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Open AccessArticle

The Effect of Stimulus Area on Global Motion Thresholds in Children and Adults

Department of Psychology, University of Washington, Guthrie Hall Box 351525, Seattle, WA 98105, USA
Department of Ophthalmology and Visual Sciences, University of British Columbia, Rm E300E, 4480 Oak Street, Vancouver, BC V6H 3V4, Canada
Author to whom correspondence should be addressed.
Vision 2019, 3(1), 10;
Received: 11 January 2019 / Revised: 27 February 2019 / Accepted: 8 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Visual Motion Processing)
Performance on random-dot global motion tasks may reach adult-like levels before 4 or as late as 16 years of age, depending on the specific parameters used to create the stimuli. Later maturation has been found for slower speeds, smaller spatial displacements, and sparser dot arrays. This protracted development on global motion tasks may depend on limitations specific to spatial aspects of a motion stimulus rather than to motion mechanisms per se. The current study investigated the impact of varying stimulus area (9, 36, and 81 deg2) on the global motion coherence thresholds of children 4–6 years old and adults for three signal dot displacements (∆x = 1, 5, and 30 arcmin). We aimed to determine whether children could achieve mature performance for the smallest displacements, a condition previously found to show late maturation, when a larger stimulus area was used. Coherence thresholds were higher in children compared to adults in the 1 and 5 arcmin displacement conditions, as reported previously, and this did not change as a function of stimulus area. However, both children and adults performed better with a larger stimulus area in the 30 arcmin displacement condition only. This suggests that immature spatial integration, as measured by stimulus area, cannot account for immaturities in global motion perception. View Full-Text
Keywords: visual development; global motion; motion perception; speed visual development; global motion; motion perception; speed
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Meier, K.; Giaschi, D. The Effect of Stimulus Area on Global Motion Thresholds in Children and Adults. Vision 2019, 3, 10.

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