Studie kopplar människans högerhänthet till tvåbenthet och hjärnans expansion

Forskare vid Oxfords universitet har funnit att upprätt gång och större hjärnor sannolikt har drivit den starka preferensen för höger hand som ses hos moderna människor. Resultaten kommer från en analys av primatarter och utdöda homininer.

Ett team lett av Dr. Thomas A. Püschel undersökte data från 2 025 apor och människoapor från 41 arter. De använde bayesiansk modellering för att testa faktorer som hjärnstorlek och förhållandet mellan arm- och benlängd, vilket är en markör för tvåbent rörelse. När dessa egenskaper inkluderades framstod människor inte längre som ett evolutionärt undantag bland primater.

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