It's an oddity of physiology - humans can't tickle themselves. Studies suggest this stems from the brain's ability to predict sensations caused by our own movements, removing the surprise necessary for a good tickle. But George Van Doorn, a psychologist at Federation University in Australia, wanted to find out if the brain's predictive power really explains why we can't tickle ourselves. It's a serious question, since tickling gives us a clue as to how the brain processes sensations, and can even teach us a bit about mental illness. (People with schizophrenia, for instance, actually can tickle themselves, for unknown reasons.)
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机译：生理上很奇怪-人类不会挠自己。研究表明，这源于大脑预测我们自身运动引起的感觉的能力，从而消除了好痒的必要惊奇。但是澳大利亚联邦大学的心理学家乔治·范·多恩（George Van Doorn）想要弄清楚大脑的预测能力是否真的可以解释为什么我们不能挠自己。这是一个严重的问题，因为挠痒痒给我们提供了大脑如何处理感觉的线索，甚至可以教会我们一些有关精神疾病的知识。 （例如，患有精神分裂症的人实际上会出于未知原因而为自己发痒。）
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