R. B. Bean, wani masanin ilimin lissafi na Philadelphia, wanda ya ba da shawarar a 1906 cewa "girman girman corpus callosum na iya nufin aiki na musamman na ilimi" kuma akwai bambance-bambance masu iya aunawa tsakanin maza da mata. Wataƙila yana nuna yanayin siyasa na lokutan, ya ci gaba da da'awar bambance-bambance a cikin girman callosum a tsakanin jinsi daban-daban. Binciken nasa daga karshe Franklin Mall, darektan dakin gwaje-gwajen nasa ya karyata shi.
Filadalfiya