Deric Bownds from MindBlog reports on a fascinating study by Adolphs, Damasio, et al., that found an association between general intelligence (g) and:
"... damage to a remarkably circumscribed, although distributed, network in frontal and parietal cortex, critically including white matter association tracts and frontopolar cortex. They suggest hat general intelligence draws on connections between regions that integrate verbal, visuospatial, working memory, and executive processes."Bownds quotes from their discussion:
"The largest overlap between WAIS subtests and g was found for Arithmetic, Similarities, Information, and Digit Span; the former two tests also exhibited the greatest conjunction with g. These subtests assess verbal knowledge about the world, verbal reasoning, and abstraction, as well as working memory capacity, and are associated with the left inferior frontal gyrus, the superior longitudinal/arcuate fascicule, and to some degree with parietal cortex. This suggests that g draws on the combination of conceptual knowledge and working memory, and that the communication between areas associated with these capacities is of crucial importance."The actual article is available here.
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