Journal
PSYCHOLOGICAL MEDICINE
Volume 36, Issue 4, Pages 547-554Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0033291705006732
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Background. Although a correlation between the central dopaminergic system and intelligence may exist, the results from imaging studies remain inconclusive. The aim Of this Study was to explore the relationship between striatal dopamine D-2/D-3 receptor availability and verbal intelligence quotient (VIQ) using single photon emission computed tomography (SPECT). Method. Striatal D-2/D-3 receptor availability of 64 healthy subjects was determined with the [I-123]liodoberizamide ([I-123] IBZM) ligand. Intelligence quotients (IQs) of the Subjects were measured by the Wechsler Adult Intelligence Scale - Revised (WAIS-R). Results. In addition to age, left striatal D-2/D-3 receptor availability correlated positively with VIQ. In females, left striatal D2/D3 receptor availability was the only variable that correlated significantly with the similarities subtest of VIQ. Conclusions. There is a relationship between left striatal D-2/D-3 receptor availability and verbal intelligence, which varies, predominantly in males.
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