Development of a world-wide web based contour integration test

Petra Kozma-Wiebe, Steven M. Silverstein, Akos Fehér, Ilona Kovács, Peter Ulhaas, Sandra M. Wilkniss

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Possibilities for dynamic psychophysical experimentation on the World-Wide Web are just beginning to be explored. We sought to develop a Web-based version of a contour integration test that is suitable for clinical studies, and to determine whether the previously described contour integration deficit in schizophrenia could be replicated using the new test. Fields of Gabor patches against a gray background were used as stimuli, and a closed contour had to be located within a noisy background. A two-alternative forced-choice paradigm was developed in which the subject had to identify which direction an egg-shaped contour was pointing. The signal-to-noise ratio of the images, and the spacing between contour elements were kept constant, but the orientation of the contour elements was varied as the critical manipulation. The program to administer the task and record data was implemented within Java. Past results of a contour integration deficit in schizophrenia were replicated. Potential future uses of this test for clinical and research purposes are discussed.

Original languageEnglish (US)
Pages (from-to)971-980
Number of pages10
JournalComputers in Human Behavior
Issue number6
StatePublished - Nov 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Human-Computer Interaction
  • Psychology(all)


  • Contour integration
  • Perception
  • Schizophrenia
  • Vision
  • World-wide web

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