The Difference between a Brain and a Computer
The difference between a brain and a computer can be expressed in a single word: complexity.
Even the most complicated computer man has yet built can't compare in intricacy with the brain. Computer switches and comportents number in the thousands rather than in the billions.What's more, the computer switch is just an on-off device,whereas the brain cell is itself possessed of a tremendously complex inner structure.
Can a computer think? That depends on what you mean by"think". If solving a mathematical problem is"thinking',then a computer can"think'and do so much faster than a man. Of course, most mathematical problems can be solved quite mechanically by repeating certain straightforward processes over and over again. Even the simple computers of today can be geared for that.
Surely, though, if a computer can be made complex enough, it can be as creative as we are. If it could be made as complex as a human brain, it could be the equivalent of a human brain and do whatever a human brain can do.
But how long will it take to build a computer complex enough to duplicate the human brain? Perhaps not as long as some think. Long before we approach a computer as complex as our brain, we will perhaps build a computer that is at least complex enough to design another computer more complex than itself. This more complex computer could design one still more complex and so on and so on and so on.
In other words, once we pass a certain critical point, the computers take over and there is a"complexity explosion". In a very short time thereafter, computers may exist that not only duplicate the human brain--but far surpass it.
人腦與電腦的區別
要形容人腦與電腦的區別只需一個詞，即：複雜。
即使是迄今為止人類制造出的最複雜的電腦如果與人腦的複雜相比也望塵莫及。電腦轉換組合出的數字只有千百萬種而不是千百億。更重要的是，電腦的轉換器只是一個開關裝置，而大腦細胞本身就具有極其複雜的內部結構。
電腦會「思考」嗎?這就要看你所說的「思考」是指什麼了。如果解一道數學題是「思考」，那麼電腦會「思考」，而且比人腦快得多。當然，絕大多數數學題都可以通過一遍一遍機械地重複簡單的程序而得到解決。即使是現今簡單的計算機也能做到這點。
然而，電腦如果能造得夠複雜，它也能和我們一樣富於創造力。如果它能造得同人腦一樣複雜，它便能與人腦相媲美，並能做到人腦能做到的一切。
但是，要造出一個與人腦一樣複雜的電腦要花多長時間呢?或許不會像有些人想象的那麼長。在造出與人腦一樣複雜的電腦之前，我們也許可能要先造出一個電腦，它複雜得至少能設計出比它本身更複雜的電腦。那個更複雜的電腦又能再設計出比自己更複雜的電腦，如此反複。
換言之，我們一旦突破了某個極點，電腦將盛行起來，並導致「複雜性爆炸」。不久，電腦將不僅複制人腦，而且將遠遠超越人腦。
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