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# Instances: 20 / # Attributes: 9
HDF5 (14.8 KB) XML CSV ARFF LibSVM Matlab Octave

Original Data Format

arff

Name

iq_brain_size

Version mldata

0

Comment

Relationship between IQ and Brain Size

Summary: Monozygotic twins share numerous physical, psychological, and pathological traits. Recent advances in in vivo brain image acquisition and analysis have made it possible to determine quantitatively whether: 1) twins share neuroanatomical traits; and 2) neuroanatomical measures correlate with brain size. Using magnetic resonance imaging and computer-based image analysis techniques, measurements of the volume of the forebrain, the surface area of the cerebral cortex and the mid-sagittal area of the corpus callosum were obtained in 10 pairs of monozygotic twins. Head circumference, body weight, and Full-Scale IQ were also measured. Analyses of variance were carried out using genotype, birth order, and sex, as between-subject factors. Pearson correlation coefficients were computed to assess the interrelationships between brain measures, head circumference, and IQ. Effects of genotype (but not of birth order) were found for total forebrain volume, total cortical surface area, and callosal area. Consistent with previous twin studies, highly significant effects of genotype but not birth order were also found for head circumference, body weight, and Full-Scale IQ. The significant effect of genotype on all measures was not attributable to sex differences across unrelated twin pairs. Significant correlations were observed between forebrain volume, cortical surface area, and callosal area as well as between each brain measure and head circumference. No correlation between IQ and any other measure was found.
Monozygotic twins share similarities in forebrain volume, cortical surface area, and callosal area. Brain measures are highly correlated with one another and with head circumference, but none is correlated with IQ.

Authorization: Contact Authors

Reference: Tramo MJ, Loftus WC, Green RL, Stukel TA, Weaver JB, Gazzaniga MS. Brain Size, Head Size, and IQ in Monozygotic Twins. Neurology 1998; 50:1246-1252.

Description: This datafile contains 20 observations (10 pairs of twins) on 9 variables. This data set can be used to demonstrate simple linear regression and correlation.

Variable Names in order from left to right: CCMIDSA: Corpus Collasum Surface Area (cm2) FIQ: Full-Scale IQ HC: Head Circumference (cm) ORDER: Birth Order PAIR: Pair ID (Genotype) SEX: Sex (1=Male 2=Female) TOTSA: Total Surface Area (cm2) TOTVOL: Total Brain Volume (cm3) WEIGHT: Body Weight (kg)

Therese Stukel Dartmouth Hitchcock Medical Center One Medical Center Dr. Lebanon, NH 03756 e-mail: stukel@dartmouth.edu

Information about the dataset CLASSTYPE: numeric CLASSINDEX: 2

Names

CCMIDSA,FIQ,HC,ORDER,PAIR,SEX,TOTSA,TOTVOL,WEIGHT,

Types

1. numeric
2. numeric
3. numeric
4. nominal:1,2
5. nominal:1,2,3,4,5,6,7,8,9,10
6. nominal:Female,Male
7. numeric
8. numeric
9. numeric

Data (first 10 data points)

CCMI...	FIQ	HC	ORDER	PAIR	SEX	TOTSA	TOTVOL	WEIGHT
6.08	96	54.7	1	1	Female	1913...	1005	57.607
5.73	89	54.2	2	1	Female	1684...	963	58.968
6.22	87	53.0	1	2	Female	1902...	1035	64.184
5.8	87	52.9	2	2	Female	1860...	1027	58.514
7.99	101	57.8	1	3	Female	2264...	1281	63.958
8.42	103	56.9	2	3	Female	2216.4	1272	61.69
7.44	103	56.6	1	4	Female	1866...	1051	133....
6.84	96	55.3	2	4	Female	1850...	1079	107....
6.48	127	53.1	1	5	Female	1743...	1034	62.143
6.43	126	54.8	2	5	Female	1709.3	1070	83.009
...	...	...	...	...	...	...	...	...

Description

A gzip'ed tar containing StatLib datasets (statlib-20050214.tar.gz, 12,785,582 Bytes)

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revision 1

by mldata on 2010-11-06 10:00

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