Before undertaking his studies , morgan had expected the best-performing trainees to be the least stressed , and so to produce the least noradrenaline and cortisol .
Yes , they produce more cortisol and noradrenaline , but crucially , they also ramp up production of calming factors that help keep the brain 's higher functions intact .
The paper also suggests the action of noradrenaline , a hormone released by the mid-brain , can evoke positive emotions , hallucinations and other features of the near-death experience .
文章中也提到由中脑释放的去甲肾上腺素可以引起愉悦的幻觉以及其他濒死体验的特征。
The most potent protective factor , however , is a neurotransmitter called neuropeptide y ( npy ) , which binds to receptors on neurons in the prefrontal cortex and alters their response to noradrenaline , acting as a brake to its accelerator pedal .