When scientists stimulate nerve cells along that pathway in mice, Augustine says, 'the heart rate immediately dips, they wobble around a little bit and then they fall over.'
The finding, published in November in the journal Nature, offers a biological explanation for fainting that isn't caused by an underlying medical condition. 'A lot of people faint at the sight of blood,' Augustine says, 'or when they're having blood drawn or exposed to a very intense emotional stimulus.'
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