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VCU STUDY SHOWS BIG-BRAINED PEOPLE
ARE SMARTER RICHMOND, VA. (June 17, 2005) – People with bigger brains are smarter than
their smaller-brained counterparts, according to a study conducted by a Virginia
Commonwealth University researcher published in the journal “Intelligence.”
The study, published on line June 16, could settle a long-standing scientific
debate about the relationship between brain size and intelligence. Ever since
German anatomist and physiologist Frederick Tiedmann wrote in 1836 that there
exists “an indisputable connection between the size of the brain and the mental
energy displayed by the individual man,” scientists have been searching for
biological evidence to prove his claim.
“For all age and sex groups, it is now very clear that brain volume and
intelligence are related,” said lead researcher Michael A. McDaniel, Ph.D., an
industrial and organizational psychologist who specializes in the study of
intelligence and other predictors of job performance.
The study is the most comprehensive of its kind, drawing conclusions from 26
previous – mostly recent – international studies involving brain volume and
intelligence. It was only five years ago, with the increased use of MRI-based
brain assessments, that more data relating to brain volume and intelligence
became available.
McDaniel, a professor in management in VCU’s School of Business, found that,
on average, intelligence increases with increasing brain volume. Intelligence
was measured with standardized intelligence tests, which have important
consequences on peoples' lives, such as where they’ll go to college or what
kind of job they get. Critics have called the tests inaccurate or irrelevant to the
real world, he said.
“But when intelligence is correlated with a biological reality such as brain
volume, it becomes harder to argue that human intelligence can’t be measured
or that the scores do not reflect something meaningful,” said McDaniel.
As an industrial and organizational psychologist, McDaniel works with employers
to screen job applicants and measure their performance. He said employers will
appreciate his findings because intelligence tests are the single best predictor
of job performance.
“On average, smarter people learn quicker, make fewer errors, and are more
productive,” McDaniel said. “The use of intelligence tests in screening job
applicants has substantial economic benefits for organizations.”
Before MRIs, scientists often used external skull measurements or waited until
a person died to estimate brain size. The external skull measurements were
only approximate estimates of brain volume.
For a copy of the study please go to http://www.vcu.
edu/uns/Releases/2005/june/McDaniel-Big%20Brain.pdf. If you need a fax copy,
please contact University News Services at (804) 828-1231.
About VCU and the VCU Medical Center: Located on two downtown campuses in Richmond, Va., Virginia Commonwealth University is ranked nationally by the Carnegie Foundation as a top research institution and enrolls more than 28,500 students in more than 181 certificate, undergraduate, graduate, professional and doctoral programs in the arts, sciences and humanities in 15 schools and one college. Forty of the university’s programs are unique in Virginia, and 20 graduate and professional programs have been ranked by U.S. News & World Report as among the best of their kind. MCV Hospitals, clinics and the health sciences schools of Virginia Commonwealth University compose the VCU Medical Center, one of the leading academic medical centers in the country. For more, see www.vcu.edu.
About VCU and the VCU Medical Center: Located on two downtown campuses in Richmond, Va., Virginia Commonwealth University is ranked nationally by the Carnegie Foundation as a top research institution and enrolls more than 28,500 students in more than 181 certificate, undergraduate, graduate, professional and doctoral programs in the arts, sciences and humanities in 15 schools and one college. Forty of the university’s programs are unique in Virginia, and 20 graduate and professional programs have been ranked by U.S. News & World Report as among the best of their kind. MCV Hospitals, clinics and the health sciences schools of Virginia Commonwealth University compose the VCU Medical Center, one of the leading academic medical centers in the country. For more, see www.vcu.edu.
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