Ka taƙaita labarin:  Masana kimiyya sun yi da'awar cewa matsakaicin hankali na 'yan Adam ya ci gaba da ƙaruwa. A wani bincike da aka yi a shekarun da suka gabata, sun gano cewa gwajin yana da wuya sosai, amma mutane suna ci gaba da yin nasara. Amma ba a san dalilan da ya sa mutane suke zama masu basira ba - da ra'ayoyi da suka haɗa da ingantaccen ilimi da kuma ingantaccen kula da lafiya. Masu bincike a Kwalejin Kings da ke Landan sun yi nazari a kan wannan batun har tsawon shekaru 64. A cikin duka, an yi nazarin fiye da mahalarta 200,000 a cikin gwajin IQ. Tun 1950, an gano cewa matsakaicin hankali ya tashi da maki 20 na IQ. Bayanai sun hada da ingantaccen ilimi (hoton hoton da aka nuna) da kuma ingantaccen kiwon lafiya. Binciken, mai taken A Cross-Temporal Meta-Analysis of Raven's Progressive Matrices kuma William Kremer ya ruwaito shi don BBC, an buga shi a cikin mujallar hankali. An gudanar da su ne daga Peera Wongupparaj, Veena Kumari da Robin Morris daga Kings College London, sun duba musamman a Raven's Progressive Matrices (RPM). Talauci yana shafar hankali na yara tun yana ɗan shekara biyu, wani binciken daban a watan Disamba na 2014 ya gano - kuma tasirinsa yana ƙaruwa yayin da yaro ya tsufa. An gano cewa yara ƙanana da ba su da abin biyan bukata suna da maki shida a kan matsakaici, fiye da yara daga iyalai masu arziki. Kuma wannan bambanci ya yi girma a lokacin da suke yara, kuma bambancin ya yi girma sau uku sa'ad da yaran suka kai shekaru goma. Masana kimiyya daga Goldsmiths, Jami'ar London sun kwatanta bayanai a kan kusan yara 15,000 da iyayensu a matsayin wani ɓangare na Nazarin Ci Gaban Twins (Teds). Binciken bincike ne na ci gaba da bincike na zamantakewa da tattalin arziki da kuma kwayoyin halitta ga hankali. Wannan aikin yana sa mahalarta su nemi tsari a cikin nau'ikan siffofi - kuma ana tunanin cewa kyakkyawan ma'auni ne na hankali. Gabaɗaya, an yi nazarin sama da mahalarta 200,000 daga ƙasashe 48 sama da shekaru 64 a cikin binciken. An gano cewa tun daga shekara ta 1950, matsakaicin basira ya ƙaru da maki 20 na IQ. 'RPM ne mai inganci da kuma abin dogara ma'auni na general IQ,
Masu bincike a Kwalejin Kings ta London sun yi nazari a kan shekaru 64 da suka gabata. Gabaɗaya, an yi nazarin sama da mahalarta 200,000 a cikin gwajin IQ. Tun daga 1950, an sami matsakaicin hankali ya tashi da kimanin maki 20 na IQ. Dalilai sun hada da ingantaccen ilimi da ingantaccen kiwon lafiya.