WEBVTT

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RSA Animate

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Iain McGilchrist Den opdelte hjerne og den vestlige verdens opbyggelse

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Opdelingen af hjernen er noget som neurologer bare ikke taler om mere

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Omtalen var populær omkring 60'erne of 70'erne

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Efter de første opdelte hjerne operationer

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og det ledte til en slags popularisering

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som senere hen er blevet bevist som falsk

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Det er ikke rigtigt, at en del af hjernen styrer logik

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og den anden styrer følelser

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Begge er på hver sin måde involveret i begge

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Det er ikke rigtigt at sprog afkommer fra den venstre hemisfære

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og heller ej at vigtige aspekter afkommer fra den højre

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Det er ikke sandt at visuelle billeder kun afkommer fra den højre hemisfære

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meget af det er fra den venstre

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Og så videre, som en slags afskærmning, har folk opgivet at tale om det

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Men problemet vil ikke rigtig forsvinde

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Fordi organet [hjernen], hvis funktion er at lave forbindelser

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er uden tvivl opdelt

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Den er inde i os alle

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og den er blevet mere opdelt i takt med menneskets udvikling

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Så forholdet imellem Corpus Calosum og volumet af hemisfæren er blevet mindre igennem evolutionen og

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det blivere mere spændende når du indser, at en af hovede, hvis ikke hovedefunktionen af Corpus Callosum

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faktisk hæmmer den anden hemisfære

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Så noget meget vigtigt er i gang med at ske omhandlende at skilde ting fra hinanden

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Og ikkun det, men hjernen er også meget assymetrisk

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Den er bredere ved den venstre bagside, og bredere ved den højre forside, og glider en smele frem og tilbage

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Det er som om at nogen har fået fat nedenunder hjernen og givet den et twist med uret

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Hvad handler det nu om?

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Hvis man havde brug for mere hjerneplads, ville man gøre det symmetrisk. Kraniumet er symmetrisk

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Kassen hvori hjernen er, er symmetrisk

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Hvorfor gå igennem processen at udvide en del af hemisfæren, og nogle dele af den anden

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med mindre at de lavede ret forskellige ting

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Hvad laver de egentlig?

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Det er ikke kun os der har der her opdelte hjerner

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Fugle og dyr har dem også

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Jeg tror den nemmeste måde at tænke på det er hvis man forestiller sig

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at en fugl prøver at spise frø der ligger på grus eller småsten

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Den skal fokusere meget smalt og klart på det lille frø

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og skal også kunne samle den op, på trods af underlaget

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