2015大学英语四级作文天天练：大脑和计算机思维导图

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2015大学英语四级作文天天练：大脑和计算机思维导图

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　　12. The Brain and the Computer 　　Some recent developments in the computer industry make scientists predict that the gap between human beings and machines will be closed about t

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12.TheBrainandtheComputer

Somerecentdevelopmentsinthecomputerindustrymakescientistspredictthatthegapbetweenhumanbeingsandmachineswillbeclosedabouttheyear20000.

Tounderstandthesignificanceofthispredictionletuscomparethehumanbrainwithexistingcomputers.Thebrainconsumeselectricalenergyattherateof25wattsandoccupiesavolumeofonetenthofacubicfoot.Thebrainhousesbetween10billionand100billionitemsofinformation.Everybraincellisdirectlyconnectedtomanyothercells.Asaresult,thecellsinwhichinformationisstoredcancommunicatewiththousandsofothercells.

However,thecomputerconsumes1000,000wattsofelectricalpowerandoccupieshundredsofcubicfeetofspace.Itsmillionitemsofimmediatelyaccessibleinformation.Incontrast,thecomputermemoryislikeacellofpigeonholes,withnothinkingcapacityandnoconnectionselsewhere.

Inaword,theelectronicbrainsarehopelesslyinadequateincomparisonwiththehumanbrains.

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