For example, when people who fear snakes are shown a picture of a snake, sensors on their skin will detect sweat, a sign of anxiety, even though the people say they do not feel fear.

例如，当害怕蛇的人看到蛇的图片时，他们皮肤上的传感器会检测到汗液，这是焦虑的迹象，尽管他们说自己并不害怕。

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We only feel ticklish if we detect a sense of invasion or attack.

我们只会在察觉受到侵犯或攻击时才会觉得痒。

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The same microscopic movements could also be used to detect whether someone is going to fall ill before they feel any symptoms, say the scientists.

科学家还说，这种微变化还可以用来在生病的症状出现前，诊断出人们有没有患病。

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