<prompt> Fingqa isihloko: Ososayensi baye bathi ubuhlakani obuvamile besintu buye banda ngokuqhubekayo. Ekucwaningeni okubuyekeza ukuhlolwa kwe-IQ emashumini ambalwa eminyaka adlule, bathola ukuthi ukuhlolwa kwakulokhu kuba nzima - kodwa abantu babesenza kahle ngendlela efanayo. Kodwa izizathu zokuthi kungani abantu beba ngabahlakaniphe kakhudlwana azikaziwa - kunemibono ehlanganisa imfundo engcono nokunakekelwa kwezempilo okuthuthukisiwe. Abacwaningi baseKings College eLondon bahlaziya izilinganiso zeminyaka engu - 64. Sekukonke, kwahlolwa abantu abangaphezu kuka - 200 000 ababebhekene nokuhlolwa kwe - IQ. Kwatholakala ukuthi kusukela ngo-1950, ubuhlakani obuvamile bukhuphuke ngamaphuzu angu-20 e-IQ. Izizathu zihlanganisa imfundo engcono isithombe sesitoko sibonisiwe nokunakekelwa kwezempilo okuthuthukisiwe. Lolu cwaningo, olunesihloko esithi A Cross-Temporal Meta-Analysis of Ravens Progressive Matrices futhi olwabikwa uWilliam Kremer we-BBC, lwashicilelwa ephephabhukwini i-intelligence. Lolu cwaningo olwenziwa uPeera Wongupparaj, uVeena Kumari noRobin Morris baseKings College eLondon, lwabhekisisa ngokukhethekile ama-RPM Ravens Progressive Matrices. Ucwaningo oluhlukile olwenziwa ngo-December 2014 lwathola ukuthi ubumpofu buthinta ubuhlakani bezingane ezineminyaka emibili kuphela ubudala - futhi umthelela wabo uyakhula njengoba ingane ikhula. Kwatholakala ukuthi izingane ezincane ezihluphekayo zinamaphuzu aphansi ayisithupha e-IQ, ngokwesilinganiso, kunezingane ezivela emindenini ecebile. Futhi igebe lakhula kakhulu ebuntwaneni, futhi umehluko wokuqala waphindeka kathathu ngesikhathi izingane zifinyelela ebusheni. Ososayensi baseGoldsmiths, e-University of London baqhathanisa imininingwane yezingane ezingaba ngu-15.000 nabazali bazo njengengxenye yocwaningo olwaziwa ngokuthi i-Twins Early Development Study Teds. Lolu cwaningo luhlolisisa izixhumanisi zezenhlalo nezomnotho nezakhi zofuzo ezihlobene nokuhlakanipha. Lokhu kwenza ababambiqhaza bafune amaphethini ezinhlotsheni ezihlukahlukene - futhi kucatshangwa ukuthi kuyindlela enhle yokulinganisa ubuhlakani. Sekukonke, abantu abangaphezu kuka - 200 000 abavela emazweni angu - 48 iminyaka engaphezu kuka - 64 babhekwa kulolu cwaningo. Kwatholakala ukuthi kusukela ngo-1950, ubuhlakani obuvamile buye bakhuphuka ngokuphindwe ngamaphuzu angu-20 e-IQ. I-RPM iyisilinganiso esivumelekile nesinokwethenjelwa se-IQ ejwayelekile,...  <response>: Abacwaningi baseKings College eLondon babheka amaphuzu eminyakeni engu - 64 edlule. Sekukonke, kwahlolwa abantu abangaphezu kuka - 200 000 ababebhekene nokuhlolwa kwe - IQ. Kusukela ngo - 1950, kwatholakala ukuthi ubuhlakani obuvamile bukhuphuke ngamaphuzu angu - 20 e - IQ. Izizathu zihlanganisa imfundo engcono nokunakekelwa kwezempilo okuthuthukisiwe. 