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1、2015.10.29fromBBCIsanothermanlivinginsideyou?ByDavidRobsonYoumaythinkyourbodyandmindareyourown.Infact,youareafusionofmanyorganisms-including,potentially,anotherperson.WordsbyDavidRobson,photographybyArikoInaoka.Onceuponatime,youroriginswereeasytounderstand.Yourdadmetyourmum,the
2、yhadsomefun,andfromatinyfertilisedeggyouemergedkickingandscreamingintotheworld.Youarehalfyourmum,halfyourdad–and100%yourself.Except,thatsimpletalehasnowbecomealotmorecomplicated.Besidesyourgenesfromparents,youareamosaicofviruses,bacteria–andpotentially,otherhumans.Indeed,ifyoua
3、reatwin,youareparticularlylikelytobecarryingbitsofyoursiblingwithinyourbodyandbrain.Strangerstill,theymaybeinfluencinghowyouact.Averylargenumberofdifferenthumanandnon-humanindividualsarestrugglinginsideusforcontrol“Humansarenotunitaryindividualsbutsuperorganisms,”saysPeterKrame
4、rattheUniversityofPadua.“Averylargenumberofdifferenthumanandnon-humanindividualsareallincessantlystrugglinginsideusforcontrol.”TogetherwithPaolaBressan,herecently wroteapaperinthejournalPerspectivesinPsychologicalScience,callingforpsychologistsandpsychiatriststoappreciatetheway
5、sthismayinfluenceourbehaviour.Overthelast6years,photographerArikoInaokahascapturedthespecialconnectionbetweentwoIcelandictwins,ErnaandHrefna(Credit:ArikoInaoka)Thatmaysoundalarming,butithaslongbeenknownthatourbodiesarereallyamishmashofmanydifferentorganisms.Microbesinyourgutcan
6、produceneurotransmittersthatalteryourmood;somescientistshaveevenproposedthatthemicrobesmayswayyourappetite,sothatyoucravetheirfavouritefood.Aninfectionofaparasitecalled Toxoplasmagondii,meanwhile,mightjustleadyoutoyourdeath.Innature,themicrobewarpsrats’brainssothattheyareattrac
7、tedtocats,whichwillthenofferacosyhomeforittoreproduce.Buthumanscanbeinfectedandsubjectedtothesamekindofmindcontroltoo:themicrobeseemstomakesomeonerisky,andincreasesthechancetheywillsufferfromschizophreniaorsuicidaldepression.Currently,aroundathirdofBritishmeatcarriesthisparasit
8、e,forinstance–despitethefactaninfectioncouldcontribute