Datafile Name: Brain size
Datafile Subjects: Medical
Story Names: Brain Size and Intelligence
Reference: Willerman, L., Schultz, R., Rutledge, J. N., and Bigler, E.
(1991), "In Vivo Brain Size and Intelligence," Intelligence, 15, 223-228.
Authorization: Contact authors

Description: 

Willerman et al. (1991) collected a sample of 40 right-handed
Anglo introductory psychology students at a large southwestern university.
Subjects took four subtests (Vocabulary, Similarities, Block Design, and
Picture Completion) of the Wechsler (1981) Adult Intelligence Scale-Revised.
The researchers used Magnetic Resonance Imaging (MRI) to determine the brain
size of the subjects. Information about gender and body size (height and
weight) are also included. The researchers withheld the weights of two
subjects and the height of one subject for reasons of confidentiality.

Number of cases: 40
Variable Names:

  1. Gender: Male or Female
  2. FSIQ: Full Scale IQ scores based on the four Wechsler (1981) subtests
  3. VIQ: Verbal IQ scores based on the four Wechsler (1981) subtests
  4. PIQ: Performance IQ scores based on the four Wechsler (1981) subtests
  5. Weight: body weight in pounds
  6. Height: height in inches
  7. MRI_Count: total pixel Count from the 18 MRI scans

The Data:

Gender  FSIQ    VIQ     PIQ     Weight  Height  MRI_Count
Female  133     132     124     118     64.5    816932
Male    140     150     124       .     72.5   1001121
Male    139     123     150     143     73.3   1038437
...
Male     81      90      74     148     74.0    930016
Male     89      91      89     179     75.5    935863