Did You Spot the Gorilla? A Mind-Bending Optical Illusion Experiment

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The discussion centers around a video demonstration of inattentional blindness, where viewers are tasked with counting the number of passes made by a basketball team while a person in a gorilla suit walks through the scene. Participants report varying counts of passes, with most agreeing on numbers between 14 and 16, while some express confusion over the definition of a "pass." Many viewers initially miss the gorilla entirely, highlighting the phenomenon where focused attention on a specific task leads to overlooking other significant visual elements. The gorilla's presence serves as a distraction, prompting reflections on human cognitive processing and the nature of perception. Some participants share personal anecdotes about showing the video to others, noting how frequently people fail to see the gorilla, reinforcing the experiment's point about selective attention. Overall, the thread illustrates the surprising effects of attentional focus and the cognitive biases that can lead to missed observations in everyday situations.

How many passes of the ball did the white team make?

  • 0

    Votes: 0 0.0%
  • 1

    Votes: 0 0.0%
  • 10

    Votes: 0 0.0%
  • 11

    Votes: 0 0.0%
  • 12

    Votes: 2 9.1%
  • 13

    Votes: 0 0.0%
  • 14

    Votes: 12 54.5%
  • 15

    Votes: 5 22.7%
  • 16

    Votes: 2 9.1%
  • 17

    Votes: 1 4.5%

  • Total voters
    22
DaveC426913
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http://viscog.beckman.uiuc.edu/grafs/demos/15.html"
View this video. (Requires Java.) Feel free to view it as many times as necessary.
Then answer the poll question.

I will wait a day or two, then post the result.
 
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11 or 12 depending on how you define a 'pass', but I am pretty sure this was looped pretty hard too.
 
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I saw 15 or 16... Sometimes when they pass each other it's nearly impossible to tell if they threw it back and forth to one another or not.
 
I saw 15 too, I have no clue how cronxeh is getting 11 or 12, but I also don't see how this is an optical illusion, so maybe that 11 or 12 is part of it.
 
I counted 14, but it was a little hard to tell sometimes when other people were blocking the view. What's with the person in the gorilla suit showing up in the middle? :smile: Is that supposed to distract us from counting?
 
Yeah I don't know what is up with the gorilla either :smile:

I remember the first time I counted I did not even notice the gorilla go by, maybe that was the illusion?
 
I didn't see a gorilla O.O
 
Yeah the gorilla must be the illusion.
 
mattmns said:
Yeah the gorilla must be the illusion.

I just watched it again, BWAHAHAHAHAHA How could I not see that before? :smile: :smile: :smile:
 
  • #10
Oh, I missed a pass the first time I watched...there was a really quick one in there. I revise my answer to 15.

Yeah, I'm not sure if the gorilla is the illusion that you are supposed to miss seeing the gorilla while intensely counting, or if the illusion is that the gorilla is supposed to distract you from counting so you miss counting some passes.
 
  • #11
Moonbear said:
Oh, I missed a pass the first time I watched...there was a really quick one in there. I revise my answer to 15.

Yeah, I'm not sure if the gorilla is the illusion that you are supposed to miss seeing the gorilla while intensely counting, or if the illusion is that the gorilla is supposed to distract you from counting so you miss counting some passes.

The illusion is trying to figure out the illusion :eek:
 
  • #12
I think there is a deeper social meaning here. We, as humans, just sit around and do stupid things like counting how many times a team passes a ball, while gorillas are out there slowly taking over the world! We must stop these gorillas now!
 
  • #13
I've seen a verion of this before in which a load of people wandered around in circles passing a breifcase, and half way through someone in a bee costume came to join them. I completely missed it then, but since this time I expected it, it was impossible to not see it.
 
  • #14
WHITE team not both teams - watch carefully, there are 11 passes
 
  • #15
Nah come on, how the hell did you get 11? Can there be that few?

I'd have to go for the 14 there for sure.

I'd bet my left nut that it's 14 :smile:
 
  • #16
cronxeh said:
WHITE team not both teams - watch carefully, there are 11 passes
I definitely counted 15 from the white team. I was worried I might miss some being passed by the black team to someone on the white team since I was focusing on the white team, but as far as I can tell, the black team never passes to the white team.
 
  • #17
cronxeh said:
WHITE team not both teams - watch carefully, there are 11 passes
WHAT?!?? Please define pass. In my opinion any time the ball goes from one person to another, that is a pass. Meaning that those bounce passes are passes.

http://en.wikipedia.org/wiki/Basketball#Passing
 
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  • #18
Ok rewatching there are 14 passes :rolleyes:
 
  • #19
big man said:
I'd bet my left nut that it's 14 :smile:

Ouch... the man's a gambler :smile:

And yea, that gorilla is just tripping me out
 
  • #20
I counted 14, also. The first time through I noticed the gorrilla just as it looked toward the camera. Tripped me out because I thought someone turned into it (hence the illusion).
 
  • #21
no there is at least 16 passes. one part of the movie you have to watch very carefully, there are 3 very rapid passes where one of the white team's players almost blocks the pass from being seen with his body.
 
  • #22
it's not about the passes, it's about missing the gorilla
 
  • #23
'sfunny: I was expecting to see another screaming ghoul trick, consequently all I saw was the gorilla, and I wondered what the whole point was.
 
  • #24
hahahaha how could i have missed that gorilla? I watched it twice and didn't see it but the third time i wasl ike " wait a second, what the hell is that gorilla doing there!" I countd 14 though
 
  • #25
Fantastic! :smile: :smile: :smile:

I rarely get sucked in by this sort of thing anymore but this one got me.
 
  • #26
Drat. You guys are excellent observers. It's not about the passing. It's about what you DIDN'T see. But most of you did.

When I tried this on my family, they were *convinced* that I had pulled a bait & switch on them, showing them a different video.

I would have liked to noit give away the secret, for the sake of future hopefuls, but too many of you have spilled the beans.
 
  • #27
So how many passes were there?

Is it a coincedence that the video is named "Video 15" ?
 
  • #28
Too bad it ruins it for people that know what's going on already. Moonbear, did you see it before or read of the experiment.

I saw it on the Discovery channel, and was like AHHH! HOw'd I miss it! But the 25 other people all missed it so I didn't feel bad.
 
  • #29
Mk said:
Too bad it ruins it for people that know what's going on already. Moonbear, did you see it before or read of the experiment.

I saw it on the Discovery channel, and was like AHHH! HOw'd I miss it! But the 25 other people all missed it so I didn't feel bad.
Nope, never saw this one before. I saw the gorilla the first time I watched and thought the trick was that the gorilla was supposed to distract me from counting passes :redface:, so watched again to count while trying to ignore the gorilla (it's really difficult to do once you know it's there).
 
  • #30
Moonbear said:
Nope, never saw this one before. I saw the gorilla the first time I watched and thought the trick was that the gorilla was supposed to distract me from counting passes :redface:, so watched again to count while trying to ignore the gorilla (it's really difficult to do once you know it's there).

When the gorilla appeared I wasnt sure if he was white or on a white team - so I started thinking about the question, and it turns out they were all white, so then I thought what makes them white - their ethnicity or their t-shirts? See you "assume" they are white because they have white t-shirts, but you don't know! It could be 17 passes, or 14 depending on how you count, and the gorilla is just an eye candy - I was hoping it was a hot chick who would take the costume off to reveal the skimpy bikini underneath :approve: :approve:

dissa--ppoint-edd :biggrin: :-p
 
  • #31
I counted 14 but I'm pretty sure I missed at least 1 so I put 15. It might've been 16.
 
  • #32
This is a demonstration of a cognitive phenomenon known as inattentional blindness. I wouldn't call it an optical illusion, because it really has nothing to do with optics per se, but rather high-level cognitive (attentional) processing of visual stimuli. Many people don't see the gorilla because their attentional resources are devoted to the given task, to the exclusion of other visual events. It may even be that for this particular task, conscious representations of black figures (and thus the gorilla) are actively inhibited.
 
  • #33
hypnagogue said:
This is a demonstration of a cognitive phenomenon known as inattentional blindness. I wouldn't call it an optical illusion, because it really has nothing to do with optics per se, but rather high-level cognitive (attentional) processing of visual stimuli. Many people don't see the gorilla because their attentional resources are devoted to the given task, to the exclusion of other visual events. It may even be that for this particular task, conscious representations of black figures (and thus the gorilla) are actively inhibited.
I used to play with this while at Dodger and Rams [then the LA Rams] games. Look for red in the crowd and the red jumps right out. Look for blue and you see the blue but not the red, etc.
 
  • #34
hypnagogue said:
This is a demonstration of a cognitive phenomenon known as inattentional blindness. I wouldn't call it an optical illusion, because it really has nothing to do with optics per se, but rather high-level cognitive (attentional) processing of visual stimuli. Many people don't see the gorilla because their attentional resources are devoted to the given task, to the exclusion of other visual events. It may even be that for this particular task, conscious representations of black figures (and thus the gorilla) are actively inhibited.
That's pretty cool. I actually saw the guerrila, but completely ignored it (and thus, didn't register it as a guerilla at the time, but now that it's been mentioned i remember)
 
  • #35
Smurf said:
I actually saw the guerrila.

WHOAH! What video were *you* watching? :smile:
 
  • #36
:smile: :smile: :smile: :smile: Smurf :smile: :smile: :cry:
 
  • #37
I saw the gorilla. 3 people I showed the clip to missed it though!


:smile: :smile: :smile: :smile: :smile: :smile: :smile: :smile: :smile: :bugeye:
 
  • #38
The first time I watched the video, I tried to keep my eye on the ball but lost count early on. By the time the gorilla came on I was no longer counting, so I was not distracted and saw it plainly. I then assumed that the point of the illusion was that the gorilla was going to pull a switcheroo on the basketball, so the second time I watched the video, I kept my eyes on the gorilla. No monkey business there. I then watched the video three more times, each time concentrating on a single person from the white team and counting the number of passes that individual made. I got 4 + 5 + 5 = 14, but it seems that this doesn't have anything to do with the question at hand.
 
  • #39
jimmysnyder said:
I got 4 + 5 + 5 = 14, but it seems that this doesn't have anything to do with the question at hand.

Yep. It was all about the gorilla. It seems it works better in a controlled demo than freely on the web, where anyone can view it at varying levels of scrutiny.


Try it on your friends, where you're controlling the demo. See if any of them get it.

I always ask "How many passes does the white team make?"
They watch the video intently, and at the end, confidently say "14!"
And then I say: "Good, now how many gorillas were there?"
They look blank, and then when I show them the video again, they get all suspicious and claim I pulled a switcheroo.
 
  • #40
14? I don't think that is correct. I think you guys are missing a quick pass.
 
  • #41
counting dribble passes too? I thought it was 16.
 
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  • #42
not sure, but I thought I caught a member of the other team tossing a ball to one of the guys on the white team.

No wait, I think they were just standing between a pass and were partially blocked.
 
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  • #43
Answer is.. undefined. Nobody ever mentioned what a "white team" is! :zzz:
 
  • #44
IRRELEVANT!


Show me the monkey!
SHOW ME THE MONKEY!
 
  • #45
This is ridiculous. Come on, fellow geeks, you can freeze-frame whenever you like!

A running commentary
(from someone who's never even watched sports, and would prefer to be moved to tears by a monograph on relativistic electodynamics).

First thing one sees is a white-team guy receiving the ball (who passed it? no one knows), while the guy in black at the back passes to the front, through the guy in white;

0-1
white-black

Then black and white make passes in rapid succession, to the back;

1-2

White dribbles, while black makes a backhand throw:

1-3

Black makes another pass (to the front), while white dissapears from view for a couple of frames, as the girl dribbles behind the guy from the black team;

1-4

White makes a long pass, while the girl in black turns around really quickly and makes a pass to the front;

2-5

White makes two passes, right to middle to left, in the time it takes for black to make one pass, center to right;

4-6
Black passes to the rear left, while white dribbles through the middle; the balls are NOT switched, as you can clearly see in frame-by-frame analysis;

4-7

Black passes back to the front-right; a guy or girl in a gorilla suit enters from the right, but he/she/it appears harmless, so we choose to ignore their presence for now.

4-8

White makes a rather clumsly bounce-pass; black makes two passes in rapid succession, note carefully!

5-10

White makes a high pass from left to right, going over the head of the gorilla suit;

6-11

Black passes from the back center to the front right, as white dribbles through;

6-12

The guy in white makes a pass; he is enjoying himself too much.

7-12

The guy in black makes an underhand pass to the rear left that is almost impossible to see; frame-by-frame analysis illuminates this. Meanwhile, the girl in white bounces once and makes a quick pass to the back right. The gorilla suit gestures to the camera.

8-13

Two very quick passes from the corners to the opposite corners.

9-14

The girl in black politely hands the ball to her teammate, who makes a second pass to the back. Meanwhile, white also makes a pass, also to the back. The gorilla suit walking through stage left.

10-15

White bounces once and passes to the front. Black bounce-passes right-to-left. The gorilla suit is offstage.

11-16

White passes to the back. Black passes right. They are nearly synchronized at this point. I think the pace has picked up from the previous eight seconds.

12-17

White dribbles behind the enemy in the left corner. Black makes a pass on the right side.

12-18

Black passes left. White passes right-forwards.

13-19

Black passes right. White dribbles, then bounce-passes. The guy in black throws the ball in the air and catches it.

14-20
 
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  • #46
I think 9 is why I chose 15.
 
  • #47
rachmaninoff said:
This is ridiculous. Come on, fellow geeks, you can freeze-frame whenever you like!

A running commentary
(from someone who's never even watched sports, and would prefer to be moved to tears by a monograph on relativistic electodynamics).

First thing one sees is a white-team guy receiving the ball (who passed it? no one knows), while the guy in black at the back passes to the front, through the guy in white;

0-1
white-black

Then black and white make passes in rapid succession, to the back;

1-2

White dribbles, while black makes a backhand throw:

1-3

Black makes another pass (to the front), while white dissapears from view for a couple of frames, as the girl dribbles behind the guy from the black team;

1-4

White makes a long pass, while the girl in black turns around really quickly and makes a pass to the front;

2-5

White makes two passes, right to middle to left, in the time it takes for black to make one pass, center to right;

4-6
Black passes to the rear left, while white dribbles through the middle; the balls are NOT switched, as you can clearly see in frame-by-frame analysis;

4-7

Black passes back to the front-right; a guy or girl in a gorilla suit enters from the right, but he/she/it appears harmless, so we choose to ignore their presence for now.

4-8

White makes a rather clumsly bounce-pass; black makes two passes in rapid succession, note carefully!

5-10

White makes a high pass from left to right, going over the head of the gorilla suit;

6-11

Black passes from the back center to the front right, as white dribbles through;

6-12

The guy in white makes a pass; he is enjoying himself too much.

7-12

The guy in black makes an underhand pass to the rear left that is almost impossible to see; frame-by-frame analysis illuminates this. Meanwhile, the girl in white bounces once and makes a quick pass to the back right. The gorilla suit gestures to the camera.

8-13

Two very quick passes from the corners to the opposite corners.

9-14

The girl in black politely hands the ball to her teammate, who makes a second pass to the back. Meanwhile, white also makes a pass, also to the back. The gorilla suit walking through stage left.

10-15

White bounces once and passes to the front. Black bounce-passes right-to-left. The gorilla suit is offstage.

11-16

White passes to the back. Black passes right. They are nearly synchronized at this point. I think the pace has picked up from the previous eight seconds.

12-17

White dribbles behind the enemy in the left corner. Black makes a pass on the right side.

12-18

Black passes left. White passes right-forwards.

13-19

Black passes right. White dribbles, then bounce-passes. The guy in black throws the ball in the air and catches it.

14-20


Rachie, you have way too much time on your hands.
 
  • #48
DaveC426913 said:
Drat. You guys are excellent observers. It's not about the passing. It's about what you DIDN'T see. But most of you did.
When I tried this on my family, they were *convinced* that I had pulled a bait & switch on them, showing them a different video.
I would have liked to noit give away the secret, for the sake of future hopefuls, but too many of you have spilled the beans.
I was suspicious after getting half a dozen "jump-out-at-you" tricks. I just missed the fun and now it won't work for me:mad: .
 
  • #49
thank you for completely ruining my day. I didn't see a gorilla and now I feel like an idiot.
 
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