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Fear centre - amygdala: Amygdala is an emotional nucleus of the brain. It plays primary role in triggering fear response. It alerts other brain structures. The result is the fear responses: rapid heart-beat, increased blood pressure and a burst of adrenaline.

after the fear activation thalamus - the processing hub - and then the cortex, which analyzes the data and decides whether they require a fear response. If they do, the cortex signals amygdala and the body stays on alert.

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