Read this sentence:
FINISHED FILES ARE THE RESULT OF YEARS
OF SCIENTIFIC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS.
Now count the F’s in that sentence. Count them ONLY ONCE.
Do not go back and count them again. Then see below:
There are 6 F’s in the sentence. Most people only find 3 of them. If you spotted 4, you’re above average. To see 5 is rare. If you caught all 6, awesome.
Most people forget the OFs. For whatever reason we miss them when counting. Some have suggested that our brain sees a “V” instead of an “OF,” but I could not find any evidence of this beyond reposts of this post. Others note that because OFs are relatively unimportant, our brain fails to notice the entwined Fs. Or perhaps during (quick) reading the brain focus on “lexical” words, and not so much on “grammatical” words. Or maybe we miss them even because “OF” sounds like “OV” in our minds and is passed over; our ability to assign meaning to words in our heads overrides shape recognition.
Whatever the case, it’s a fun brain teaser.
[Via David P. Brown]