... 4.2Page43alternatives.Whenonemodelsreceptivityasaconnection,thereceptiveconnectiondoestheworkofthecausalconnection,andcausationemergesbydetailingtheconditionsunderwhichthisconnectionmightbindtwoormoreeffectivestates.Modelingreceptivityinthewaydescribedaboveyieldsseveralimportantexplanatorybenefits.Amongtheseare,1)Itenablesthetheorytosidestepquestionsaboutaddingfurtherconditionsfordecidingwhenanindividualisreceptivetoanotherindividual(e.g.,spatiotemporalcontiguity)overandabovesharingareceptiveconnection.Thisallowsittotakeasimplerformbymakingfewerassumptionsattheoutset,andultimatelymakesitmorecompatiblewithmodernphysics.2)Ityieldsasimpleinductivedefinitionofnaturalindividuationthatenablesthetheorytoelegantlymodellevelsofnature,wherethoselevelseachcontainirreducibleindividualswithirreducibleaspects.Thedefinitionisasfollows:anindividualisanaturalindividualIFFBasecase:Itisaninstanceofabasiceffectiveproperty.Inductivecase:Itisasetofnaturalindividualsthatshareacommonreceptiveconnection.3)Ityieldsatopologytothecausalmeshthatincreasestheexplanatorypowerofthetheorybyallowingforareductionofthefactsaboutspacetimetofactsaboutcausalconnectionandcausalsignificance.4)Ityieldsastructureforthecausalnexusthattiesintothehypothesisthatconsciousnessisacarrierforcausalcontent,anddoessoatadeepanddetailedlevel.Itis,finally,amistaketothinkthatwecanknowthat"zombies"couldexist—wherezombiesareunderstoodtobecreaturesthathavenoexperientialpropertiesalthoughtheyare ... purelyonthebasisofcompetencywiththerelevantconcepts)ordescriptionsofunderlyingmicrophysicalphenomena.Nosuchderivationof(8)ispossible.Thusthedifferencebetweenthetwocasesisthis.Inthecaseofwater,thecrucialbridgepremiseisitselfsusceptibleofexplanation,whereasthisisnotthecasewithqualia.Letmeelaborate.Onthisaccount,statement(5)canbederivedinsomethinglikethefollowingmanner:(i)Wateristhestuffthatmanifeststhe"watery"properties(ii)H2Omanifeststhe"watery"properties(5)WaterisH2OBythe"wateryproperties"Imeanwhateversuperficialpropertiestheyarebywhichwenormallyidentifywater(e.g.,liquidityatroomtemperature,beinglocatedinlakesandoceans,fallingfromthesky,etc.).Therearetwocrucialfeaturesofpremise(i)thatareresponsibleforthisderivationconstitutinganadequateexplanationof(5):itisanalytic,and"watery"isultimatelycharacterizablein"topic-neutral"terms.mentalpropertiesaremetaphysicallyirreducibletophysicalproperties,stilltheydodemonstratethatwelackanexplanationofthementalintermsofthephysical.Theideaisthis.Itseemsconceivablethattherecouldbeacreaturephysicallylikeus(orfunctionallylikeus)andyetforwhichthereisnothingitisliketobethiscreature;or,forwhomsensorystatesareverydifferentfromwhattheyarelikeforus.Ifwereallyunderstoodwhatitisaboutourphysical,orfunctionalstructurethatisresponsibleforoursensorystatesbeinglikewhatthey'relike(orbeinglikeanythingatall),thenitwouldnolongerbeconceivablethatsuchacreaturecouldexist.Thuswhattheconceivabilityargumentdemonstratesistheexistenceofanexplanatorygapbetweenthementalandthephysical.3InthischapterIwanttoconsideranobjectiontotheexplanatorygapargument.Accordingtotheobjection,thereisnoexplanatorygapbecausethephenomenonthatPage4isallegedlylackinganexplanationisnotreallyapropercandidateforexplanation.Inordertopresenttheobjection,Iwillfirstneedtopresenttheoriginalexplanatorygapargumentinalittledetail.Afterpresentingtheobjection,I'llarguethatitdoesn'tsucceedinremovingtheproblem.Finally,I'llbrieflyexploretheimplicationsofmyreplytotheobjectionforthemetaphysicalquestionconcerningtheactualidentityofmentalpropertieswithphysical(orfunctional)properties.1—WaterVs.QualiaOnewaytoappreciatetheexplanatorygapistocontrastthecaseofexplainingtheexistenceofvarioussensoryqualia(e.g.,thewaypainfeels,orthewayredthingslook)intermsofunderlyingphysical(orcomputational)processeswiththecaseofexplainingothermacrophenomenaintermsofunderlyingmicrophysicalprocesses.So,forinstance,let'scomparehowweexplaintheboilingpointofwateratsealevelwithhowwemightexplainthereddishcharacterofcertainvisualsensations.Considerthen,thefollowingtwoexplanationsketches:ESI:BoilingPointofWater(1)H2OmoleculesexertvaporpressurePatkineticenergyE(2)AtsealevelexertingvaporpressurePcausesmoleculestorapidlyescapeintoair(3)Rapidlyescapingintoairisboiling(4)212°F.iskineticenergyE(5)WaterisH2O(6)Waterboilsat212°F.atsealevelESII:PresenceofReddishQualiaC.LarryHardinDepartmentofPhilosophySyracuseUniversitySyracuse,NY13244CharlesA.HeywoodDepartmentofPsychologyScienceLaboratoriesSouthRoad,Durham,DH13LE,UKMasayukiHirafujiComputationalModelingLabDept.ofInformationScience,N .A. R.C.3-1-1Kannondai,Tsukuba,Ibaraki,305JapanPagexviNicholasHumphreyDepartmentofPsychologyNewSchoolforSocialResearch65FifthAvenueNewYork,NY10003HarryT.HuntDepartmentofPsychologyBrockUniversitySt.Catherines,OntarioL2S 3A1 CanadaPietHutInstituteforAdvancedStudyOldenLanePrinceton,NJ08540AlfredW.KaszniakDepartmentsofPsychologyandPsychiatryTheUniversityofArizonaTucson,AZ85721RobertW.KentridgeDepartmentofPsychologyScienceLaboratoriesSouthRoad,Durham,DH13LE,UKStanleyA.KleinVisionScienceUniversityofCalifornia,Berkeley ... Tomakethestrategywork,themotivationforintroducingtheseextrafactsshouldbeindependentofthemind-bodyproblem.Otherwisethetheoryislikelytoseem—andprobablybe—indulgent,andwillcompetepoorlyinthemarketplaceofideas.Thesecondchallengeistoavoidthedualistdilemma.Whateverfactsoneintroducesmustbetiedtothephysicalfactsinawaythatdoesnotmakethemcausallyirrelevent,orspookilyinteractive.Thethirdchallengeistoberelevanttotheexplanatorygap.Thetheorymustgivereasonswhythesefurtherfactsaboutthephysical,whoseexistenceonehasindependentreasontobelievein,mayfilltheexplanatorygapbetweenthephysicalandphenomenalfacts.III—ThePhysicsof...