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PSYCHOMETRIKA--VOL.58, NO.2, 257-279 THE RELATIVE SENSITIVITIES OF SAME-DIFFERENT AND
 

Summary: PSYCHOMETRIKA--VOL.58, NO.2, 257-279
JUNE1993
THE RELATIVE SENSITIVITIES OF SAME-DIFFERENT AND
IDENTIFICATION JUDGMENT MODELS TO PERCEPTUAL DEPENDENCE
DANIEL M. ENNIS
PHILIP MORRISRESEARCHCENTER, RICHMOND,VIRGINIA
AND
DEPARTMENTOF PHYSIOLOGY,MEDICALCOLLEGEOF VIRGINIA
F. GREGORYASHBY
DEPARTMENT OF PSYCHOLOGY,UNIVERSITYOF CALIFORNIA,SANTABARBARA
Probabilistic models of same-differentand identificationjudgments are compared (within
each paradigm)withregardto their sensitivityto perceptualdependenceor the degreeto which
the underlyingpsychologicaldimensionsare correlated.Three same-differentjudgmentmodels
are compared. One is a step functionor decisionbound modeland the other two are probabi-
listic variants of a similaritymodelproposedby Shepard. Three types of identificationmodels
are compared: decision bound models, a probabilistic multidimensional scaling model, and
probabilistic modelsbased on the Shepard-Lucechoice rule. The decisionbound modelswere
found to be most sensitive to perceptual dependence, especially when there is considerable
distributional overlap. The same-differentmodelbased on the city-block metric and an expo-
nential decay similarityfunction, and the correspondingidentificationmodelwere found to be

  

Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara

 

Collections: Biology and Medicine; Computer Technologies and Information Sciences