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Carnegie Mellon University
NPR Health
Math Looks The Same In The Brains Of Boys And Girls, Study Finds
Jon Hamilton
November 8, 2019
There's new evidence that girls start out with the same math abilities as boys.
A study of 104 children from ages 3 to 10 found similar patterns of
brain activity in boys and girls as they engaged in basic math tasks,
researchers reported Friday in the journal Science of Learning.
"They are indistinguishable," says Jessica Cantlon, an author of the
study and professor of developmental neuroscience at Carnegie Mellon
University.
The finding challenges the idea that more boys than girls end up in
STEM fields (science, technology, engineering and mathematics) because
they are inherently better at the sort of thinking those fields
require. It also backs other studies that found similar math abilities
in males and females early in life.
"The results of this study are not too surprising because typically we
don't see sex differences at the ages assessed in this study or for the
types of math tasks they did, which were fairly simple," says David
Geary, a psychologist and curators' distinguished professor at the
University of Missouri who was not involved in the research.
But there is evidence of sex differences in some exceptional older students, Geary says.
For example, boys outnumber girls by about 3 to 1 when researchers
identify adolescents who achieve "very, very high-end performance in
mathematics," Geary says, adding that scientists are still trying to
understand why that gap exists.
The new study came from earlier research by Cantlon that found boys and
girls as old as 8 had similar abilities when it came to perceiving
numbers and grasping elementary mathematics concepts.
That research showed how kids behaved, but not what was going on in their brains, Cantlon says.
So she and a team of scientists studied children as they engaged in
math tasks while lying in a magnetic resonance scanner that monitored
activity throughout the brain. The children watched an educational
video that included clips from Sesame Street and covered math topics
such as counting and addition as well as reading topics for comparison.
The researchers found that in kids, just like adults, math activities
create a lot of activity in the intraparietal sulcus, a brain area
involved in estimating the number of objects in a group, processing
number words, and performing addition and subtraction.
And that activity was remarkably similar in boys and girls, Cantlon
says. In fact, "you can't tell one group from the other," she says.
The researchers also found that boys and girls were equally engaged in
watching the video and that brain maturity did not vary by gender. (The
new study refers to gender rather than sex because researchers relied
on parents' reports of a child's gender rather than chromosome tests.)
Finally, a standardized test of mathematics ability found no difference between boys and girls.
So why are fields like mathematics and computer science so dominated by men?
Cantlon suspects the answer involves the societal messages girls and
young women get, and the difficulty of entering a field that includes
very few women. "You can look at ratios of women and men participating
in different activities and you can get the hint," she says.
But Geary says an international study he did with Gijsbert Stoet at the University of Essex suggests a different explanation.
Using an international database on adolescent achievement in science,
mathematics and reading, they found that in two-thirds of all
countries, female students performed at least as well as males in
science.
Yet paradoxically, females in wealthier countries with more gender
equality, including the U.S., were less likely than females in other
countries to get degrees in fields such as math and computer science.
Geary thinks the reason may be that women in these countries are under
less pressure to choose a field that promises an economic payback and
have more freedom to pursue what interests them most.
Also, males may be more likely to choose science because they are less
likely than females to have strong reading, writing and language
skills, Geary says.
A study of gender achievement gaps in U.S. schools found that the gaps
varied widely depending on whether the school was in a wealthy area.
When all school districts are pooled together, "there isn't really a
gender achievement gap in math, but there is in reading," says Erin
Fahle, an assistant professor at St. John's University and an author of
the gender gap study. Males were about two-thirds of an academic year
behind females, she says.
But when the researchers focused on more affluent school districts, "boys tended to do better than girls in math," Fahle says.
That research, along with the new study, makes a compelling case that
factors other than biological differences explain why girls are less
likely to pursue degrees and jobs in math and science, she says.
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