Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Nazarin farko na jikin mutum dangane da jinsi shine R. B. Bean, masanin ilimin lissafi na Philadelphia, wanda ya ba da shawarar a cikin 1906 cewa "girman girman jiki na jiki na iya nufin aiki na musamman na hankali" kuma akwai bambance-bambance masu ma'ana tsakanin maza da mata. Wataƙila yana nuna yanayin siyasa na lokacin, ya ci gaba da da'awar bambance-bambance a cikin girman callosum tsakanin tsere daban-daban. Franklin Mall, darektan dakin gwaje-gwajen nasa ne ya karyata bincikensa a ƙarshe. Daga cikin manyan tasirin da aka samu shine labarin 1982 na Kimiyya ta Holloway da Utamsing wanda ya nuna bambancin jima'i a cikin yanayin kwakwalwar ɗan adam, wanda ke da alaƙa da bambance-bambance a cikin ƙwarewar hankali. Lokaci ya wallafa wata kasida a 1992 wanda ya ba da shawarar cewa, saboda jikin yana da "mafi girma a cikin kwakwalwar mata fiye da na maza, yana iya ba da damar yin magana mai zurfi tsakanin hemispheres - watakila tushen ƙwarewar mata".Bayanin kwanan nan a cikin wallafe-wallafen ilimin halayyar kwakwalwa sun nuna shakku game da ko girman jikin jikin mutum ya bambanta. A meta-bincike na 49 karatu tun 1980 ya gano cewa, akasin de Lacoste-Utamsing da Holloway, babu bambancin jima'i da za a iya samu a cikin girman jikin callosum, ko an yi la'akari da girman girman kwakwalwa na namiji. Nazarin da aka yi a 2006 ta amfani da MRI na bakin ciki bai nuna wani bambanci a kauri na jikin ba lokacin da yake lissafin girman batun.  Tambaya: Masanin ilimin lissafi R.B. Bean daga wane birni ne na Amurka?
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