▁Ch om sky ▁questions ▁how ▁humans ▁can ▁know ▁so ▁much , ▁despite ▁relatively ▁limited ▁input . ▁He ▁arg ues ▁that ▁they ▁must ▁have ▁some ▁kind ▁of ▁inn ate ▁learning ▁mechanism ▁that ▁processes ▁input , ▁and ▁that ▁mechanism ▁must ▁be ▁domain - specific ▁and ▁inn ate . ▁Ch om sky ▁obser ves ▁that ▁physical ▁org ans ▁do ▁not ▁develop ▁based ▁on ▁their ▁experience , ▁but ▁based ▁on ▁some ▁inher ent ▁gen etic ▁coding , ▁and ▁wrote ▁that ▁the ▁mind ▁should ▁be ▁treated ▁the ▁same ▁way . ▁He ▁says ▁that ▁there ▁is ▁no ▁question ▁that ▁there ▁is ▁some ▁kind ▁of ▁inn ate ▁structure ▁in ▁the ▁mind , ▁but ▁it ▁is ▁less ▁agreed ▁upon ▁whether ▁the ▁same ▁structure ▁is ▁used ▁by ▁all ▁organ isms ▁for ▁different ▁types ▁of ▁learning . ▁He ▁comp ares ▁humans ▁to ▁r ats ▁in ▁the ▁task ▁of ▁ma ze ▁running ▁to ▁show ▁that ▁the ▁same ▁learning ▁theory ▁cannot ▁be ▁used ▁for ▁different ▁species ▁because ▁they ▁would ▁be ▁equally ▁good ▁at ▁what ▁they ▁are ▁learning , ▁which ▁is ▁not ▁the ▁case . ▁He ▁also ▁says ▁that ▁even ▁within ▁humans , ▁using ▁the ▁same ▁learning ▁theory ▁for ▁multiple ▁types ▁of ▁learning ▁could ▁be ▁possible , ▁but ▁there ▁is ▁no ▁solid ▁evidence ▁to ▁suggest ▁it . ▁He ▁propos es ▁a ▁hypothesis ▁that ▁claims ▁that ▁there ▁is ▁a ▁bi olog ically ▁based ▁language ▁fac ulty ▁that ▁organ izes ▁the ▁lingu istic ▁information ▁in ▁the ▁input ▁and ▁const ra ins ▁human ▁language ▁to ▁a ▁set ▁of ▁particular ▁types ▁of ▁gr amm ars . ▁He ▁introdu ces ▁universal