Testing versus understanding human intelligence

Intelligence may be studied in 2 distinct ways, using a psychometric or a b iological approach. The psychometric approach is focused on the assessment of a person's level of mental ability and documents individual differences between people in mental abilities. Biological studies seek those brain fun ctions that cause individual differences in human mental abilities. The lac k of overlap between these approaches means that it is unclear what the sco res of intelligence tests mean in terms of fundamental biological processes of the brain.