Statistical processing: Computing the average size in perceptual groups

Sang Chul Chong, Anne Treisman

Research output: Contribution to journalArticlepeer-review

252 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

Bibliographical note

Funding Information:
This research was supported by NIH grant number 1 RO1 MH58383, by Israeli Binational Science Foundation grant # 1000274, and by Conte Center Grant, number MH062196.

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems


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