psyphilprog - neward & associates · reasons in some cases, we are misled by supposed experts...
TRANSCRIPT
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WhoamI?
TedNeward,"ComputationalPhilosopher"– thismeansIliketowrestlewithreallyinteresting/hardquestionsthatoftenhavenoanswers,andevenmoreoftencreatemorequestions•theactualitiesofartificialintelligence•interviewprocesses•howtomanagedevelopers
– IlookforanswersintheLiberalArtshistory,psychology,economicsandparticularlyphilosophy
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Architecture
Whatdefinesthedifferencebetweenthesetwobuildings?– goals– scope– complexity– materials– process– …?
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Objectives
Programmingisanextremelyephemeralactivity– wecannotseeit--onlyitsside-effects– wecannottouchit--onlythemachinewithinwhichitiscontainedandsometimesnoteventhen
– wecannotobserveitdirectlyinfact,werequiremoresoftwaretodiagnoseandcorrectit
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Objectives
Givenhowmuchwerelyonourunderstandofabstractions...
...weprobablyshould...Psychology
•...understandwherethoseabstractionslive•...understandhowthoseabstractionscometoexist•...understandthelimitationsofthoseabstractions
Philosophy•...learnwhattoquestionandwhy•...cometogripswithwhatweknowanddon'tknow•...beginwhereallsciencebegan
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Philosophy
What,exactly,isit?
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Philosophy
Whatisphilosophy?– "loveofwisdom"(AncientGreek)– thefundamentalrootofallthinking– thebasisofallscience– "scienceinonehand,andreligionintheother"– thecentralquestionthatphilosophyseekstoanswer
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Philosophy
Ironically,mostofusare(already)philosophers– whatshouldwedo?– whatisthere?– howdoweknow?ifwedon'tknow,howshouldwesetaboutfindingout?
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Philosophy
Majorbranchesofphilosophy– Metaphysics
examiningwhatexists,thedifferencebetweenmindandmatter,andsoon
– Epistemologyhowdoweknowathing?howdoweacquireknowledge?whatisthenatureofknowledge?
– LogicAristoteliansyllogismsupthroughmathematicalandsymboliclogic
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Philosophy
Majorbranchesofphilosophy– Moralphilosophyandethics
whatisright?whatisevil?whatisvirtue?whatdoesitmeantoliveagoodlife?
– Politicalphilosophywhatarethe"unassailablehumanrights"?whatistherelationshipbetweengovernmentandthegoverned?
– Aestheticswhatisbeauty?whatisart?
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Philosophy
RogerScruton("AShortHistoryofPhilosophy")– twodistinguishingcharacteristicsofphilosophicalthought
•abstraction•concernfortruth
– "Problemsofphilosophyandthesystemsofdesigntosolvethemarepopulatedintermswhichtendtorefernottotherealmofactuality,buttotherealmsofpossibilityandnecessity:towhatmightbeandwhatmustbe,ratherthanwhatis"
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Philosophy
Philosophyischaracterizedbyseveralthings– studentsareencouragednottoaccepttheconclusionsoftheirteachers,buttodiscuss,argueanddisbelieve
– argumentsarerootedinlogicandreason,notfaithorbelief
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Philosophy
Mostsciencebeginsasphilosophy– "Ithasoftenbeenremarkedthatwhenanareaofinquirybeginstofinditsfeetasadiscipline,withclearlyagreedmethodsandaclearlyagreedbodyofknowledge,fairlysoonitseparatesofffromwhathasuptothenbeenknownasphilosophyandgoesitsownway."
– suchas....•physics•chemistry•astronomy•psychology
– somecontinuetomaintaintightrelationships
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TheSoritesParadox
Exerciseinphilosophicalthought
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TheSoritesParadox
Whendoindividualgrainsofsandbecomeaheap?
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TheSoritesParadox
Whendoindividualgrainsofsandbecomeaheap?
Moreimportantly,whydoesthisparadoxtakeplace?
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Zeno'sParadoxes
Findtheflawintheargument
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Zeno'sParadoxes
ThegodApolloandaturtlearegoingtorace
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Zeno'sParadoxes
ThegodApolloandaturtlearegoingtoraceApollogivestheturtleahugeheadstart
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Zeno'sParadoxes
ThegodApolloandaturtlearegoingtoraceApollogivestheturtleahugeheadstartButifApollomakesuphalfthedistancebetweenhim
andtheturtleeverysecond...
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Zeno'sParadoxes
ThegodApolloandaturtleaegoingtoraceApollogivestheturtleahugeheadstartButifApollomakesuphalfthedistancebetweenhim
andtheturtleeverysecond......hecannevercatchtheturtle!
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Zeno'sParadoxes
Anarrowisloosedfromabowtoflythroughtheair
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Zeno'sParadoxes
AnarrowisloosedfromabowtoflythroughtheairButinanysinglemomentintime,thearrowisnot
moving
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Zeno'sParadoxes
AnarrowisloosedfromabowtoflythroughtheairButinanysinglemomentintime,thearrowisnot
moving...thereforethearrowisnotreallymovingatall!
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Xenophanes
Earlythoughtsonwhatweknow
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Xenophanes
XenophanesofColophon(570- 475?BC)– exiledtoSouthernItaly– criticizedHomerianconceptofanthropomorphizedgods– thefirsttoactuallyengageinevidence-basedargument– histhoughtscenteredaroundthenatureofknowledgeitself
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Xenophanes
Godsareareflectionoftheculturethatworshipsthem– 'theEthiopiansmaketheirgodsblackandsnub-nosed;– 'theThracianssaytheirshaveblueeyesandredhair.– 'ifoxenandhorseshadhandsandcouldpaint,– 'oxenwouldpainttheirgodsasoxen,andhorsesashorses.'
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Xenophanes
Naturalnatureoftheuniverse:Mud– hehadnoticedfossilremainsintheearth– guessedthatperhapstheworlddriedup
•thusreturningtoitsoriginalmuddystate•trappingandpreservingthecreaturesasitdid
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Xenophanes
Truebelief– whenwesaywe"know"something,thatknowledgeisactuallyonlya"truebelief"ahypothesisgoodenoughforustoworkfrom
– hemaintainedthata"truthofreality"didexist,butwillalwaysbebeyondourhumanunderstandingthebestwecandoisrefineourhypothesescontinuallytogetnearertoit
– leadstoamethodologyoffalsificationpickedupinmoderntimesbyKarlPopper
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Psychology
Thestudyofbehavior
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Psychology
Psychologyis...– "thescientificstudyofthehumanmindanditsfunctions,especiallythoseaffectingbehaviorinagivencontext"
– "thementalcharacteristicsorattitudeofapersonorgroup"
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Psychology
Fivemainperspectives– Biological
therelationshipofthebodyandthemind– Learning
long-lastingchangeinthewayaperson/animalbehavesthatisattributableexperience
– Cognitivestudyofmemory,perception,thoughtandothermentalprocesses
– Socioculturalhowsocialenvironmentandculturalbeliefsshapeourlives
– Psychodynamicstudyofunconsciousmotivesanddesires
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'Psychomythology'
"Commonsenseisnotsocommon"--Voltaire(1764)
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Psychomythology
"Oppositesattract""Sparetherod,spoilthechild""Familiaritybreedscontempt""There'ssafetyinnumbers"
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Psychomythology
Thesearepopularsayings/platitudes– mostpeopleholdthemtobeself-evident– when,infact,sciencerepudiatesalloftheabove– manyofthese"facts"comefromthe"poppsychology"world
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Psychomythology
Somepopularpsychological"facts"– "Weonlyuse10%ofourbraincapacity"– "Ifweareangry,it'sbettertoexpresstheangerdirectlythanholditin"
– "Mostsexually-abusedchildrengrowuptobecomeabusersthemselves"
– "Peoplewithschizophreniahave'split'personalities"– "Peopletendtoactstrangelyduringafullmoon"
Alloftheseareverifiablyfalse
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ReasonsforPsychomythology
Whydowebelieveinfalsehoods?
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Reasons
Insomecases,wearemisledbysupposedexperts– "DrPhil"likestousetheliedetectoronhisshow
wheninfactliedetectorsarenotnearlyasaccurateasassumed
– popularauthorswillsometimesgetthepsychologywrongweareforcedtoaccepttheirclaimsonfaithalone
– ortheywillexplainonlypartsofitbecausetheywanttokeepourattention
– ortheirreaderswillonlyholdontothesimplestpartsofitbecauseourmemoryisfallibleandweseekpatterns
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Reasons
Insomecases,webelievewearetheexperts– orcloseenough,anyway--howhardcanitreallybe?– "ifIamsmartenoughtodo(somecomplicatedactivity),Iamsmartenoughtounderstandthisotherstuff"it'swhatleadsdoctorstobelievetheyarelawyers,andlawyerstobelievetheyarerocketscientists,andsoon
– thisishubrisitisadifficultthingtoovercome;itrequiresaconstantself- orexternally-imposedmonitoringofourthoughtsandactions
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Reasons
Insomecases,thescienceis"closeenough"– ...butnotperfect– example:'ulcersarecausedbybody'sreactiontostress'
•nocure;"lower-stresslifestyleandamanageddiet"•twoAustralianresearchers(BarryMarshall,RobinWarren)discoveredbacteriuminthestomach•"notpossible--nothingcouldsurvivehumanstomachacid"•meet"Helicobacterpylori":itdoes,infactsurviveinthestomach•...andtheseulcerscanbetreatedbyeverydayantibiotics•...andtheywonaNobelPrizeforit•theyweren'tthefirstto"discover"it;ithadbeenspottedbyatleastthreeseparateteamsofresearchersacenturyearlier
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Reasons
Insomecases,itcontradictsourcommonsense– ourbrainsaregoodatinterpretingtheworld– ourbrainsareterribleatinterpretingourbrains
JacobBronowski(1966)calledthis"reflexivity"– thereisnotyetanykindof"debugger"forthebrain
thoughwemaybegettingcloser....
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Reasons
PsychologicalSciencevs"Commonsense"– TalkshowhostDennisPrager:
"Therearetwokindsofstudiesintheworld:thosethatconfirmourcommonsense,andthosethatarewrong""Useyourcommonsense.Wheneveryouhearthewords'studiesshow'--outsideofthenaturalsciences--andyoufindthatthesestudiesshowtheoppositeofwhatcommonsensesuggests,beveryskeptical.Idonotrecallevercomingacrossavalidstudythatcontravenedcommonsense.(Prager,2002,p1)"
– MalcolmGladwellgetsintothis("Blink")
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Reasons
Andyet...scienceis"uncommonsense"– "Phrenologycandetermineyourpersonality"– "X-Raysareharmlessfestivalentertainment"– "Emotionsoriginatefromtheheart"– "Womenarelessintelligentthanmen"– "Thebodyismadeupoffour'humours':blood,blackbile,yellowbileandphlegm"thoselastthreewereAristotle'sbeliefs
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Reasons
Andyet...scienceis"uncommonsense""Nothingcouldbemoreobviousthanthattheearthisstableandunmoving,andthatwearethecenteroftheuniverse.ModernWesternsciencetakesitsbeginningfromadenialofthiscommonsenseaxiom...Commonsense,thefoundationofeverydaylife,couldnolongerserveforthegovernanceofworld.(Borstin,1983,p.294)"
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Reasons
Thisdoesn'tmeanallcommonsenseiswrong– happyemployeesgetmoreworkdonethanunhappyones
Butitdoesmeanthatweneedtotreatcommonsensewithskepticism– if"everybodyknows",thenmaybethey'rewrong
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Psychomythology:Sowhat?
Whatcanithurt?
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Sowhat?
Whatrealdamageistheretobelievinginafewfolktales?– nobodyeverdiedfrombelievinginGreekmyths,right?
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Sowhat?
Psychologicalmythscanbeharmful– jurorswhobelievememoriesarelikevideotapewillvotetoconvictadefendantonthebasisofconfidently-heldinaccurateeyewitnesstestimony
– parentswhobelievepunishingchildrenisaneffectivemeansofchanginglong-termbehaviorwillachievetheopposite
– doctorswhorefusetoallowtheirauthoritytobequestionedwillcontinuetokillpatients
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Sowhat?
Psychologicalmythscancauseindirectdamage– thebeliefthatweare"rationalactors"whenwemakeeconomicdecisions
– peoplewastemoneyon"subliminalself-helptapes"– wemaymakedecisionsbasedoninaccurateinformation(suchasapoliticalcandidate'shonestyorwhatthey'vesaidornotsaid
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Sowhat?
Theacceptanceofpsychologicalmythscanimpedeourcriticalthinkinginotherareas– ourfailuretodistinguishmythfromrealityinonedomainofscientificknowledgecaneasilyspillovertoafailuretodistinguishfactfromfictioninotherareas(CarlSagan)
– asaconsequence,wemayfindourselvesatthemercyofpolicy-makerswhomakeunwiseand/ordangerousdecisions
– "Knowledgeispower;ignoranceispowerlessness"SirFrancisBacon
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Bustingpsychomythology
Clearingoutthegarbage
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Psychomythbusting
Amythbustingtoolkit– thesearetencommonsourcesoferror– compensateforthemwheneverusedorseen
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Psychomythbusting
Tensourcesoferror– Word-of-Mouth("urbanmyths")– DesireforEasyAnswersandQuickFixes– SelectivePerceptionandMemory– InferringCausationfromCorrelation– PostHoc,ErgoPropterHocReasoning
"afterthis,thereforebecauseofthis"
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Psychomythbusting
Tensourcesoferror– ExposuretoaBiasedSample– ReasoningbyRepresentativeness
bewareofheuristics(mentalshortcuts/rulesofthumb)– MisleadingFilmandMediaPortrayals– ExaggerationofaKernelofTruth– TerminologicalConfusion
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Perception
Notquiteasobjectiveasyouthink
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Perception
Literalvisualandauditorystimuliisnottheendofthestory– rodsandconesinterpretcolorsofwhatwesee– butimagesareeasily"separated"intogroups– thebraininterpretsimagesusingaformofpatternrecognition
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Perception
GestaltPsychology– aschoolofthoughtoriginatinginGermanyintheearly1900s
– peopleorganizevisualinformationintopatternsandforms– thisexplainsmanyopticalillusions,forexample
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Perception
GestaltPrinciples– Figureandground
•"figure"iswhatstandsout•"ground"isthebackdropinwhichthefigureappears
– Proximitywhenobjectslieclosetogether,objectsareperceivedasagroup
– Closureinterpretfamiliar,incompleteformsascompletebyfillingingaps
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Perception
GestaltPrinciples– Similarity
•groupsimilarobjectstogether•theninterpretthelargerpattern
– Continuityinterruptedlines/patternsareinterpretedtobecontinuousw/gaps
– Simplicityperceivesformsassimple,symmetricalfiguresratherthanirregularones
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Perception
DepthPerception– inordertoperceivedistance,weusebinocularandmonocularcues
– binocular:cuesthatrequirebotheyes– monocular:cuesthatrequireonlyoneeye
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Perception
Binocularcues– Retinaldisparity
•theeyeslieafewinchesapart•thustheirretinasthuspickupslightlydifferentimagesofobjects•retinaldisparityincreasesastheeyesgetclosertoanobject
– Convergence•theeyesmustturn"inward"(towardseachother)tolookatanobjectclose-up•theclosertheobject,themoremusclemovement•thus,themoremusclemovement,theclosertheobjectis
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Perception
Monocularcues– Interposition
whenoneobjectisblockingpartofanother,theblockedobjectappearsfurtheraway
– Motionparallax(relativemotion)•whentheviewerismoving,stationaryobjectsappeartomoveindifferentdirections/speedsdependingontheirlocation•themoredistanttheobject,thesloweritmoves•theclosertheobject,thefasteritmoves
– Relativesizepeopleseeobjectsthatmakeasmallerimageontheretinaasfartheraway
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Perception
Monocularcues– Relativeclarity
objectsthatappearcharp,clearanddetailedareseenascloserthanhazyobjects
– Texturegradientsmallerobjectsthataremorethicklyclusteredappearfartherawaythanobjectsthatarespreadoutinspace
– Linearperspective•parallellinesthatconvergeappearfartheraway•themorethelinesconverge,thegreatertheperceiveddistance
– Lightandshadowpatternsoflight/shadowmakeobjectsappearthree-D
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Perception
Perceptualconsistency– theabilitytorecognizethananobjectremainsthesameevenwhenitproducesdifferentimagesontheretina
– shapeconstancy– sizeconstancy– brightnessconstancy– colorconstancy– locationconstancy
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Perception
Perceptualset– thereadinesstoseeobjectsinaparticularwaybasedonexpectations,experiences,emotions,andassumptions
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Perception
Selectiveattention– theabilitytofocusonsomebitsofsensoryinformationandignoreothersthisiswhatallowsyoutoreadtheseslidesorwatchthistalk!
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Perception
Contexteffects– peoplesimmediatesurroundingscreateexpectationsthatmakethemseeinparticularways
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Summary
Finishingup
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Summary
Whatdowedowiththis?– whatmakesgoodcode?whatisagoodprogrammer?– howdowehirethebest?howdowekeepthem?– doesagileactuallywork?orwas/istheresomethingelseactuallyatwork?
– managingcustomerinteractions/interviews