motion signals, both of which feed into a stage responsible for estimating head-centred motion. Imprecise eye movement, or later noise introduced at the combination stage, could not explain the results

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Optometry and Vision Sciences Psychology
Subjects:	R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry R Medicine > RE Ophthalmology
Uncontrolled Keywords:	Motion ; Discrimination ; Smooth pursuit eye movement ; Extra-retinal signals
Publisher:	Elsevier
ISSN:	0042-6989
Last Modified:	03 Oct 2024 14:14
URI:	https://orca.cardiff.ac.uk/id/eprint/11523

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