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Spatiotemporal properties of apparent motion perception and aging

Roudaia, E., Bennett, P. J., Sekuler, A. B. & Pilz, K. S., 2010, In : JOURNAL OF VISION. 10, 14, 15 p., 5.

Research output: Contribution to journalArticleAcademicpeer-review

We used a random-dot two-frame apparent motion paradigm to investigate whether age-related declines in motion perception are caused by deficits in integrating spatial information, temporal information, or both. Two random-dot patterns were presented sequentially on a black screen, separated by a blank inter-stimulus interval ranging from 0.01 s to 0.240 s. From the first to the second pattern, all the dots were shifted to the left or right by an equal displacement ranging from 0.03 deg to 1.64 deg. The spatiotemporal range yielding good direction discrimination performance was greatly reduced with age. For ISIs longer than 0.04 s, older subjects performed less accurately than younger subjects across a wide range of spatial displacements. Older subjects also showed poorer performance for large spatial displacements across a wide range of ISIs. Age-related differences in performance were also found with small displacements; however, these were largely accounted for by age-related declines in visual acuity. Overall, the results show that the maximum temporal interval and maximum spatial displacement over which two frames can be integrated are reduced in older age.

Original languageEnglish
Article number5
Number of pages15
JournalJOURNAL OF VISION
Volume10
Issue number14
Publication statusPublished - 2010
Externally publishedYes

    Keywords

  • motion-2D, apparent motion, aging, spatial integration, temporal integration, RANDOM-DOT CINEMATOGRAMS, AGE-RELATED DIFFERENCES, VISUAL CORTICAL-CELLS, CRITICAL FLICKER FREQUENCY, SENESCENT RHESUS-MONKEYS, SHORT-RANGE PROCESS, CAT STRIATE CORTEX, DISPLACEMENT LIMITS, SPATIAL-FREQUENCY, OPTIC FLOW

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