The Stroop Task measures your inhibitory control and selective attention. You'll see color words displayed in colored ink, and your job is to identify the ink color, not read the word.
If you see:
Press B for BLUE (the ink color), not R for red (the word)!
Scientific Background: Based on the classic 1935 J.R. Stroop study, this test measures the conflict between automatic reading and controlled color-naming. Your “interference score” shows how well you can suppress automatic responses.