Magnetic Resonance Imaging Brain Size/IQ Relations in Turkish University Students

Tan, Uner and Tan, Meliha and Polat, Pinar and Ceylan, Yasar and Suma, Selami and Okur, Adnan (1999) Magnetic Resonance Imaging Brain Size/IQ Relations in Turkish University Students. [Journal (Paginated)]

Full text available as:

[img] PDF


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 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.

Item Type:Journal (Paginated)
Keywords:Intelligence, brain size, handedness, sex difference, magnetic resonance imaging
Subjects:Neuroscience > Neuropsychology
ID Code:1369
Deposited By: Tan, Uner
Deposited On:13 Mar 2001
Last Modified:11 Mar 2011 08:54

References in Article

Select the SEEK icon to attempt to find the referenced article. If it does not appear to be in cogprints you will be forwarded to the paracite service. Poorly formated references will probably not work.

Andreasen, N.C., Ehrhardt, J.C., Swayze, V.W., Alliger, R.J., Yuh, W.T.C., Cohen, G. and Ziebell, S., 1990. Magnetic resonance imaging of the brain in schizophrenia. Archieves of General Psychiatry 47, pp. 35-44. EMBASE

Andreasen, N.C., Flaum, M., Swayze, V., O'Leary, D.S., Alliger, R., Cohen, G., Ehrhardt, J. and Yuh, W.T.C., 1993. Intelligence and brain structure in normal individuals. American Journal of Psychiatry 150, pp. 130-134.


Ankney, C.D., 1992. Sex differences in relative brain size: The mismeasure of woman, too?. Intelligence 16, pp. 329-336.

Bradshaw, J.L., 1997. . Human evolution. A neuropsychological perspective Psychology Press, Publishers, East Sussex.

Cattell, R.B., 1973. . Manual for the Cattell culture fair intelligence test Institute for Personality and Ability Testing, Champaign, IL.

Cattell, R.B., 1987. Intelligence: its structure, growth and action. Advances in Psychology 35 Elsevier Science, Amsterdam, The Netherlands.

Davidson, R.J. and Hugdahl, K., 1995. . Brain asymmetry MIT Press, Cambridge, MA.

Finlay, B.L. and Darlington, R.B., 1995. Linked regularities in the development and evolution of mammalian brains. Science 268, pp. 1578-1583.

Galton, F., 1888. Head growth in students at the University of Cambridge. Nature 38, pp. 14-15.

Ho, K.C., Roessman, U., Straumfjord, J.V. and Monroe, G., 1980. Analysis of brain weight: I. Adult brain weight in relation to sex, race, and age. Archieves of Pathology and Laboratory Medicine 104, pp. 635-639. EMBASE

Hofman, M.A., 1991. The fractal geometry of convoluted brains. Journal fuer Hirnforschung 32, pp. 103-111. EMBASE

Jensen, A.R. and Sinha, S.N., 1993. Physical correlates of intelligence: A review. In: Vernon, P.A. Editor, , 1993. The Biological Basis of Intelligence Ablex, Norwood.

Jerison, H.J., 1979. The evolution of diversity in brain size. In: Hahn, M.E., Jensen, C. and Dudek, B.C. Editors, 1979. Development and Evolution in Brain Size Academic Press, New York, pp. 29-57.

Lee, A. and Pearson, K., 1901. Data for the problem of evolution in man: VI. A first study of the Correlation of the human skull. Philosophical Transactions of the Royal Society of London 196A, pp. 225-264.

Miller, E.M., 1994. Intelligence and brain myelination: A hypothesis. Personality and Individual Differences 17, pp. 803-832.

Oldfield, R.C., 1971. The assessment and analysis of handedness: The Edinburgh Inventory. Neuropsychologia 9, pp. 97-114.

Pakkenberg, N. and Gundersen, H.J.G., 1997. Neocortical number in humans: effect of sex and age. Journal of Comparative Neurology 384, pp. 312-320.

Pearlson, G.D., Kim, W.S., Kubos, K.L., Moberg, P.J., Jayaram, G., Bascom, M.J., Chase, G.A., Goldfinger, A.D. and Tune, L.E., 1989. Ventricle-brain ratio, computed tomographic density, and brain area in 50 schizophrenics.

Archieves of General Psychiatry 46, pp. 690-697. EMBASE

Peters, M., Jancke, L., Staiger, J.F., Schlaug, G., Huang, Y. and Steinmetz, H., 1998. Unsolved problems in comparing brain sizes in Homo sapiens. Brain and Cognition 37, pp. 254-285. EMBASE Elsevier BIOBASE | CrossRef

Raz, N., Torres, I.J., Spencer, W.D., Millman, D., Bertschi, J.C. and Sarpel, G., 1993. Neuroanatomical correlates of age-sensitive and age-invariant cognitive abilities. An in vivo MRI investigation. Intelligence 17, pp. 407-422.

Raz, N., Gunning, F.M., Head, D., Dupuis, J.H., McQuain, J., Briggs, S.D., Loken, W.J., Thornton, A.E. and Acker, J.D., 1997. Selective aging of the human cerebral cortex observed in vivo: differential vulnerability of the prefrontal gray matter. Cerebral Cortex 7, pp. 268-282. EMBASE | CrossRef

Rushton, J.P., 1992. Cranial capacity related to sex, rank, and race in a stratified random sample of 6,325 US military personnel. Intelligence 16, pp. 401-413.

Rushton, J.P., 1997. . Race, evolution, and behavior Transaction Publishers, New Brunswick (USA).

Rushton, J.P. and Ankney, C.D., 1996. Brain size and cognitive ability: Correlations with age, sex, social class, and race. Psychonomic Bulletin and Review 3, pp. 21-36.

Rushton, J.P and Ankney, C.D., 1997. Race and sex differences in brain size and cognitive ability. In: Tomic, W. and Kingma, J. Editors, 1997. Advances in cognition and educational practice 4 JAI Press, Greenwood, CT, pp. 25-77.

Tan, U., 1988. The distribution of hand preference in normal men and women. International Journal of Neuroscience 41, pp. 35-55.

Tan, U., 1990. Relation of hand skill to spatial reasoning in male and female left-handers with left- and right-hand writing. International Journal of Neuroscience 53, pp. 121-133.

Tan, U., 1990. Testosterone and hand performance in right-handed young adults. International Journal of Neuroscience 54, pp. 267-276.

Tan, U., 1992. Testosterone and estradiol in right-handed men but only estradiol in right-handed women is inversely correlated with the degree of right-hand preference. International Journal of Neuroscience 66, pp. 25-34.

Tan, U., Akgün, A. and Telatar, M., 1993. Relationship among nonverbal intelligence, hand speed and serum testosterone level in left-handed male subjects. International Journal of Neuroscience 71, pp. 21-28.

Wickett, J.C., Vernon, P.A. and Lee, D.H., 1994. In vivo brain size, head perimeter, and intelligence in a sample of healthy adult females. Personality and Individual Differences 16, pp. 831-838.


Repository Staff Only: item control page