Journal
HUMAN BRAIN MAPPING
Volume 36, Issue 4, Pages 1407-1416Publisher
WILEY
DOI: 10.1002/hbm.22710
Keywords
intelligence; IQ; caudate; dorsal striatum; magnetic resonance imaging
Funding
- John Templeton Foundation, National Science Foundation [DRL 0644131]
- National Institute of Mental Health [F32 MH077382]
- National Institute of Health [R03 DA029177-01A1]
- National Science Foundation [SES-1061817]
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This study examined the association between size of the caudate nuclei and intelligence. Based on the central role of the caudate in learning, as well as neuroimaging studies linking greater caudate volume to better attentional function, verbal ability, and dopamine receptor availability, we hypothesized the existence of a positive association between intelligence and caudate volume in three large independent samples of healthy adults (total N=517). Regression of IQ onto bilateral caudate volume controlling for age, sex, and total brain volume indicated a significant positive correlation between caudate volume and intelligence, with a comparable magnitude of effect across each of the three samples. No other subcortical structures were independently associated with IQ, suggesting a specific biological link between caudate morphology and intelligence. Hum Brain Mapp 36:1407-1416, 2015. (c) 2014 Wiley Periodicals, Inc.
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