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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,excitationthreshold,andt
2、helikeashadbeendemonstratedinnervecellsremainednegligibleinsignificanceforanypossiblecorrelationwiththemanifolddimensionsofmentalexperience. Neartheturnofthecentury,ithadbeensuggestedbyHeringthatdifferentmodesofsensation,suchaspain,tasteandcolor,mightbecorrelatedwiththedi
3、schargeofspecifickindsofnervousenergy,However,subsequentlydevelopedmethodsofrecordingandanalyzingnervepotentialsfailedtorevealanysuchqualitativediversity.Itwaspossibletodemonstratebyothermethodsrefinedstructuraldifferencesamongneurontypes;however,proofwaslackingthatthequal
4、ityoftheimpulseoritsconductionwasinfluencedbythesedifferences,whichseemedinsteadtoinfluencethedevelopmentalpatterningoftheneuralcircuits.Althoughqualitativevarianceamongnerverigidlydisproved,thedoctrinewasgenerallyabandonedinfavoroftheopposingview,namely,thatnerveimpulsesa
5、reessentiallyhomogeneousinqualityandaretransmittedas“commoncurrency”throughoutthenervoussystem.Accordingtothistheory,itisnotthequalityofthesensorynerveimpulsesthatdeterminesthediverseconscioussensationstheyproduce,but,rather,thedifferentareasofthebrainintowhichtheydischarg
6、e,andthereissomeevidenceforthisview.Inoneexperiment,whenanelectricstimuluswasappliedtoagivensensoryfieldofthecerebralcortexofaconscioushumansubject,itproducedasensationoftheappropriatemodalityforthatparticularlocus,thatis,avisualsensationfromthevisualcortex,anauditorysensa
7、tionfromtheauditorycortex,andsoon.Otherexperimentsrevealedslightvariationsinthesize,number,arrangement,andinterconnectionofthenervecells,butasforaspsychoneuralcorrelationswereconcerned,theobvioussimilaritiesofthesesensoryfieldstoeachotherseemedmuchmoreremarkablethananyofth
8、eminutedifferences.However,corticalasdiverseasthoseofred,black,greenandwhite,ortouch,cold
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