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Human Brain Reacts Faster To Fearful Faces
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Posted by admin in Health (Sunday October 14, 2007 at 10:03 am)
You may not be fully dressed without a smile, but a look of horror will make a faster first impression. Vanderbilt University researchers have discovered that the brain becomes aware of fearful faces more quickly than those showing other emotions.
New York (EON) - You may not be fully dressed without a smile, but a
look of horror will make a faster first impression. Vanderbilt
University researchers have discovered that the brain becomes aware of
fearful faces more quickly than those showing other emotions.
âThere are reasons to believe that the brain has evolved mechanisms
to detect things in the environment that signal threat. One of those
signals is a look of fear,â David Zald, associate professor of
psychology and a co-author of the new study, said. âWe believe that
the brain can detect certain cues even before we are streetwear clothes of them, so
that we can direct our attention to potentially threatening situations
in our environment.â
Randolph Blake, Centennial Professor of Psychology, and Eunice Yang,
doctoral student, were co-authors of the study, which will appear in
the November 2007 issue of Emotion.
The researchers set out to determine if we become aware of fearful,
neutral or happy expressions at the same emo fashion or if one of these
expressions reaches our awareness faster than the others. To do this,
they needed to find a way to slow down the speed customized playing cards which subjects
processed facial information â which usually takes less than 40
milliseconds. At those high speeds it is full color custom playing cards to tell which
promo playing cards rise to awareness the fastest.
Yang, the lead author of the study, realized that a technique being
used in Blakeâs lab might provide a solution to the problem. The
technique, continuous flash suppression, keeps full color playing cards from becoming
aware of what they are seeing for up to 10 seconds. Using this
technique, the team had research subjects look at a screen through a
viewer, similar to the eyepieces on custom playing cards microscope, which allowed
different images to be presented to each eye. Many images were rapidly
presented to one eye while a static image of a face renters insurance presented to
the other. The multiple images served as visual ânoise,â
suppressing the image of the face. The subjects indicated when they
first became aware of poker size playing cards a face, enabling the researchers to
determine if the expression on the face had any impact on how quickly
the subject became aware of it.
The team found that subjects became aware of faces jumbo playing cards had fearful
expressions before neutral or happy faces. They believe a brain area
called the amygdala, which shortcuts the normal brain pathway for
processing visual images, is responsible.
âThe amygdala receives information before it goes to the cortex,
which best life insurance where most visual information goes first. We think the
amygdala has some crude ability to process stimuli and that it can cue
some other visual areas to what they need to focus on,â Zald said.
Zald and his colleagues believe the eyes of the fearful face play a
key role.
âFearful eyes are a particular shape, where you get more of the
whites of the eye showing,â he said. âThat may be the sort of
simple feature that the amygdala can pick up on, because itâs only
playing cards promotional a fairly crude representation. That fearful eye may be
something thatâs relatively hardwired in there.â
A surprising finding was that subjects perceived happy faces the
slowest.
âWhat we believe is happening is that the happy faces signal safety.
If something is safe, you donât have to pay attention to it,â Zald
said.
Next, volvo insurance researchers will explore how this information influences our
behavior.
âWe are interested in now exploring what this means for behavior,â
Yang said. âSince these expressions are being processed indie fashion our
awareness, do they affect our behavior and our decision honda insurance If so,
how?â
The research was supported by funding from the National Institutes of
Health. Blake and Zald are Vanderbilt car insurance Center for Research on
Human Development investigators.
No emo clothes for Human Brain Reacts Faster To Fearful Faces
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