The Stroop Effect

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In this activity, learners experiment with the Stroop Effect by challenging themselves and others to try and read a list of colors as quickly and accurately as possible, with a twist. The Stroop Effect shows what can happen when our brains gets competing instructions. This activity includes step-by-step instructions, suggested experiment extensions, and a section that explains the science behind what is happening in our brains during the experiment.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per group of students

Age Range:
Ages 6 - adult

Resource Type:


Materials List (per group of students)

  • A piece of paper
  • 6 different color markers or crayons
  • A partner
  • A timer or stopwatch


  • Life Sciences
    • Human Body
      • The Brain and Nervous System
    • Human Senses and Perception
      • Vision


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Access Rights:

  • Free access


Source Collection

  • Science Recipes


  • All rights reserved, The Franklin Institute, 2021