Neuroscience For Kids - stroop effect (2024)

Colors, Colors

The famous "Stroop Effect" is named after J. Ridley Stroop whodiscovered this strange phenomenon in the 1930s. Here is your job: namethe colors of the following words. Do NOT read the words...rather, saythe color of the words. For example, if the word "BLUE" is printed in ared color, you should say "RED". Say the colors as fast as you can. Itis not as easy as you might think!

TRY IT!

Try this Interactive Stroop EffectExperiment. The computer will keep track of the time it takes you tosay the colors of the words.

Why?

The words themselves have a strong influence over yourability to say the color. The interference between the differentinformation (what the words say and the color of the words) your brainreceives causes a problem. There are two theories that may explain the Stroop effect:

Speed of Processing Theory: the interference occurs because words are read faster than colors are named.
Selective Attention Theory: the interference occurs because naming colors requires more attention than reading words.

I think that this puzzle would be easier for a very young child than forolder children or adults. Try this out on some small kids who know theircolors, but cannot yet read! I would imagine that the children would notget confused by this puzzle because the words would not have any meaning to them.

My scores: Test #1 = 10.1 seconds; Test #2 = 22.4 seconds
It took me more than TWICE the amount of time to read the"confusing" words.

There is someevidence that the anterior cingulate area is active in people duringthe Stroop effect.

More experiments to try:

Turn the words upside down or rotate them 90 degrees.
Turn the words "inside out."
Use non-color words such as "dog" or "house."
Use nonsense words such as "kiw" or "thoz."
Compare long words to short words.
Use emotional words such as "sad" or "happy" or "depressed" or "angry."
Color only half of the word or color only the first and last letter of each word.

The original reference to the Stroop paper is: Stroop, J.R. Studiesof interference in serial verbal reactions. J. Exp. Psychol.,18:643-662, 1935. You can even read this complete 1935paper on the web!

If you would like to use theStroop Effect as an experiment in class, here is a lesson ready to go.

Other web resources on the Stroop effect:

Interference -from the American Psychological Association
StroopEffect - from NOVA

TRY IT!

Neuroscience For Kids - stroop effect (7)

New Stroop Tests

Here are three new variations of the Stroop Effect thatyou may not have seen.

Try this Interactive DIRECTIONAL Stroop Effect Experiment. The computer will keep track of the time it takes you to say the LOCATIONof the words.
[Run Directional StroopExperiment]
Try this Interactive NUMBER Stroop EffectExperiment. The computer will keep track of the time it takes you tocount the number of words. [This "Counting Stroop Effect"was described originally by Bush, G. et al., The counting Stroop: Aninterference task specialized for functional neuroimaging--validationstudy with functional MRI. Human Brain Mapping, 6:270-282,1998.]
[Run Number Stroop Experiment]
Try this Interactive ANIMAL Stroop EffectExperiment. The computer will keep track of the time it takes you tosay the NAME of animals you see.
[Run Animal Stroop Experiment]
Shape Stroop Test. Download the test papers. Try the test two ways. First, say what the word says and ignore the shape on each paper. Second, say what the shape is and try to ignore the word.

Are these new tests easier or harder than the original colored wordStroop Effect? Why?

Did you know?

Neuroscience For Kids - stroop effect (8)

Dr. Stroop left the laboratory not long after he published his studies on his "effect" and joined the faculty at David Lipscomb College, a small Christian college in Nashville, TN. He died in 1973 at the age of 76. Read more about "Brother Stroop" (that's what his students called him) in Science News, Vol. 141, pages 312-316, 1992. Also, read about the donation of Stroop's original thesis to Vanderbilt University.