Home > Archive > Volume 51, No. 1 > This paper

IQ and Head Size in a Sample in Sudan

Omar Khaleefa, Khalil Ali and Richard Lynn


Published: 2010/09/01


We report a study of the relationship between head circumference and intelligence measured by the Standard Progressive Matrices (SPM) in a sample of 240 adults in Sudan. The correlation is 0.21 and is the same as that obtained in numerous European samples. Men had a higher average head circumference and a higher mean score on the SPM than women. Men had lower variability of intelligence than women, contrary to numerous claims to the contrary.

   Download PDF