A rapid stream of letters will flash on screen (~100 ms each).

Look for two targets:

• T1: A WHITE letter on dark background (it will stand out)
• T2: The letter “X” (in normal black text)

After each stream, you'll be asked: (1) What was the white letter? (2) Did you see an “X”?

There are 56 trials. Focus on the center of the screen.