The Thatcher Effect Illusion

Published on
December 2, 2021

Does this person look normal to you?

renshaw

How about now?

image

The eyes, and the brain, can fall prey to a range of optical illusions, for a variety of reasons.
One such illusion is known as the Thatcher Effect. Named for former British Prime Minister Margaret Thatcher, since it was a photo of her that was famously used to illustrate the illusion, shows that the brain cannot properly process a photo of a face which is upside-down.
It demonstrates this by modifying upside down faces, flipping the mouth and eyes right side up. Because of this, and how our minds have learned to recognize faces, the brain believes nothing is wrong...until the image is turned right side up. Only at that point does the brain finally realize that yes, something was indeed very wrong with the image.
The Thatcher Effect demonstrates the importance of the brain’s processing of visual information, and the fact that recognizing faces is something we learn to do as our vision develops.

 

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Testimonials


My eight year old daughter was terrified to go to the eye doctor for fear of her eyes being dilated. The doctor was SO KID friendly! He immediately made her comfortable by engaging her in conversation. It was a geat experience.


Joya B.

Dr. Garbus spent an amazing amount of time to solve my very complicated visual problems. Over the years he has continually achieved results beyond what others felt possible. He is always up to date on the latest science. He is great!


Dolores K.

Family Vision Care Valencia makes it so easy. Staff is knows what they are doing and Dr. Garbus is thorough and kept me well informed during the exam.


Kristy B.

I have been coming to Family Vision Center for almost 20 years. Dr. Garbus has been able to help my vision when other doctors could not. Now my kids see him as well. I highly recommend this office!


Autumn C.

The Doctor is very good. I felt on this visit he seemed rushed. I had questions to ask him but he was already with another patient. I still do not know if my eyes are the same , worse, or better.


Howard B.

All the staff is friendly, helpful and knowledgeable, and has been for all the years I have been going there.


Mary Ann H.
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renshaw (1)

The Thatcher Effect Illusion

Does this person look normal to you? How about now? The eyes, and the brain, can fall prey to a range of optical illusions, for a variety of reasons. One such illusion is known as the Thatcher Effect. Named for former British Prime Minister Margaret Thatcher, since it was a photo of her that was […]

Read More
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