Tolerance of locus coeruleus neurones to morphine and suppression of withdrawal response by clonidine. (semanticscholar.org)
But, in the sleep - deprived brain, the amygdala seemed to be «rewired,» coupling instead with a brain stem area called the locus coeruleus, which secretes norepinephrine, a precursor of the hormone adrenaline that triggers fight - or - flight type reactions. (scientificamerican.com)
And when it comes to the common experience of reliving moments from one's life, one culprit might be the locus coeruleus, a midbrain region that releases noradrenaline, a stress hormone one would expect to be released in high levels during trauma. (scientificamerican.com)