Sharp Brains: Brain Fitness and Cognitive Health News

Attention and working memory

Do we have selec­tive atten­tion? Do we all have “atten­tion deficits”? or are they “work­ing mem­ory” challenges?

basketballLet’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.

Click here to view the Bas­ket­ball Exper­i­ment clip (To view it, you will need to have Java active in your browser. The video is fairly large, 7.5MB, and it might take a while to fin­ish loading.)

You can read about the fas­ci­nat­ing results here.

Credit for pic: Haines World

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Categories: Attention and ADD/ADHD, Brain Teasers, Cognitive Neuroscience, Education & Lifelong Learning, Health & Wellness, Professional Development

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134 Responses

  1. Deloris says:

    I only saw the gorilla after I went back to watch it with­out count­ing the passes. The first time I watched it twice and counted 24 then 29 times and never saw the gorilla. So I guess with watch­ing the ball I did not see the gorilla and with watch­ing for the gorilla I couldn’t count the num­ber of passes. One thing at a time, I guess.

  2. Brian K says:

    Man I feel like such a tard for cheat­ing and look­ing at the answer first, but I counted 34.

  3. Nessy says:

    my teacher loves this site, i like the gurilla, how many times did tyhey actu­ally pass the ball i got like 30 times.?

  4. ricardo says:

    i counted 31 passes but at the end of the video 1 pass is about to hap­pen but the video stops so its 31

  5. sorcha says:

    got dis­tracted by the gorilla couldnt keep count of the basketballs

  6. Gaurav says:

    Hi,
    I counted 27 for the first time and didn’t noticed the gorilla how­ever after read­ing the com­ments i saw that video again and noticed the gorilla and noticed 29 passes.

    Just wanted to know Per­sonal who observed gor­rila first time are less stressed? Wats ur view on this.?

  7. Margaret says:

    I totally lost count when the gorilla came in. Then I just watched the gorilla and stopped count­ing. lol

  8. Karma says:

    I counted 29 passes and briefly noticed the gorilla… but I wanted to count the passes so I didn’t watch him much. I’m not even sure if he got the ball :p

  9. Hedin R Joensen says:

    I counted 32 hand-offs and 1 raged gorilla.
    I counted the hand-offs by focus­ing on both bas­ket­balls at the same time and remem­ber­ing who had the ball the last time I checked…

    I can­not assume that I counted cor­rectly. Does any­one know the ‘actual’ num­ber of hand-offs ?

    Hedin.

  10. James says:

    I counted 27, plus 1 gorilla.

  11. Susie says:

    The first time I watched I counted 30 passes,saw the gorilla & the S’s, but didn’t notice the white/white and black/black pass­ing com­bi­na­tions. I’m think­ing that it’s because I’ve been an ele­men­tary teacher for 20 years. For exam­ple, I’ve had to train myself to watch all of my chil­dren on the play­ground at the same time, though they may be doing dif­fer­ent activ­i­ties. I have to con­duct a small read­ing group, while mon­i­tor­ing the com­puter sta­tion, the inde­pen­dent work­ers, etc. to make sure that every­one is on task while inter­act­ing with the read­ing group as well as tak­ing men­tal notes to write down infor­mal assess­ment grades for each child in the read­ing group between that group and the next.

  12. Susie says:

    I watched it a sec­ond time, focus­ing on the white shirts pass­ing to white shirts and got 15. The third time I focused on black shirts pass­ing to black shirts and counted 20, though I wasn’t quite sure because it looked as though the ball had been passed off out of view a cou­ple of times. The sec­ond and third time I did notice the gorilla, but I didn’t notice the S’s, even though I had noticed them the first time I watched.

  13. kayare says:

    i counted 28 but the gorilla got in the way then i lost count.. so how many passes are there??

  14. nick says:

    I only counted 29 and I saw the mon­key the first the only rea­son I watched it twice more is because some ppl were say­ing 30 + times I counted 29 three times

  15. nick says:

    My bad 33 passes and the mon­key and blacks pass 2 black and white pass to white.……and they pass in a sequence they only pass to the same per­son each time

  16. Hameed says:

    I see 14 times ball changed hands between white dress group and 18 times among black dress group…

  17. Ash02 says:

    31

  18. LaLaLa2012 says:

    I didn’t see the gorilla you guys are talk­ing about. Or the fly­ing pig…

  19. ardit says:

    32 I didn’t see any gorilla.

  20. Kimmie says:

    I seen two teams of three, two balls and one gorilla. Between the two teams I counted 33 passes.

  21. benedict says:

    the visual noise was very dis­tract­ing, its futile to count the passes… no I did not see the gorilla the first time…

  22. chris says:

    well, i counted 29 then 24 and saw the gorilla both times.

  23. Muddy says:

    Saw a black thing in the video but was busy in count­ing passes..thay come out to be 28

  24. Tammy says:

    i counted 29

  25. hailrasec says:

    29

  26. 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!

  27. 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.

  28. Denis says:

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

  29. terry woodruff says:

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

  30. Seanathan McAndrew says:

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

  31. wdawda says:

    23

  32. 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.

  33. Larry says:

    I watched it twice, but I counted 34 passes.

  34. 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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