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Researchers convince people they have three arms–then threaten one with a knife [Video]

subject thinks she has a third arm

A knife-wielding researcher is bearing down on your right hand—or is it your hand? You see three arms in front of you, and you can feel your palms dampen with fear-induced perspiration. But is it your right hand the kitchen knife is plunging toward, or a false, rubber right hand? The dilemma might sound ridiculous, [...]

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