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Conjunctive search for one and two identical targets.

R Ward1, J L McClelland

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213.

Journal of Experimental Psychology. Human Perception and Performance
|November 1, 1989
PubMed
Summary

Feature integration theory

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Information Processing

Background:

  • Feature integration theory (FIT) explains visual search as a serial, self-terminating process.
  • This study investigates FIT's assumptions when applied to displays with two identical targets.

Purpose of the Study:

  • To test the predictions of the serial, self-terminating search (SSTS) model of FIT with dual identical targets.
  • To evaluate alternative models if SSTS proves inadequate.

Main Methods:

  • Experiments involved visual search tasks with displays containing two identical targets.
  • Response times and accuracy were recorded for both positive and negative response trials.

Main Results:

  • The SSTS model accurately predicted performance for positive responses (targets present).
  • However, the model failed to predict performance for negative responses (targets absent), indicating a discrepancy.
  • Explanations like differential search rates or early quitting were ruled out.

Conclusions:

  • The serial, self-terminating search (SSTS) model is insufficient for explaining visual search with dual identical targets, particularly in negative displays.
  • A resource-limited parallel model, derived from the diffusion model, provides a better fit for the observed data.

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