The optimum decision rules in the same-different paradigm

Huanping Dai, Niek J. Versfeld, David M. Green

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


In this paper we derive the optimum (likelihood-ratio) decision statistic for a same-different paradigm. The likelihood ratio is dependent on the degree of correlation between the two observations on each trial. For the two extreme cases in which the observations are either independent or highly correlated, the optimum decision rule is identical to each of two previously suggested decision rules. For these two cases, the receiver-operating characteristic (ROC) curves are calculated. Finally, an experimental procedure is suggested for assessing the decision rule actually used by the observer in a same-different task.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalPerception and Psychophysics
Issue number1
StatePublished - Jan 1996

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • General Psychology
  • Sensory Systems


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