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Classic attention experiment

Do we all have “atten­tion deficits”? Or is there some­thing else going on?

Let’s try this lit­tle exper­i­ment, con­ceived by Simons and Chabris for their clas­sic study on sus­tained inat­ten­tional blind­ness (1999).

–>You will watch a brief video clip, and your chal­lenge is to count the total num­ber of times that the bas­ket­balls change hands. 

PS: Enjoy these 50 brain teasers to test your cog­ni­tive abil­ity. Free, and fun for adults of any age!

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134 Responses

  1. i dunno says:

    This is pretty inter­est­ing. I did see the gorilla, and counted only 27 passes. There were a few ‘fake” passes. Does any­body know the cor­rect #? The study on the stranger ask­ing direc­tions, and chang­ing as the door passed is very inter­est­ing. Great web­site. Glad to find it!

  2. kirsti says:

    haha seri­ously didn’t see the gorilla until i read some­one had seem him. i was only focused on the balls. counted 29–30 i think.

  3. Denis says:

    haha i counted 29 times, i saw the gorilla but did not process the idea that he walked in

  4. terry woodruff says:

    i counted 31 passes , there may have been more but the dam gorilla got in the way.

  5. Seanathan McAndrew says:

    Saw this in class last week. It totally got me.

  6. wdawda says:


  7. johnny says:

    I counted 34, 1 gorilla, and noticed that the white shirt team and black shirt team don’t pass each other the bas­ket­ball but rather they keep one ball between the white shirts and one between the black shirts.

  8. Larry says:

    I watched it twice, but I counted 34 passes.

  9. Crystal says:

    I counted 30 times, and noticed some­one go through the group, but DID NOT notice it was a gorilla. After read­ing the posts and going back to watch it, I was amazed at how it stopped to pound it’s chest and slowly and delib­er­ately it was mov­ing. I didn’t notice but a mov­ing shape!

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