Psychological Research

, Volume 45, Issue 1, pp 11–18 | Cite as

Short- and long-range processes in visual apparent movement

  • Axel Larsen
  • Joyce E. Farrell
  • Claus Bundesen


The minimum stimulus-onset asynchrony required for perception of beta apparent movement was measured with point stimuli separated by visual angles ranging from about 0.1· to 5· and viewing distance as a parameter. For each viewing distance, the threshold for beta movement was a monotonic function of the visual angle with a strong linear increase over angles less than 0.25· (short-range function) and a much weaker linear increase over angles greater than 1.5· (long-range). The short- and long-range functions were differentially affected by increase in viewing distance: the long-range function increased in slope, but the extrapolated zero-intercept was constant; the short-range function changed in intercept, but not in slope. The results provide strong evidence for separate short- and long-range processes in visual motion perception.


Strong Evidence Visual Angle Linear Increase Monotonic Function Apparent Movement 
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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • Axel Larsen
    • 1
  • Joyce E. Farrell
    • 2
  • Claus Bundesen
    • 3
  1. 1.Institute of Clinical PsychologyCopenhagen UniversityCopenhagen S.Denmark
  2. 2.Department of PsychologyNew York UniversityNew YorkUSA
  3. 3.Psychological LaboratoryCopenhagen UniversityCopenhagenDenmark

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