Willerman et al. (1991) conducted their study at a large southwestern university. They selected a sample of 40 right-handed Anglo introductory psychology students who had indicated no history of alcoholism, unconsciousness, brain damage, epilepsy, or heart disease. These subjects were drawn from a larger pool of introductory psychology students with total Scholastic Aptitude Test Scores higher than 1350 or lower than 940 who had agreed to satisfy a course requirement by allowing the administration of four subtests (Vocabulary, Similarities, Block Design, and Picture Completion) of the Wechsler (1981) Adult Intelligence Scale-Revised. With prior approval of the University's research review board, students selected for MRI were required to obtain prorated full-scale IQs of greater than 130 or less than 103, and were equally divided by sex and IQ classification.
data("BrainIQ")A data frame with 40 individuals and the following 7 variables.
GenderParticipant's gender.
FSIQFull Scale IQ.
VIQVerbal IQ.
PIQPerformance IQ.
WeightBody weight.
HeightBody height.
MRI_CountMRI pixel count (brain size).
# NOT RUN {
data(BrainIQ)
str(BrainIQ)
# }
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