The Simon & Chabris study explores inattentional blindness - our... Show more
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Updated Apr 4, 2026
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Simon and Chabris Study on Cognitive Psychology - OCR A-Level
mia
@miaratcliff
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The Inattentional Blindness Experiment
Ever missed something obvious right in front of you? Simon and Chabris set out to investigate several factors affecting inattentional blindness through a cleverly designed lab experiment. They wanted to understand how factors like video style, task difficulty, and the nature of unexpected events influence our perception.
Their method involved 192 participants watching videos of basketball players passing balls, with instructions to count specific passes. The experiment had multiple variables: participants watched either a transparent (superimposed) or opaque (realistic) video, followed either a white or black team, completed an easy or difficult counting task, and might see either an "umbrella woman" or "gorilla" unexpectedly walk through the scene.
The results were striking - overall, 46% of participants completely missed the unexpected event! The opaque condition produced higher detection rates (67%) than the transparent condition (42%). Additionally, the umbrella woman was noticed more often than the gorilla (65% vs 44%), suggesting that similarity to attended events affects detection.
Did you know? Objects can pass directly through our spatial area of focus and still not be "seen" if we're not specifically attending to them. Your brain filters out more than you realize!
Conclusions and Evaluation
Simon and Chabris concluded that approximately half of people will fail to detect unusual events while engaged in tasks requiring visual attention. The study demonstrated that inattentional blindness increases with task difficulty and decreases when unexpected events share similarities with what we're already watching.
The research method offered strong control over variables through standardized laboratory conditions, ensuring all videos were the same length (75 seconds). However, the task of watching a filmed event could be considered somewhat contrived, potentially limiting ecological validity. The researchers used highly standardized procedures for questioning participants, leading to consistent answers that suggest good reliability.
While the sample size was substantial (192 observers), there are limitations to consider. The participants were university undergraduates who may have higher cognitive abilities than the general population. Additionally, the self-selected sample might have been more motivated to perform well on the tasks than average people would be.
Try this yourself! Search for "invisible gorilla experiment" online to experience this phenomenon firsthand - you might be surprised at what you miss!
Ethical and Cultural Considerations
The researchers maintained ethical standards by obtaining informed consent from all participants and conducting thorough debriefing sessions afterward. Participants even had the option to review the tape again if they wished, ensuring they understood the purpose of the research.
An interesting consideration is the potential for cultural differences in attention processing. Research by Hudson (1960) suggests that children from individualist cultures learn to interpret two-dimensional films as three-dimensional, but children from collectivist cultures may not develop this same interpretation. This raises the possibility that Simon and Chabris' findings on inattentional blindness might not apply universally across all cultures.
The study provides valuable insights into how our attention works in everyday life. It helps explain common experiences like missing objects that are "right in front of us" or failing to notice changes in our environment. Understanding these limitations of human perception can help us design better systems that account for these attentional blindspots.
Consider this: How might your own cultural background influence what you notice or miss in your everyday environment?
We thought you’d never ask...
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David K
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very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Simon and Chabris Study on Cognitive Psychology - OCR A-Level
mia
@miaratcliff
The Simon & Chabris study explores inattentional blindness - our remarkable tendency to miss obvious events when our attention is focused elsewhere. This groundbreaking research demonstrated how people can fail to notice unexpected events (like someone in a gorilla suit... Show more
The Inattentional Blindness Experiment
Ever missed something obvious right in front of you? Simon and Chabris set out to investigate several factors affecting inattentional blindness through a cleverly designed lab experiment. They wanted to understand how factors like video style, task difficulty, and the nature of unexpected events influence our perception.
Their method involved 192 participants watching videos of basketball players passing balls, with instructions to count specific passes. The experiment had multiple variables: participants watched either a transparent (superimposed) or opaque (realistic) video, followed either a white or black team, completed an easy or difficult counting task, and might see either an "umbrella woman" or "gorilla" unexpectedly walk through the scene.
The results were striking - overall, 46% of participants completely missed the unexpected event! The opaque condition produced higher detection rates (67%) than the transparent condition (42%). Additionally, the umbrella woman was noticed more often than the gorilla (65% vs 44%), suggesting that similarity to attended events affects detection.
Did you know? Objects can pass directly through our spatial area of focus and still not be "seen" if we're not specifically attending to them. Your brain filters out more than you realize!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Conclusions and Evaluation
Simon and Chabris concluded that approximately half of people will fail to detect unusual events while engaged in tasks requiring visual attention. The study demonstrated that inattentional blindness increases with task difficulty and decreases when unexpected events share similarities with what we're already watching.
The research method offered strong control over variables through standardized laboratory conditions, ensuring all videos were the same length (75 seconds). However, the task of watching a filmed event could be considered somewhat contrived, potentially limiting ecological validity. The researchers used highly standardized procedures for questioning participants, leading to consistent answers that suggest good reliability.
While the sample size was substantial (192 observers), there are limitations to consider. The participants were university undergraduates who may have higher cognitive abilities than the general population. Additionally, the self-selected sample might have been more motivated to perform well on the tasks than average people would be.
Try this yourself! Search for "invisible gorilla experiment" online to experience this phenomenon firsthand - you might be surprised at what you miss!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ethical and Cultural Considerations
The researchers maintained ethical standards by obtaining informed consent from all participants and conducting thorough debriefing sessions afterward. Participants even had the option to review the tape again if they wished, ensuring they understood the purpose of the research.
An interesting consideration is the potential for cultural differences in attention processing. Research by Hudson (1960) suggests that children from individualist cultures learn to interpret two-dimensional films as three-dimensional, but children from collectivist cultures may not develop this same interpretation. This raises the possibility that Simon and Chabris' findings on inattentional blindness might not apply universally across all cultures.
The study provides valuable insights into how our attention works in everyday life. It helps explain common experiences like missing objects that are "right in front of us" or failing to notice changes in our environment. Understanding these limitations of human perception can help us design better systems that account for these attentional blindspots.
Consider this: How might your own cultural background influence what you notice or miss in your everyday environment?
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user