Catswatch

Smiles may take a while, but a horrified expression in a sure-fine attention getter, US researchers said recently based on a study of how fast people process facial expressions. The fearful facial expressions make a beeline to the alarm center of the brain known as the amygadla, cuing humans to potential threats.
We think what is happening with fear is that this is a critical threat signal for us. Fear tells you something is wrong and you need to attention. To find out which images get the brain’s attention first, the nesearmens, used a technique called visual flash suppression that slow down the brain’s response to facial expressions-which typically register in less than 40 milliseconds.
The researchers had people look into a special viewer that allowed each eye to see different images at the same time. It you present different images to the two eyes, usually you will only perceive one of them at a time. The image that registers with the brain typically depends on which eye in dominant for that person.
But if one of the eyes in presented by a dynamic, changing stimulus, it will basically suppress perception from the other eyes, Using this approach, the researchers showed, people a static image of a face in one eye and a series of rapidly presented, random images in another creating a type of visual.

Portugues | Francais | Espanol | Deutsche | Italiano | Chinese | Korean | Japanese