He claimed that g was not made up of one single ability , but rather two genetically influenced , unique abilities working together .
Rising interest in the debate on the structure of intelligence prompted Spearman to elaborate and argue for his hypothesis .
Spearman claimed that g was not made up of one single ability , but rather two genetically influenced , unique abilities working together .
Rising interest in the debate on the structure of intelligence prompted Spearman to elaborate and argue for his hypothesis .