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THE STROOP EFFECT and a stroop test
Your brain’s many modules are specialized to perform different tasks. The Stroop effect demonstrates how the information arising from the processing of different modules can cause interference.
Try this little Stroop test. Here are 25 words. Time yourself reading the words aloud, left to right, line by line, without errors: “grey, black, white,” etc.

Now time yourself reading the COLOR of each of the 25 words aloud, left to right, line by line. For example, the first three words would be “black, white, grey.” Not so easy this time—it takes considerably longer.
How come?