Scientists studying the human tendency to follow the gaze of other people have found a link to the behaviour of lemurs, a distant primate relative. Psychologists at the University of St Andrews said the action was a practical, food-finding skill, dating back to the time of the first primates. ... Humans find it impossible not to look up when they see someone staring upwards at the sky, even when they know it might be a trick. It's been known for some years that several species of non-human primates, apes and monkeys, show the same tendency. But when their ability to use this to find useful information, such as where food is hidden, has been tested, they generally failed.
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