Face Recognition
The temporal lobe of the brain is partly responsible for our ability to recognize faces. Some neurons in the temporal lobe respond to particular features of faces. Some people who suffer damage to the temporal lobe lose their ability to recognize and identify familiar faces. This disorder is called prosopagnosia.

When the appearance of a face is changed, neurons in the temporal lobe generate less activity. Here is an interesting experiment:

Do you recognize the famous people in the pictures below? It may be difficult for you to recognize these people when they are upside-down. To identify these people, move your mouse so the cursor is over each picture. This will flip the pictures right-side up.

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Exactly how people recognize faces is not completely understood. For some reason, it is difficult to recognize some faces when they are upside-down. Here is another example illustrating this phenomenon.
These top photos look much the same. Let's flip them over. In the bottom left, the photo on the top left has been flipped over. What happens if you flip over the photo on the top right? To do this, move your mouse over the photo on the bottom right. Now how different are the photos?

For more about face recognition, see:

Take the FACE MEMORY TEST. There are two versions of the test:
[Face Memory Test - Version 1] | [Face Memory Test - Version 2]

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