Specialiştii care au realizat acest studiu au
ajuns la concluzia că memoria, autocontrolul, logica şi abilităţile matematice sunt legate de calitatea membranei care protejează nervii materiei albe.
Cercetătorii de la Universitatea California, din Los Angeles, au examinat creierele a 23 de perechi de gemeni identici, folosind un nou tip de tehnică pe bază de rezonanţă magnetică. Rezultatele testelor au arătat că ţesuturile din care este alcătuită materia albă au dimensiuni diferite.
Aceştia au mai descoperit că inteligenţa stă în genele pe care le moşteneşte fiecare în parte, gene care influenţează dimensiunea membranei care acoperă materia albă. Cu cât membrana este mai groasă cu atât nervii aflaţi în această porţiune a creierului sunt mai protejaţi, deci mai bine stimulaţi şi astfel oamenii sunt mai inteligenţi.
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