The effects of dot density and motion coherence on perceptual fading of a target in noise

A. E. Welchman*, J. M. Harris

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A peripherally presented target embedded in dynamic texture perceptually disappears (or 'fills-in') after around 10 s of steady fixation. This phenomenon was investigated for a target containing moving dots. The effects of manipulating the coherence of the motion within the target and the density of dots across the whole screen were explored. Coherence thresholds for the detection of a target at different dot densities were recorded for comparison. Fading occurred faster as either motion coherence or dot density was reduced. Coherence thresholds for target detection were unaffected by manipulations of dot density. There appeared to be no relationship between the stimulus exposure time needed for fading and the coherence threshold for detection of a target. The results suggest that the time taken for a target to fade is not a simple function of its motion detection threshold.

Original languageEnglish
Pages (from-to)45-58
Number of pages14
JournalSpatial Vision
Issue number1
Publication statusPublished - 1 Jan 2001


  • Adaptation
  • Coherence
  • Density
  • Filling-in
  • Motion

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