People are fitting more self-centred,says new research. The shocking death of Louise Wolstenholme suggests this may be truePsychopaths don’t yawn. They might yawn when they’re tired, or bored, or when the conversation switches to a subject that isn’t linked to them,but when other people yawn, psychopaths don’t. They don’t yawn because they don’t give a monkey’s what other people feel.
In this they are different to orangutans, and which apparently laugh when another orangutan laughs; and from elephants,which employ their trunks to stroke an elephant in pain. They are different to macaque monkeys, which make an effort to be kind to their friends. And they are different to women.
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Source: theguardian.com