American psychologist & scholar
According to Wikipedia, John Leonard Horn was a scholar, cognitive psychologist and a pioneer in developing theories of multiple intelligence. The structure of mental abilities For his PhD research at the University of Illinois, Horn identified other broad intellectual abilities to supplement fluid reasoning ability and crystallized ability postulated by his supervisor Raymond Cattell. As with Cattell, Horn rejected the existence of an even higher level factor of general intelligence ‘g’ asserted by Spearman . In Horn he reported a full list of such broad level abilities:
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John L. Horn is affiliated with the following schools: