Characterizing perceptual performance at multiple discrimination precisions in external noise

Seong-Taek Jeon, Zhong-Lin Lu, Barbara Anne Dosher

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Existing observer models developed for studies with the external noise paradigm are strictly applicable only to target detection or identification/discrimination of orthogonal target(s). We elaborated the perceptual template model (PTM) to account for contrast thresholds in identifying nonorthogonal targets. Full contrast psychometric functions were measured in an orientation identification task with four orientation differences across a wide range of external noise levels. We showed that observer performance can be modeled by the elaborated PTM with two templates that correspond to the two stimulus categories. Sampling efficiencies of the human observers were also estimated. The elaborated PTM provides a theoretical framework for characterizing joint feature and contrast sensitivity of human observers
Original languageEnglish
Pages (from-to)B43-58
Number of pages16
JournalJournal of the Optical Society of America A
Issue number11
Publication statusPublished - Nov 2009


  • external noise paradigm
  • perceptual template model
  • external noise


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