Word: cortex
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PREFRONTAL CORTEX...
...control due to either a stuck accelerator or failed brakes, it's not always clear which part of the brain is at fault. It may turn out that some anxiety disorders are caused by an overactive amygdala (the accelerator) while others are caused by an underactive prefrontal cortex (call it the brake...
...stress disorder and some without, to see which areas of the brain light up when they hear tapes recounting their most troubling memories. So far, the signals in the amygdala appear to be more active in those with PTSD than in those without. In addition, signals to the prefrontal cortex of PTSD subjects seem to be weaker than in those without the disorder. Perhaps this explains why the patients still feel threatened even when they are perfectly safe...
...mistake, however, to think that pills alone can soothe your neurochemistry. Remember the cortex? That's where you would expect psychotherapy to work, increasing the repertoire of calming messages that can be passed along to the amygdala. Certain desensitization techniques can also help the brain learn, through the hippocampus, to be less reactive. Of course, you have to do it right. Reliving a trauma too soon after it happened could also make the memory harder to erase...
...HIGH ROAD Only after the fear response is activated does the conscious mind kick into gear. Some sensory information, rather than traveling directly to the amygdala, takes a more circuitous route, stopping first at the thalamus--the processing hub for sensory cues--and then the cortex--the outer layer of brain cells. The cortex analyzes the raw data streaming in through the senses and decides whether they require a fear response. If they do, the cortex signals the amygdala, and the body stays on alert...