New Scientist
Volume 202, Issue 2708, 13 May 2009, Pages 30-33
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Cover Story
The new witch doctors: How belief can kill

https://doi.org/10.1016/S0262-4079(09)61325-7Get rights and content

The placebo effect has an evil twin and you could be one of the millions of victims. Alarmingly, it can even be catching

Section snippets

Voodoo nouveau

You might think this sort of thing is increasingly rare, and limited to remote tribes. But according to Clifton Meador, a doctor at Vanderbilt School of Medicine in Nashville, Tennessee, who has documented cases like Vanders, the curse has taken on a new form.

Take Sam Shoeman, who was diagnosed with end-stage liver cancer in the 1970s and given just months to live. Shoeman duly died in the allotted time frame – yet the autopsy revealed that his doctors had got it wrong. The tumour was tiny and

Real consequences

It is also unclear who is susceptible. A person's optimism or pessimism may play a role, but there are no consistent personality predictors. Both sexes can succumb to mass psychogenic illness, though women report more symptoms than men. Enck has shown that in men, expectancy rather than conditioning is more likely to influence nocebo symptoms. For women, the opposite is true. “Women tend to operate more on past experiences, whereas men seem more reluctant to take history into a situation,” he

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