The amygdala also activates a brain-stem structure called the locus coeruleus, akin to the brain’s own sympathetic nervous system. 32 It sends norepinephrine-releasing projections throughout the brain, particularly the cortex. If the locus coeruleus is drowsy and silent, so are you. If it’s moderately activated, you’re alert. And if it’s firing like gangbusters, thanks to inputs from an aroused amygdala, all neuronal hands are on deck."
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