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Related Experiment Video

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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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Similarity and decision time in preferential choice.

Sudeep Bhatia1, Timothy L Mullett2

  • 11 Department of Psychology, University of Pennsylvania, Philadelphia, PA, USA.

Quarterly Journal of Experimental Psychology (2006)
|February 17, 2018
PubMed
Summary

When choice options are similar, decision times are longer. This study confirms that option similarity influences decision-making speed, aligning with preference accumulation theories.

Keywords:
Decision timechoicesequential samplingsimilarity

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Area of Science:

  • Cognitive Psychology
  • Decision Science
  • Behavioral Economics

Background:

  • Choice option similarity is a critical factor in multiattribute decision-making.
  • Existing theories of preference accumulation provide a framework for understanding choice behavior.

Purpose of the Study:

  • To investigate the relationship between choice option similarity and decision time.
  • To test predictions derived from preference accumulation theories regarding decision speed.

Main Methods:

  • An experiment involving incentivized binary choices between items of equivalent desirability was conducted.
  • Decision times were measured and analyzed in relation to the similarity of choice options.

Main Results:

  • Decision times were significantly longer when choice options were similar compared to when they were dissimilar.
  • The findings confirmed the predictions that greater option similarity leads to longer decision times, controlling for desirability.

Conclusions:

  • Contextual factors, such as option similarity, significantly impact decision variables like decision time.
  • Computational theories of decision-making accurately predict the effects of contextual variables on choice behavior.