The challenge
Count every letter F in the following sentence — read it only once: "FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS."
Objective
Demonstrate how selective attention and automatic processing cause us to overlook details in plain sight.
Materials
Just your eyes.
Description
This classic attention test shows how the brain filters information based on expectations and habits. Function words like "of" are processed so efficiently that they become nearly invisible to conscious attention. The same mechanism operates when we fail to notice opportunities, patterns, or details in our own lives that do not fit our existing mental map.