Soo koob maqaalka:  saynisyahannadu waxay aaminsanyihiin in wada sheekaysigii ugu horeeyay ee dadku uu dhacay 50,000 ilaa 100,000 oo sano kahor Waxay sheegeen in badidoodu ay ka koobnaayeen dadka godka ku nool oo ku qeylinaya ama ugaadhsadeyaasha iyo aruureyaasha oo afka iska marinaya, ka hor inta aysan baranin sida loo hadlo. laakiin cilmi baaris cusub, ayaa waxay sheegtay in luuqada bani'aadamka ay si dhaqso ah u horumarisay iyadoo dadku ay si dhaqso ah u isticmaaleen jumlado adag oo codkoodu la mid yahay kuwa aynu caadiyan isticmaalno. saynisyahannadu waxay aaminsanyihiin in wada sheekaysigii ugu horeeyay ee dadku si tartiib tartiib ah u bilaabeen 50,000 ilaa 100,000 oo sano kahor waxay aaminsanyihiin in badidood ay ku lug lahaayeen, dadka godka ku nool in ay qayliyaan, ama ugaarsada-ururiyayaasha in ay afka iskaga sheekeystaan, inta aysan baranin in ay si faahfaahsan u hadlaan. Shigeru Miyagawa, oo ah Professor of Linguistics ee Massachusetts Institute of Technology wuxuu yiri: "Sida ay u muuqato luqada maanta ku hadasha waxay u muuqataa in ay ku jirtay luqada aadanaha tan iyo markii ay bilowday". Aqoonyahanada intooda badan waxay aaminsan yihiin in dadku markii ugu horaysay bilaabeen inay adeegsadaan 'luqad-hore', taas oo ahayd nooc hore oo isgaarsiineed oo leh kaliya horumar tartiib tartiib ah oo ereyo iyo ereyo. Laakiin sida uu sheegayo Professor Miyagawa, kelmadaha keli ah waxay leeyihiin astaamo muujinaya in ay ka yimaadeen nidaamkii hore, oo ay ku jiraan qaaciidooyin, halkii ay ka imaan lahaayeen ereyo fudud, oo asal ah. 'Maadaama aan ka heli karno ereyada ereyada, ma jirto sabab loo tixgeliyo inay yihiin' fosil luuqadeed 'oo ah marxalad hore, marxaladda pre-syntax,' ayuu raaciyay. Daraasad cusub oo uu sameeyay, mid ka mid ah aqoonyahanada luuqada ayaa ku dooday in luuqada aadanaha ay u badantahay in ay si dhaqso ah u horumarisay iyadoo dadku ay si dhaqso ah u isticmaalayeen jumlado adag oo u eg kuwa aynu nafteena ku hadalno. Sawirka hoos ku qoran waa dib u dhis lagu sameeyay raggii reer Rhodesia. Hadhaaga noocyada noocan ah waxaa la ogaaday in uu jiray 300,000 ilaa 125,000 oo sano ka hor. Professor Miyagawa wuxuu leeyahay fikrad ka duwan tan ku saabsan waxa abuuray luqada aadanaha. Waxa uu sheegay in aadanuhu isku daray lakabka 'hadalka' ee luuqada, sida laga arko heesaha shimbiraha, lakabka'macnaha' sida laga arko daanyeerada oo ku dhawaaqaya dhawaaqyo gooni ah, sida qaylada digniinta. 'Halaynta isdhexgalka' waxay soo jeedineysaa in wax kasta oo markii hore sababay, lakabyada luqaddan ay si dhakhso leh isugu darsadeen. Wargeyskiisa,
Wada sheekaysiga dadku wuxuu bilowday 50,000 ilaa 100,000 oo sano kahor. Professor Shigeru Miyagawa wuxuu xusay in ereyada kali ah ay leeyihiin astaamo dhismeed. Wuxuu sheegay in tani ay muujinayso in ereyada ay ka yimaadeen nidaamkii hore ee ereyada oo ay ku jiraan qaaciidooyin. Wuxuu aaminsanyahay in dadku ay isku darsadeen lakab'muuqaal' ah oo luqad ah, sida lagu arko heesaha shimbiraha, oo leh lakab 'erey' ah, sida lagu arko daanyeerada.