The effect, in the words of one surgeon, was the creation of "two separate spheres of consciousness".(註: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. 以上是這位哲學家的書中的一段，第一句是他說有一位外科醫生所提出的對這個手術 的結論:'產生兩個不同領域的意識'。(這個外科醫生是Sperry?) 第二、三段是他認為有些心理實驗證明此事，以及他自己提出的這些心理實驗的簡化版本 (依照他對這個手術結果的理解)。 請問各位大大這樣的理解是否恰當?但是這本書有點久了，198幾年的書，所以我想問問 這樣的看法是否正確?到現在有沒有更進一步的研究結果? 謝謝 --

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