Computation of mean size is based on perceived size

Hee Yeon Im, Sang Chul Chong

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


The present study investigated whether computation of mean object size was based on perceived or physical size. The Ebbinghaus illusion was used to make the perceived size of a circle different from its physical size. Four Ebbinghaus configurations were presented either simultaneously (Experiment 1) or sequentially (Experiment 2) to each visual field, and participants were instructed to attend only to the central circles of each configuration. Participants' judgments of mean central circle size were influenced by the Ebbinghaus illusion. In addition, the Ebbinghaus illusion influenced the coding of individual size rather than the averaging. These results suggest that perceived rather than physical size was used in computing the mean size.

Original languageEnglish
Pages (from-to)375-384
Number of pages10
JournalAttention, Perception, and Psychophysics
Issue number2
Publication statusPublished - 2009 Feb

Bibliographical note

Funding Information:
This work was supported by Korea Research Foundation Grant KRF-2006-332-H00039, funded by the Korean Government (MOEHRD).

All Science Journal Classification (ASJC) codes

  • Language and Linguistics
  • Experimental and Cognitive Psychology
  • Sensory Systems
  • Linguistics and Language


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