The difference between a brain and a computer can be expressed in a single word, that is, complexity. The large mammalian

　　brain is the most complicated thing, for its size, known to us. The human brain weights 3 ponds, but in that 3 ponds are 10 billion neurons and a hundred billion smaller cells.// Even the most complicated computer man has yet built can't compare in intricacy

　　with the brain. Computer switches and components 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.// It is frequently said that computers solve problems only because they are “programmed” to do so. They can only do what men have them do. One must remember that human beings also can only do what they are “programmed” to do. Our genes “program” us and our potentialities are limited by that “program”.// Our “program” is so much more enormously complex, though, that we might like to define “thinking” in terms of our creativity in literature, art, science and technology. In that sense, computers certainly can't think.//

　　大腦與電腦的差別可以用“復(fù)雜性”這三個(gè)字來表明。哺乳動(dòng)物碩大的腦子就其體積而言是我們所知道的最為復(fù)雜的東西。人腦的重量為3磅，而這3磅卻包含著100億個(gè)神經(jīng)元和1000億個(gè)更小的細(xì)胞。//就復(fù)雜性而言，世界上已生產(chǎn)出的最為復(fù)雜的電腦也無法與大腦的復(fù)雜性相提并論。電腦的開關(guān)和元件充其量只要數(shù)千個(gè)，而不是數(shù)千億個(gè)。此外，電腦開關(guān)只是億個(gè)離合裝置，而大腦細(xì)胞卻有著極其復(fù)雜的內(nèi)部結(jié)構(gòu)。//我們經(jīng)常聽到人們說，電腦處理問題是因?yàn)殡娔X設(shè)有能讓其處理問題的程序，它們只能按人的指令行事。我們應(yīng)該知道，人類也設(shè)有程序。我們的基因給我們編寫了程序，我們的所作所為無不受制于這個(gè)“程序”。//我們大腦的程序極其復(fù)雜，我們或許可以從人類的文學(xué)、藝術(shù)、科學(xué)和技術(shù)上的創(chuàng)造力這些角度給“思考”下定義。從這個(gè)意義上說，電腦肯定無法思考。//