Coach's Library · Psychology

The Invisible Gorilla: You Don't See What You Don't Look For

The selective-attention test — a two-minute lesson in why scanning is everything.

Cam Jolley

Co-Founder & Academy Coach, Coach Central

There's a famous test where people counting basketball passes completely miss a person in a gorilla suit walking through the middle of the screen, and it's the single best demonstration of why a player who isn't looking for information genuinely cannot see it.

The demonstration

Focused on counting passes, roughly half of viewers miss an obvious gorilla walking through the scene. It's called inattentional blindness — attention is a spotlight, and whatever's outside it might as well not exist. The lesson lands harder because you experience it yourself: you didn't see the gorilla not because you're slow, but because you weren't looking for it.

Why I show players this

Because it makes an abstract coaching point undeniable. When I tell a player to scan, I'm not nagging — I'm telling them that the free teammate, the defender closing in, the space in behind, all of it is a gorilla they'll walk right past if they aren't actively looking. Perception isn't passive; you have to point your attention on purpose. It connects straight to everything I coach about reading the game before the ball arrives. The information is out there. Whether a player sees it is a habit, and habits can be trained.

How I'd use it this week

Show your players the test, let them miss the gorilla, then connect it to scanning. Reframe 'check your shoulder' as 'go find the gorilla' — and watch them start looking on purpose.

Takeaways

Inattentional blindness: we miss even obvious information when our attention is elsewhere.
Perception is active — a player who isn't looking for information genuinely can't use it.
It makes scanning undeniable: the free teammate is a 'gorilla' you'll miss if you don't look.

Read the original

Selective Attention Test (Simons & Chabris, video). The classic demonstration of inattentional blindness. youtu.be/vJG698U2Mvo

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