A beginner’s guide to sex differences in the brain

Copy of baby brain
Donna L. Maney, Emory University

Asking whether there are sex differences in the human brain is a bit like asking whether coffee is good for you – scientists can’t seem to make up their minds about the answer. In 2013, for example, news stories proclaimed differences in the brain so dramatic that men and women “might almost be separate species.” Then in 2015, headlines announced that there are in fact no sex differences in the brain at all. Even as I write this, more findings of differences are coming out.

So which is it? Are there differences between men’s and women’s brains – or not?

What is a sex difference?

To clear up the confusion, we need to consider what the term “sex difference” really means in the scientific literature. To illustrate the concept, I’ve used a web-based tool I helped develop, SexDifference.org, to plot some actual data. The three graphs below show how measurements from a sample of people are distributed along a scale. Women are represented in pink, and men in blue. Most people are close to the average for their sex, so that’s the peak of each “bump.” People on the left or right side of the peak are below or above average, respectively, for their sex.

I’ve added individual data points for three hypothetical study subjects Sue, Ann and Bob. Not real people, just examples. Their data points are superimposed on the larger data set of hundreds of people.

Before we get into the brain, let’s look at a couple of familiar sex differences outside the brain. Many of us, if asked to describe how men’s bodies differ from women’s, would first mention the sex difference in external genitalia. The graph below depicts the number of nontransgender adults that have a “genital tubercle derivative” (clitoris or penis) of a given size.

Size of human genitalia. Data from Wallen & Lloyd, 2008. Donna Maney, CC BY-ND

All of the women in this sample, including our hypothetical Sue and Ann, fall within a certain range. All of the men, including Bob, fall into a different range. With relatively rare exceptions, humans can be accurately categorized into sexes based on this measure.

Sex difference in human height. Data from Sperrin et al., 2015. Donna Maney, CC BY-ND

Next, let’s consider another difference that we can all see and understand: the sex difference in height. Here, we see overlap, depicted in purple. Unless a person is very tall or very short, knowing only that person’s height will not allow us to categorize that person as male or female with much certainty. Yet, even though we all know that some women are taller than some men, we would probably all call this a sex difference.

A typical sex difference in the human brain. Data from Tunç et al., 2016. Donna Maney, CC BY-ND

Now let’s consider a typical sex difference inside the human brain. This graph depicts a sex difference in structural connectivity, or the degree to which networks of brain areas are interconnected, as reported in a recent study (the median effect size from the study is shown). The distributions of values for men and women are essentially the same; they overlap by 90 percent. Sue and Bob have fairly similar values, and Ann’s value is higher than the average man’s.

We can see that this sex difference in the brain is quite different from the sex difference in genital measurements. With only the measurement of brain connectivity, the odds of correctly guessing a person’s sex might be as low as 51 out of 100. Since the odds aren’t perfectly 50:50, this is technically a sex difference. The term means that sex explains a portion of the variability in a trait, not that men take one form and women another. There may be a few more women at one end of the range and a few more men at the other, but for the majority, the trait is not that related to sex.

Small differences such as this one are important. The discovery of any sex difference is valuable for scientists and physicians because it points to other, more meaningful sources of variation. Because the sexes differ according to factors such as genes, hormones, and environment, a sex difference in the brain provides clues about the impact of these other factors on the brain. Following up on those clues helps us understand why susceptibility to disease, efficacy of drugs and even the course of normal development are different among all individuals, not just between men and women.

Despite their relevance to human health, the scientific value of sex differences is rarely discussed in the news media. Instead, sex differences become clickbait for promoting stereotypes. Small differences in the brain have been reported to explain a wide variety of presumably sex-typical behaviors, from hunting to cleaning the house. Although it makes intuitive sense that a difference in the brain must translate to a difference in behavior, there is very little evidence linking any sex difference in the human brain directly to a particular function or behavioral outcome. So think twice before you assume that greater brain connectivity confers better multitasking or map-reading skills.

Do-it-yourself evaluation of sex differences

The graphs above are meant to illustrate why it’s not particularly informative to ask a yes-or-no question like “Do the sexes differ?” We need to ask more sophisticated questions: to what extent do the sexes differ? How much do they overlap?

Any decent scientific report of a sex difference contains all of the information needed to answer these questions. But not many journalists look at the actual report; they often rely on press releases, which may misrepresent the nature and meaning of a difference. As a result, the headlines can turn out to be wrong.

For example, in the 2013 study reportedly showing that men and women differ profoundly, the sexes overlapped by an average of more than 86 percent. And the 2015 study that supposedly showed no sex differences in the brain? The authors never actually made such a claim. In fact, they provided a long list of bona-fide sex differences.

The next time you read about a sex difference, if you have access to the research report you can graph the difference yourself on SexDifference.org. Enter the average value (reported as the “mean”) and variance (reported as the “standard deviation”) for each sex. The tool will automatically draw a graph and calculate the degree of overlap. You can then see for yourself the extent to which the trait is related to sex.

Don’t be surprised if you can’t find the values you need to graph the difference. The authors may not report them, or they may not have actually compared the sexes. Take, for example, the report last year on thermal comfort in office buildings. The media were aflutter for days, explaining why women are always cold at the office. A quick look at the scientific paper itself shows that there were no men in the study at all! This makes calculating the overlap a bit problematic.

Why overlap matters

Overlap between the sexes may seem so obvious that it needs no discussion. But its underappreciation is leading educators to separate boys and girls into single-sex classrooms in order to accommodate their different brains, and physicians to consider sex, instead of more relevant factors such as body weight, when prescribing drugs. Although well-intentioned, these practices amount to stereotyping because they assume the distribution looks like the top graph above when it may look more like the bottom one.

Nearly every day, new research is published that, if overinterpreted, could be used to promote sex stereotypes. Most neuroscientists are not interested in doing that. The few neuroscientists who do overinterpret their data, often to the great delight of the media and the public, provide fuel for discriminatory practices and cast the entire field in a negative light. The best way to deal with dubious interpretations is to examine the data and draw our own conclusions. The data will speak for themselves.

Donna L. Maney, Professor of Psychology, Emory University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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1 Comment

  1. TOM MCKERNAN on February 13, 2021 at 2:03 pm

    I’m the father of two children. My first child was a girl and my second child a boy. Contrary to popular beliefs about parenting my children, I assumed the position of being their student. This status grew into reality as I recognised that many my former beliefs about parenting were toxic rubbish.
    Whilst my odd parenting stand lead to discovering that from a child’s perspective, all parents really validate their children. Yes, these actions of validation are far more important than food, clothing and other health/protective matters. You can make up your your mind about what ought to be most important, if raising kids rocks your boat.
    I did it my way and hear is the drum about authentic validation of children. From day one to when they leave your home, your opportunities to validate each child diminish. Initially your child is almost totally dependent upon you for everything. Not to be ignored, their need for validation is a matter of life, or death. Everything that you do with baby is interpritated a validation, by baby. I expect you know alot about the stages of growth in babies, but did you know that babies can and do stop seeking validation form parent? I think this occurs when a parent viers away from healthy parenting?
    Your baby/child will seek your validation at an ever diminishing rate. Once validated as being good at this matter, child has completed that need. Let’s leap forward to toddler seeking validation time. You may believe that you are disciplining each child/young adult? What you are actually doing is domination, [for their good???] When your child wants you to validate something about themself, you will be approach and asked directly. For example, when my daughter asked what I thought of her kinder school painting, I saw this as a validation opportunity. I told her it was an awesome painting. Loved the colours and the set out. Wow, your a great painter.’
    In my mind it was messy and a very childish effort. So, who’s opinion counts here, mine, or my daughters? Neither! It was pure validate me as a painter, dad.
    An example of old child validation happened to me. My daughter stood with two of her schools friends, prepared to have a picture taken. These three ladies were all dressed for their first school dance and daughter asked me, ‘How do we look?’. [that was a validate me question]. I said, ‘you look beautiful and very attractive’.
    Validation requests covery multiple topics. Good parenting beliefs must include your validation skills. Look for any opportunity to validate those whom you love and do it. Sure, you may discover your own neglected validations, from your past? Take this as an opportunity to change your mind about seeking out validation from other people.
    Some people run a my mom, or dad told me I was bad, useless, clumsy, dumb, or whatever. That’s just lies and rotten validation which needs your pure heart to fix. Unlike kids that just want to be needed, be aware that some part of you is selecting people to validate something inside, or about you. Take care whom you ask and know that you will get better at finding validators with practice.

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About Dr Sarah

I’m an Oxford University-educated neuroscientist, presenter of ABC Catalyst, director of The Neuroscience Academy, and author of The Women's Brain Book. The neuroscience of health, hormones and happiness.

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