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Numerical stroop effect.

Allen H Wolach1, Maureen A McHale, Alina Tarlea

  • 1Institute of Psychology, Illinois Institute of Technology, Chicago, IL 60616, USA. wolach@iit.edu

Perceptual and Motor Skills
|April 3, 2004
PubMed
Summary

The numerical Stroop effect shows that processing mismatched digits takes longer than symbols or letters. Matched digits, however, are processed faster, indicating a facilitation effect in numerical tasks.

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Area of Science:

  • Cognitive Psychology
  • Experimental Psychology

Background:

  • The Stroop effect is a well-documented phenomenon in cognitive psychology, typically demonstrated using color words.
  • Investigating numerical stimuli offers a novel approach to understanding interference and facilitation in cognitive tasks.

Purpose of the Study:

  • To examine the numerical Stroop effect using digit stimuli instead of color words.
  • To compare reaction times across different numerical and symbolic conditions.

Main Methods:

  • Four undergraduate students (2 male, 2 female; mean age 19.5 years) participated.
  • Conditions included: Symbols (-, +++, ===, ::, :::), Alphabetic Characters (C, AAA, DD, BBB, DDD), Matched Digits (e.g., 1, 4444), and Mismatched Digits (e.g., 2, 1111).
  • Participants performed counting and reading tasks.

Main Results:

  • Mismatched Digits condition led to longer reaction times compared to Symbols and Alphabetic Characters.
  • Reading Mismatched Digits was slower than reading Alphabetic Characters.
  • Matched Digits condition showed faster reaction times than Alphabetic Characters (facilitation).

Conclusions:

  • The numerical Stroop effect is observable, with interference effects similar to the color Stroop.
  • Numerical stimuli can elicit both interference and facilitation, depending on stimulus congruence.
  • This study extends Stroop effect research into the domain of numerical cognition.

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