Statistical processing: Computing the average size in perceptual groups

Sang Chul Chong, Anne Treisman

Research output: Contribution to journalArticle

194 Citations (Scopus)


This paper explores some structural constraints on computing the mean sizes of sets of elements. Neither number nor density had much effect on judgments of mean size. Intermingled sets of circles segregated only by color gave mean discrimination thresholds for size that were as accurate as sets segregated by location. They were about the same when the relevant color was cued, when it was not cued, and when no distractor set was present. The results suggest that means are computed automatically and in parallel after an initial preattentive segregation by color.

Original languageEnglish
Pages (from-to)891-900
Number of pages10
JournalVision Research
Issue number7
Publication statusPublished - 2005 Mar 1


All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems

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