Why you can miss a gorilla

The aha, in writing

1. Viewers watched two teams pass basketballs and had one job: count the passes made by one team.
2. Across every version of the study, 46 percent of 192 viewers never noticed the surprise that walked through the game.
3. Even when the gorilla stopped and thumped its chest for nine seconds, half of 12 new viewers missed it, because counting used up their attention.