ItstartedingraduateschoolatHopkinswhen I reallybecamemostinterestedinpersonalityresearch, and I startedoutthat I wasstudyingindividualdifferencesinpersonality.
Butjustbyhappenstance.
Theyear I startedgraduateschoolin 1971 wastheyearoneoftheprofessorsthere.
JulianStanleywas a studyofmathematicallyprecociousyouth, and I wasoneoftheproctorsattheveryfirsttalentsearchformathematicallyprecociouskids.
And I wantmyfirstcoupleofpapersasbookchaptersinbooksthatStanleywasanythingaboutthisproject, and I sawthesetheskidsage 10 11 12 whowerescoringhideron S a T maththanHopkinsfreshen.
Andthequestionwas, Howdoesthishappen?
Wheredoesthiscomefrom?
Sonowit's kindofmyearliestinterestandingraduateschool, although I reallycompletedmydissertationonpersonality.
Uh, I tookmyfirstjobattheNationalInstituteofLittleHealthinliteralresearchprograminthelaboratoryofpsychologyandpsychopathology, whichatthetime, thelabdirectorwasDavidRosenthal, whohadjustfinishedtheDenmarkadoptionstudies.
Thatschizophrenia, right?
Right.
Andhereiswhere I learnedaboutgenetics.
MyofficewasnextdoortoahFallon, a Monteboxponwhowasdoingwholepotentialsearch.
Veryinterestedinthat.
Andsomymyearlyinterestedinintheindividualdifferencesslowlymorphedintouninterestedinindividualdifferencesinintelligenceandat n i am H theywerejustgoingthrough a transitionfromkindof a psychoanalytic, uh, orientationto a neuroscienceorientation.
Nowyoujustwrote a booktoo, Andtheneuroscienceofintelligence.
KantoUniversityPress.
Andsowhendidthatcomeout?
Thatcameout?
Um, really, justaboutsixmonthsago.
Soitcameout, I think, inDecemberof 2016.
Buttheytellmeforpublishingreasonstheycallit a 2017 publication.
Andsee, while I'm partofthereason I wassoexcitedtotalktoyouisthat I'vedone a verylargeamountofresearch, especiallynotsomuchpracticallabresearchbutinvestigationintothestructureofintelligenceandintoitsmeasurement.
Wedesignedbackin 93 with a studentofmine, DanielHiggins.
Sohypothetically, thehighestordercognitivefunctionsinthebrainandwefoundmuchtoourchagrin, I wouldsay, Andthiswas a verypainfuldiscoverythat, ah, lotofwhatwehavebeenthinkingaboutitispotentiallyseparable, neuropsychologicalfunctions.
Soitwasquite a shock, especiallybecausetheneuropsychologistsofthetimeandtheystilldothisareareasassiduousininvestigatorsofthe A psychometricintelligenceliteratureistheyshouldbeintent.
Underestimatethecentralpowerofthat.
Thatinitialfactor.
So, anyways, I'm reallyinterestedintointelligenceresearchPartyfrom a practicalperspective, too, becausetheindustrialorganizationalpsychologyliteratureiscrystalclearforcomplexjobs.
Thebestpredictoroflongtermsuccessisintelligence, andit's a predictorthat's probablysay, imagineyougiveninourofpointfor 2.5, whichisprettydecent.
So, let's say 25% ofthevariancethenextbestpredictorsconscientiousness.
So, likeyou, it's a killerman, anditwe I makesuremystudentsassessintelligencewitheverythingtheydo, anditalwaysendsupbeing a majorpredictorofthingsthatyouwouldn't evenexpect.
Disgust, sensitivityforexamplesoveryourdisgustsensitivityishigherifyouhave a lower I.
Q.
Yeah, the G factorispowerful.
Youjustsaidsomethingthat I wanttojustmake a distinctionabout.
You'retalkingaboutthe G factor, andthenyoukindofcallthat I Q.
Thisisverycommonineverydaylanguagetotalkaboutintelligence I Q andwhatwecalltheJulieFactorasonething.
Anditreallyisn't sowhen I Q scoreis a goodestimateofthe G factor, right?
Alsoincludesotheraspectsofintelligenceandintelligenceisitself a littleis a bloggerTrot, um, isonly a partofftheuniverseofmentalabilities.
ButthisideaofcompensatoryeducationreallytookoffAndthen, in 1969 theHarvardEducationwillreviewaskedoneoftheforemosteducationalpsychologist, ArthurJensen, towrite a reviewoftheProgress.
Thedifferenceshavedisappearedcompletely, sotherewasnoevidencewhatsoeverofthatofthateitherof a stable, onetimelongtermgainincognitiveability, orwhatpeoplewerereallyhopingwasthatifyouinterveneearlyenough, yougetsomethingthatwouldsortofhutwouldturninto a positivefeedbackloop, andthegainswouldactuallyadvanceacrosstime.
Sothatwas a reallytremendousdisappointmentbecauseitwas a bipartisanattempttocometogripswiththefundamentalissuesthatsortofbedeviledstructuralpovertyintheUnitedStates.
Noonewashappyaboutthatoutcome.
I couldtellyouthemodelthat.
ButwhenJensenpublishedhisarticle, healsosaidthatsince I Q.
Increasesseemnottobecomingfrommusic.
Intenseenvironmentalinterventions.
Weshouldconsiderthepossibilitythatpiecedifferenceshave a dramaticcomponentandthatreallybeganincendiarydescentofintelligencesearchtotheperiphery.
Andsothatdidn't workoutsowell, liberalsandthenontheconservativeside, theideais, Well, ifyoucouldjustgetoffyourlazyassisandget a job, thereis a jobforyououtthere, Andthetruthofthematteris, youknowyoucantellmewhatyouthinkaboutthis, butthisis a statisticthatjustabsolutelyshockedandstaggeredmewhen I wentthroughtheintelligenceliterature.
Soyouknow, itisillegalintheUnitedStatestoinductanybodywhohasNikeoflaceand 83 andThereasonforthatisyouknowthattheAmericanArmedforceshavebeanconductingintelligenceresearchfor, like, morethan 100 years, andthatwaspartlybecausetheyneeded a wayofsortingpeoplerapidlyduringtimesofmilitaryexpansionduringmoretime.
Butitwasalsobecause I Q tests, andespeciallyintheearlypartofthe 20thcentury, wereusedtoidentify, let's say, thedeservingpoorwhocouldreallybenefitfromadditionaleducationalattainmentandadvancementintheunion.
Andthemilitarywashopingtoidentifypeoplefromnorclassstratathatcouldbestreamedinto, say, officertrainingprograms, andsofourorevenskillstrainingprogramstotomovepeoplefromtheunderclassintoatleasttheworkingclassandmaybeabovesothat a bloodystakeinthisman, theywantedtofindpeople.
Theywantedtosortthemproperly, andtheywantedtodosocialgoodwhentheyweren't justtryingtowin a war.
Let's saywhichoftenalsois a socialgood, butwhathappenedwasthatby I don't rememberwhenthislegislationwasintroduced, butitwasn't.
Itwasinthelaterpartofthe 20thcentury.
Buttheirbasicfindingwasthat, bysay, the 19 eighties, theyhaddeterminedthatifyouhadan I Q oflessthan 83 therewasnot a damnthingthatthethattheArmycoulddothearmedforcescoulddototransformyouintosomeonewhocoulddosomethingthatwasmoreproductivethannonproductiveandthetear.
A terriblethingaboutthatisthatit's about 10% ofthepopulation.
Andsoyoulook a statisticlikethatandyouthink, OhmyGod, you'vegotthisThisthisisenterprise, thismassiveenterprisethat's chronicallyhungryforpeople, Trade's alwaysthey'realwayslookingforpeople.
It's like, yeah, youknow, intheUnitedStates, wehaveabout 330 millionpeopleandbecauseofthedistributionrelativelynormaldistributionof I Q scores, about 16% haveIQ's of 85 orwet, right?
RightJews.
They'renotgoingtograduateschool.
No, itmeansthatfromfromwhat I'veread, practically, itmeanstheWonderliccompanyhasactuallydone a Really, theyhave a nice I Q testsfromthecommercialperspective.
Youknow, it's actuallyPsychometricLeevalid, andthey'velate I Q levelsThiojobspecificallytojobcategories, youknow, I knownotandthat a lotofconcerns.
They'renotonlynotgoingtograduateschool, they'renotgonnafind a a stablejobthatpays a livablewage.
SojustpeoplehaveSee, I'm a clinicalpsychologistand I'vedealtwithpeoplehad I rangesintheloweightiesandtriedtofindthemdrugsandtriedtotrainthem.
And I havesomerealknowledgeaboutthestunninggapbetweenpeopleatthelowendoftheikeydistributioninthehighend.
Andit's it's nobloodywonderpeoplehateIkeresearchandintelligenceresearchbecauseitreveals a setofseriouslydismalfactsoftheincrediblerangeofabilityamonghumanbeings.
Yes, thistles.
True, andmoreover, I wouldaddtothisthatpeopleinuniversities, thefastenersandcuttinggraduatestudents, uh, have a hardtimeunderstandingwhatthewhateverydaylifeislike.
Ifyouhavean I Q of 85 andyou'remakingyourway, you'relivingindependently.
You'remakingyourwayintheworld.
Butitis a challenge.
Is a right?
I mean, justtell, justbarelybeginstodescribeit.
I had a I had a clientwhoheprobablyhadnine q ofunder 80 thenonverbalportionofitanyways.
AndheywasindistinguishableinphysicalappearancefromfromLet's say, I hatetousedtheframenormalperson, butthere's nothingMarkthatmarkedhimoutaboutparticularlyintellectuallyimpaired, youknow.
And, uh, I triedatonepoint.
I thinkthisisThisisthiswasso, sotellingtome.
I gothimoninto a volunteerjob, which, bytheway, isverydifficult.
It's hardertoget a volunteerjobthan a realjobbecauseyouhavetodopolicescreeninginallsortsofthings, andtheselectionprocessisjusthisextreme.
But I eventuallyendedupgivinghim a jobin a bikestore, bikeslashbookstore, andatthatplacecouldn't holdhimoncethesubstituteprogramhadexpired.
Andthen I gothim a jobat a charity, andhisjobwastofoldlettersintothreesothattheycouldbeputintoenvelopes.
Well, thatsoundseasy.
Accepted.
Healsohad a bitof a motortremor, and, youknow, ittookmeabout 30 hourstotrainhimtofoldup a pieceofpaperwithsufficientprecisionsothatitcouldbeputinanenveloperapidlysothattheenvelopewasn't somangledthatitwouldgetstuckintheautomaticsortingmachine.
Andanotherishighperformancedemandsonhim, too.
Hehadtowhipthroughthoselettersprettyquickly, andthensometimestheletterswouldhave a photographappendedtothemthatwasstapledon, andtheyweren't alwaysstapledoninthesameplace.
Butthebiggesteffectbyfarwefound, wastheproclivityofofwomeningeneraltorapemenaslessattractiveasthewomen's I Q increased.
Andsotheotherthingthatwedon't knowiswhatpricewepayforforaccelerated I Q from A from a broaderperspective, youknow, because I knowthattherewassomeevidenceandyoutellmewhatyouthinkaboutthisbecause I knowthatthere's reasonableevidencethattheaverage I q oftheAshkenaziJewishpopulationisabout 15 pointshigherthanthethestandardpopulation, whichiskindofmakesit a thoughtexperimentthatexperimentreallifeexperiment.
It's equivalenttotheonethatyoulaidoutbutaskingnosyJewsalsotendtosufferfrom a hostofneurologicaldiseasesthatseemtobeassociatedwithincreasedneuralplasticity.
Andso, tome, it's oftenit's oftenhardtogainononefrontwithoutlosingonanother.
Youknow, I mean, that's theevolutionaryconundrum, obviously, butwecallthatthesocialjustice.
Yougetsomethingthat's roughlyequivalentthereto a G factor.
It's roughlythat.
Sojust I wouldsayit a littlebitdifferently, justCapeforever.
It's onthesamepageifyouthinkofallthedifferentmentalabilitiesandyoudevise a testforeachoneofthem, andyougavethistestwith a lotofpeopleacrosstherangeofability, whatyou'llfindisthescoresonallthosetestsarepositivelycorrelatedwitheachother, suggestingthatalltestsofmentalabilityhavesomethingincommon.
Right?
Sure, that's a greatcop.
Isthis G factorthisgeneralabilitytoreason?
Andsomeindividualtestshavemore G loadingthanotherindividualtests, right?
Soit's andtestsofabstractreasoningtendtobehighly g loaded.
If I saidtoyou, repeatthefollowingnumbersbacktome.
372165 That's thenot a veryhighly G loadedmentalabilitytobeabletodothat.
Butif I gaveyou a stringlikethatandsaid, Repeathimtomebackwards, thatbecomes a geneloadedabilitybecausetransformation.
That's thethingisthatthatgeneralfactornotonlyexistsacrossdomainsofcognitiveability, butittendstoaccountfor a substantialamountoftheoftheabilityineachofthosedomains.
It's kindoflikeourgroggyiskindoflike a blackholeforintelligenceresearch, andeverythingkeepsfallingintoit.
That's aninterestingwaytoputit, becausenowwehavetheseJuvenilewideassociationstudiesthatarefindingthesebitsof D N A thatarerelatedto a latentfactorofintelligence, whichisthe G factor, ortowhattheycalleducationalattainmentvariableswhereithits.
Theattainmentissohighlycorrelatedwith I Cube, that's essentiallythesamething.
Sowe'rereallymovingwell.
When I wasingraduateschool, thequestionwas, Isthere a geneticcomponenttointelligenceornottothiskindof d n a analysistryingtofindbitsof d n A.
That I'm goingtoberelatedtowhatwecallintelligenceor I q testingorforthe G factor, andtheyseemtoexist.
Thereseemstobehundredsofthem.
A tinyeffect, uh, whichwillmaketheultimatestoryextremelycomplicated.
Butas I saidbefore, I thinkit's a finitesetofproblems, right, rightattheendofthatsequenceofsolvingthoseproblems, I thinkthere's a goodchancewillknowhowtoincrease I Q.
And I thinkit's a goodthingtobeabletodothat.
Youknow, I havesaidpubliclythatmoreintelligenceisbetterthanless.
Sometimes I getcriticizedbecausethatimpliesthatpeoplewithlessintelligencearen't usboth.
Whilethat's why I wanttobeverycarefulthat I don't believethatthatmartyrlife's ismoretheaccuratewayofthinkingaboutit.
Andthereliesin a narrowrangeofpossibilitiesandopportunities.
That's right, andinmyview, mypoliticalbiasistherefore, governmentshave a moralresponsibilitytohelpthosepeopleandand, uh a lotofgovernmentprogramsaregonnadoitbecauseyourjobtrainingrequires a certainlevel G onlikemylow I Q clients.
And I thinkitwastheHornstein, herEinsteinandMurray.
I thinkthatthecalculationsbackinthebellcurvethatindicatedthatifyouimaginethatyoucouldyouare a fairygodmotherandandyouhave, ah, yournewborngrandchildinfrontofyouandyoucangrantthemthreestandarddeviationsabovethemeanintermsofwealthatbirth.
Oryoucouldgrantthemthreestandarddeviationsabovethemeanintermsof I Q.
Trump's wealthtryingifitsabilitytopredict a positivefutureYes, yeah, andthatthat's why I'm sointerestedintheconceptofincreasingcuteorincreasingthe G factor, notjustthe I Q.
I mean, thepointofthis, thepointofnoneuroscienceresearchonintelligenceandwhat I hopetoachievebywritingthebookwastoshowthatthatthegeneticaspectsarenotdeterministic.
Yeah, becausepeopledotendtothinkaboutbiologicalfactorsisdeterministicandthatthat's a mistakebecausetheycanbeshifted.
Sowithregardstotheanimalstudies.
Soyouknow, youpointedoutthatyoucanyoucancomeupwithan I Q likeestimatefor, say, a rat.
Andhaveyouseenanythingthatindicates I don't carehowit's donethroughtrainingororNerochemicallyororbyBypromotingbrainfunctionindifferentways, however, youmightdoit.
That's actuallyindicatedtoyouthatthereis a wayofbiologicallyenhancingthegeneralcognitiveabilityevenofananimalHasanythingofsomeofcredibleJustbybreedingmyselfrun a mazefasterthanothermicetogether, yougetmyselfsimplybeabletolearnhowtorun a mazefaster.
Butthat's workfromthe 19 eighties, right?
I reviewthisinthebook.
Therearesomeinterestingtechnologiesthathavebeendevelopedwhereyoucanturnpartsof a ratbrainonandoffandwillandseewhathappens.
Thishasnotyetbeenappliedasfaras I knowtoelearning, butinterestingly, therearehumanstudiesunderwaywiththingsliketranscranialmagneticstimulationandelectricalwastedlowvoltagewaystostimulatepartsofthebrain.
It's moreanecdotal, butthere's a bitofresearchbeingusedtotreatdepression.
Forexample.
That's right.
And I docoverhiminthebook, thestudiesthatwerepublishedupuntilthetime I wrotethebookandcautionpeoplethattheyhadn't beenreplicatedyet.
Right, right, right, we'reontheway.
I mean, thisisThisisanevolvingareathat's goingtobeveryexcitingunderthatstudentsarelisteningtothispodcast, andwe'rethinkingaboutneuroscienceorpsychology.
Thiskindofexperimentis, isisreally a newthingsofintelligenceresearchwhereyoucandoexperimentsonhumanbeingsthatarecompletelyethicalondhe, relativelynonintrusiveonthisisgoingreallygonnachangeeverythingbecauseit'llshiftintelligenceresearchfrombasicallypsychometriccorrelationspastwhatneuroimaginghasdone, which, whichreallymoveditawayfromjustcyclemetricsandthencorrelatedpsychometricscoreswithmeasurableaspectsofthebrain, likeglucose, metabolicfunctionoftheamountofgraymatterorwhitematterornumberoffwhitematterfibers.
Andwithallthesefabulousconnections, right, movethings I gotinearlyonthatphase.
I mean, I lookedfor a whilebecause I'm veryinterestedinimprovinghumanperformance, measuringitandimprovingit.
And, uhso I lookedandanddoingthatalsoinconjunctionwithbusinesses, because I likethingstohave a practicaland, youknow, I looktofindoutwhattheresearchindicatedwithregardstoimprovementofintelligence.
Andmostlywhat I foundwasnotsomuchimprovementasconservationisthatifyouexercisebothaerobicallyendandwithweightliftingthatthatcanhelpyoumaintainyourfluidintelligenceacrossforlongeracrossyourlifespanbecauseittendstodeclineratherprecipitouslyasyouage.
Well, aswelikeyouseemstobequitemetightly, tightlylinkedtoWell, thisisanotherthingwecouldtalkaboutbecauseso I knowthattherearecertainbiologicalmarkersthat I Q islooselyassociatedwith.
So, youknow, it's fragmentitpredictsin a fragmentarymatter.
So I knowthatevensomethingassimple a simplereactiontime, howfastyoucanpush a buttonwhenlightcomesoniscorrelatedwith I Q.
Withfluidintelligenceandabout 0.2.
And, um, having a biggerheadisslightlycorrelated, especiallywhenyoucorrectfrombodysize.
Gladyouaskedthisbecauseas I wasfinishingthemanuscriptforthebookliterally.
Thedayafter I turneditin, I hadtoaskforitbackbecausetherewasthisveryinterestingstudypublishedby a groupatYalethathasused a fairlysophisticatedladytoelookatwhitematterconnections, functionalstructuralWhitematterconnectionsandfunctionalconnectionsinthebrain, anddetermininghowonebrainareaisfunctionallyorstructuringstructurallyrelatedtoallotherbrainareas.
Andyoucanputup a mapof a person's brainthatshowsfrombrainimagingfrom M I technologyhowtheirbrainisinterconnected, thispapersaid.
Theseinterconnectionsaresoreliablewithin a personthatthey'relikefingerprints.
Structurally, howmuchwhitematterconnectsthisareatothatarea, youknow, andtherearecertainbrainareaswhereyouhave a lotofwhitemattercominginand a lotofwhitemattergoingouttootherpartsofthebrain.
Thereweremoreontheleftandontheright, buttherewerealsoareasontheright, a czwell, andtheseareastendtobeareasthatarealsorelatedto, uh, languageandmemoryand a touch.
Butifyoulookattheseelementalconstantsoftasks, youcanextracted a Jewfactorofcognition, whichishificorrelatedwith a psychometric.
G factorsshouldabilitiesmorethanattentionMemoryaspectsofmemoryaremorecorrelatedtothe G factor.
Processingspeediscorrelated, right?
Sure, andattentionisalsocorrelated.
So, youknow, I kindofhavethisideafrombeing a parent, watchingmykidsgrowup, thatpeopledifferintheirbaselineoffattentionwhenthey'renotspecificallypayingattention.
Thismightbecalledconsciousness.
Soyouhavetwokidswalkingthrough a museumforanhourandyoucomeoutandyousaythekidone.
Sowhatdidyousee?
Andyougot a wholelongthing.
Andyes, theothercable, whatdidyouseethere?
Andyouget a muchlessrichexplanation.
Yeah, off.
Whatit I'vealwaysthoughtaboutthatis a differenceinresolutionofworlds.