Dezvoltarea creierului necesită o cantitate mare de energie. În consecinţă, o perioadă îndelungată s-a crezut că creierele mari se formează doar la animalele cu metabolism relativ rapid. Vera Weisbecker, de la Universitatea Cambridge, şi Anjali Goswami, de la University College of London au constat că lucrurile nu stau chiar aşa.
Oamenii de ştiinţă au comparat creierul a 197 de marsupiale şi 457 de mamifere placentare. Mamiferele placentare embrionare se află în legătură mai îndelungată cu mama. Dimpotrivă, marsupialele se nasc ‘imatur’ şi îşi dezvoltă creierul hrănindu-se cu lapte matern fiind deja fiinţe autonome, adică fără acces direct la nutrienţii organismului matern.
Se pare că primatele ca şi omul au moştenit creierul „disproporţionat” de mare datorită grijii materne. Creierul se dezvăltă mai întâi în timpul maturării fetale, iar, apoi, a hranei administrate în primii ani de viaţă.
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