In neurofeedback training we often reference areas of the brain identified by numbers that represent particular functions of the brain. The number system often used was developed by an anatomist named Brodmann and are therefore designated the Brodmann areas. For instance,an area of the brain shown to increase in activation while a participant is concentrating on a difficult task with unwanted environmental noise in the background is the posterior cingulate cortex which can be denoted by Brodmann area 23.
Anxiety is often the result of your body's response to a negative thought pattern. One negative thought leads to another, and another...and another. This is called a negative feedback loop and it is why anxious feelings can grow rapidly and spiral out of control. As maddening as this can be, momentary feelings of anxiety are actually the result of a deeply ingrained process.