A comparison of five methods of illusion measurement

Stanley Coren, Joan S. Girgus

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


The relative efficiency of five techniques of illusion measurement were tested on parametric variations of the Mueller-Lyer and Ebbinghaus figures. The methods of average error, reproduction, and selection from a graded series all showed significant effects of configurational variations. The subjective scaling techniques each failed to measure adequately changes in illusion magnitude for one illusion configuration. The suitability of the tested measures for group administration is also discussed.

Original languageEnglish (US)
Pages (from-to)240-244
Number of pages5
JournalBehavior Research Methods & Instrumentation
Issue number5
StatePublished - Sep 1972

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)
  • Psychology (miscellaneous)
  • General Psychology


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