Magnetic resonance imaging brain size/IQ relations in Turkish university students

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Tan U., Tan M., Polat P., Ceylan Y., Suma S., Okur A.

INTELLIGENCE, vol.27, no.1, pp.83-92, 1999 (SSCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 1
  • Publication Date: 1999
  • Doi Number: 10.1016/s0160-2896(99)00015-x
  • Journal Name: INTELLIGENCE
  • Journal Indexes: Social Sciences Citation Index (SSCI), Scopus
  • Page Numbers: pp.83-92
  • Karadeniz Technical University Affiliated: No


The relation of IQ (Cattell's Culture Fair Intelligence Test) to brain size was studied in 103 right- and left-handed men and women at Ataturk University in eastern Turkey. Cerebral areas were measured on a midsagittal section of the brain using MRI. An overall correlation of 0.40 was found between MRI-measured total area and IQ thereby further supporting the IQ-brain size hypothesis. Additional analyses suggested that these results may need qualification. In men, only anterior cerebral area correlated with IQ. In women, total and posterior cerebral areas were correlated with IQ. Other results varied by handedness.