Kenya Kura
Japanese north–south gradient in IQ predicts differences in stature, skin color, income, and homicide rate
Gifu Shotoku Gakuen University
regional differences iq estimated 47 prefectures japan iq scores obtained official achievement tests show gradient north south latitudes correlate height iq skin color r 070 044 047 respectively iq also correlates height 052 skin color 042 income 051 correction less homicide rate 060 less divorce 069 fertility infant mortality lower iq southern japanese islands could attributable warmer climates less cognitive demand fifteen hundred years