Body's own drug damps down fear

By Alison Motluk THE body’s own opioid system acts as a brake on how much fear we feel – a discovery which may shine light on the neural mechanisms behind anxieties, phobias and even post-traumatic stress disorder. Pairing an innocuous stimulus such as a sound with something undesirable, such as a painful shock, can trigger a “conditioned fear” response in the form of sweaty palms and a racing heart. With time, the stimulus alone is enough to trigger the response. Perplexingly, when people dread something painful,
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