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1、2012高考英语：阅读理解课堂练学案（30）（结束）PassageThirty-four(TheRelationshipbetweenBrainProcesswithMentalExperience) By1950,theresultsofattemptstorelatebrainprocessestomentalexperienceappearedratherdiscouraging.Suchvariationsinsize,shape,chemistry,conductionspeed,excitationthr
2、eshold,andthelikeashadbeendemonstratedinnervecellsremainednegligibleinsignificanceforanypossiblecorrelationwiththemanifolddimensionsofmentalexperience. Neartheturnofthecentury,ithadbeensuggestedbyHeringthatdifferentmodesofsensation,suchaspain,tasteandcolor,migh
3、tbecorrelatedwiththedischargeofspecifickindsofnervousenergy,However,subsequentlydevelopedmethodsofrecordingandanalyzingnervepotentialsfailedtorevealanysuchqualitativediversity.Itwaspossibletodemonstratebyothermethodsrefinedstructuraldifferencesamongneurontypes;h
4、owever,proofwaslackingthatthequalityoftheimpulseoritsconductionwasinfluencedbythesedifferences,whichseemedinsteadtoinfluencethedevelopmentalpatterningoftheneuralcircuits.Althoughqualitativevarianceamongnerverigidlydisproved,thedoctrinewasgenerallyabandonedinfavo
5、roftheopposingview,namely,thatnerveimpulsesareessentiallyhomogeneousinqualityandaretransmittedas“commoncurrency”throughoutthenervoussystem.Accordingtothistheory,itisnotthequalityofthesensorynerveimpulsesthatdeterminesthediverseconscioussensationstheyproduce,but,
6、rather,thedifferentareasofthebrainintowhichtheydischarge,andthereissomeevidenceforthisview.Inoneexperiment,whenanelectricstimuluswasappliedtoagivensensoryfieldofthecerebralcortexofaconscioushumansubject,itproducedasensationoftheappropriatemodalityforthatparticul
7、arlocus,thatis,avisualsensationfromthevisualcortex,anauditorysensationfromtheauditorycortex,andsoon.Otherexperimentsrevealedslightvariationsinthesize,number,arrangement,andinterconnectionofthenervecells,butasforaspsychoneuralcorrelationswereconcerned,theobviouss
8、imilaritiesofthesesensoryfieldstoeachotherseemedmuchmoreremarkablethananyoftheminutedifferences.However,corticalasdiverseasthoseofred,black,greenandwhite,ortouch,cold
