======Change Blindness======


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**Alternative titles:** Spot the Difference Illusion  
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====Summary====                   
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====Procedure====  
  - Display an image to participants.  
  - Replace it with a nearly identical image that has one small alteration.  
  - Continue alternating the two images in a loop.  
  - Ask participants to identify the change.  
  - After participants notice the difference, point out how it becomes obvious once detected.



====Links==== 
Gradual change blindness - Michael Cohen: 
{{youtube>EARtANyz98Q?}}\\

Why You Miss Big Changes Right Before Your Eyes - NOVA: 
{{youtube>VkrrVozZR2c?}}\\

📄 Change Blindness: [[https://sites.socsci.uci.edu/~ddhoff/cb.html]]\\

====Variations====
  * Use photographs of real-world scenes instead of drawings.  
  * Introduce a blank screen between image transitions to increase difficulty.  
  * Test multiple participants and record how long it takes each to notice the change.



====Safety Precautions====
  * No specific safety precautions required for this demonstration.




====Questions to Consider====
  * Why does it take so long to notice the change? (Because our attention is limited, and we do not construct detailed representations of the entire visual scene.)  
  * Once you find the change, why does it become obvious every time? (Because attention is now directed toward that part of the image, making the difference stand out.)  
  * What does this suggest about how our brain processes visual information? (It suggests that we rely on selective attention rather than storing detailed representations of the whole scene.)