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When anxiety won't go away
Date:7/6/2012

ent: The researchers showed the colored squares without any unpleasant stimuli and recorded how long the stress reaction acquired earlier lasted. The next day the experiment was continued without the laser stimulus in an effort to monitor the longer-term development.

New paths in the treatment of trauma patients

It became apparent that, as in mice human, probands with lower gene activity for dynorphin exhibited stress reactions lasting considerably longer than those probands who released considerably more. Moreover, in brain scans it could be observed that the amygdala a brain structure in the temporal lobes that processes emotional contents - was also active even if in later testing rounds a green square was shown without the subsequent laser stimulus. "After the negative laser stimulus stopped this amygdala activity gradually became weaker. This means that the acquired anxiety reaction to the stimulus was forgotten," reports Prof. Walter. This effect was not as pronounced in the group with less dynorphin activity and prolonged anxiety. "But the 'forgetting' of acquired anxiety reactions isn't a fading, but, rather, an active process which involves the ventromedial prefrontal cortex," emphasizes Prof. Walter. To corroborate this, researchers found that in the group with less dynorphin activity there was reduced coupling between the prefrontal cortex and the amygdala. "In all likelihood dynorphins affect fear forgetting in a crucial way through this structure," says Prof. Walter. The scientists now hope that by using the results they will be able to develop long-term approaches for new strategies when it comes to the treatment of trauma patients.


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Contact: Dr. Andras Bilkei Gorzo
abilkei@uni-bonn.de
49-228-688-5317
University of Bonn
Source:Eurekalert

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