Motion coherence and direction discrimination in healthy aging

Karin S. Pilz (Lead / Corresponding author), Louisa Miller, Hannah C. Agnew

Research output: Contribution to journalArticle

13 Citations (Scopus)
216 Downloads (Pure)

Abstract

Perceptual functions change with age, particularly motion perception. With regard to healthy aging, previous studies mostly measured motion coherence thresholds for coarse motion direction discrimination along cardinal axes of motion. Here, we investigated age-related changes in the ability to discriminate between small angular differences in motion directions, which allows for a more specific assessment of age-related decline and its underlying mechanisms. We first assessed older (>60 years) and younger (<30 years) participants' ability to discriminate coarse horizontal (left/right) and vertical (up/down) motion at 100% coherence and a stimulus duration of 400 ms. In a second step, we determined participants' motion coherence thresholds for vertical and horizontal coarse motion direction discrimination. In a third step, we used the individually determined motion coherence thresholds and tested fine motion direction discrimination for motion clockwise away from horizontal and vertical motion. Older adults performed as well as younger adults for discriminating motion away from vertical. Surprisingly, performance for discriminating motion away from horizontal was strongly decreased. Further analyses, however, showed a relationship between motion coherence thresholds for horizontal coarse motion direction discrimination and fine motion direction discrimination performance in older adults. In a control experiment, using motion coherence above threshold for all conditions, the difference in performance for horizontal and vertical fine motion direction discrimination for older adults disappeared. These results clearly contradict the notion of an overall age-related decline in motion perception, and, most importantly, highlight the importance of taking into account individual differences when assessing age-related changes in perceptual functions.

Original languageEnglish
Article number31
Pages (from-to)1-12
Number of pages12
JournalJournal of Vision
Volume17
Issue number1
Early online date17 Jan 2017
DOIs
Publication statusPublished - Jan 2017

Keywords

  • Motion perception
  • Healthy aging
  • Visual perception
  • Direction discrimination
  • Motion coherence

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