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Related Experiment Videos

Nominal and physical decision criteria in same-different judgments

Z Eviatar1, E Zaidel, T Wickens

  • 1Institute of Information Processing and Decision Making, University of Haifa, Mount Carmel, Israel.

Perception & Psychophysics
|July 1, 1994
PubMed
Summary

This study introduces a model explaining letter pair judgments by comparing physical and nominal dimensions. Findings clarify the fast-same effect and error patterns in shape versus name tasks.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Perception

Background:

  • Letter pair judgments involve comparing physical (shape) and nominal (name) features.
  • Existing models struggle to explain phenomena like the fast-same effect and nominal-physical disparity.

Purpose of the Study:

  • To propose and test a model explaining same/different judgments based on independent physical and nominal comparisons.
  • To account for the fast-same effect, false-different errors, and nominal-physical disparity.

Main Methods:

  • Subjects performed shape and name tasks with and without response deadlines.
  • Stimuli were presented foveally (both hemispheres) or unilaterally (single hemisphere).
  • Response times and error patterns were analyzed.

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Main Results:

  • The nominal-physical disparity vanished with foveal presentation when comparing congruent and incongruent data.
  • The fast-same effect was observed solely in the shape task.
  • A preponderance of false-different errors occurred exclusively in the name task.
  • Central trial data aligned with the model's predictions, while lateralized trial data showed partial conformity.

Conclusions:

  • The proposed model successfully explains key findings in same/different letter pair judgments.
  • Independent physical and nominal comparison processes are crucial for understanding these judgments.
  • The model offers insights into the interplay between visual perception and cognitive decision-making.