The effect, in the words of one surgeon, was the creation of "two separate spheres of consciousness".(注:Sperry,p229.) This effect was revealed by various psychological tests. These made of two facts. We control our right arms with our left hemispheres, and vice versa. And what is in the right halves of our visual fields we see with our left hemispheres, and vice versa. When someone's hemispheres have been disconnected, psychologists can thus present to this person two different written questions in the two halves of his visual field, and can receive two different answers writtenby this person's two hands. Here is a simplified version of the kind of evidence that such tests provide. One of these people is shown a wide screen, whose left half is red and right half is blue. On each half in a darker shade are the words, 'How many colours can you see?' With both hands the person writes, 'Only one'. The words are now change to read, 'Which is the only colour that you can see?' With one of his hands the person writes 'Red', with the other he writes 'Blues'. Derek Parfit,<Reasons and Persons>, p.245. 以上是这位哲学家的书中的一段，第一句是他说有一位外科医生所提出的对这个手术 的结论:'产生两个不同领域的意识'。(这个外科医生是Sperry?) 第二、三段是他认为有些心理实验证明此事，以及他自己提出的这些心理实验的简化版本 (依照他对这个手术结果的理解)。 请问各位大大这样的理解是否恰当?但是这本书有点久了，198几年的书，所以我想问问 这样的看法是否正确?到现在有没有更进一步的研究结果? 谢谢 --

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