Tag Archives: biology

How Many PhDs are Professors?

When I approached my undergraduate mentors about graduate school in 1996, they warned me that many people who earn PhDs never get jobs in academia.  This is sometimes deliberate, as their are jobs outside of academia for some degree-holders to get, but it’s also sometimes a grave disappointment.  My mentors emphasized the extent of the risk (and frankly scared me quite a lot), but how bad was it?  And is it worse today?

The Atlantic‘s Jordan Weissmann put together the data.  The leftmost bars on his figure show that, on average, under a quarter of PhDs landed a full-time job at a college or university in 1991.  That number had dropped to less than 20% by 2011.  The numbers, however, vary significantly by field:

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See here for more details.

The looming question, of course, is what percentage of PhDs want a full-time academic job, something that certainly varies by field.  In other words, there aren’t a boatload of bitter engineers bad-mouthing the academy while slinging lattes at Starbucks.  Here’s a hint at an answer: A study published in 1999 found that 53% of all new PhDs said they wanted to become professors.  Ten years later, just over half were tenured (54%) and a handful more were tenure-track (7%); a third weren’t in academia at all.

On the one hand, I think these numbers are really depressing. Five to ten years is a long time to train for a career only to discover that, for whatever reason, you won’t be employed in the area of your expertise.  But I have two “on the other hands.”

On one other hand, I wonder how these numbers compare to other occupations?  We accept that certain occupations are highly competitive and include a lot of dumb luck and failure.  Modeling and acting are obvious examples, there are certainly others.  I know someone who’s spent their lifetime trying to become an astronaut.  Where does academia fall in the spectrum of risky job endeavors?

On a second other hand, I’d love to see some research on what happens to academics — especially in the humanities and social sciences — when they don’t get a job in academia or are denied tenure after getting there.  Within academia, this is often framed as THE END OF YOUR LIFE.  But maybe it’s often okay or pretty good.  Honestly, I don’t know.

Interesting and useful data, to be sure, but far from the whole story.

Lisa Wade is a professor of sociology at Occidental College and the author of Gender: Ideas, Interactions, Institutions, with Myra Marx Ferree. You can follow her on Twitter and Facebook.

Men Throwing “Like a Girl”: Separating Nature from Nurture

Screenshot_5One of the few genuinely large observed differences between men and women involves throwing ability.  Men, on average, are much stronger throwers than women.  Hence the phrase “throws like a girl.”

That we observe a difference, however, tells us nothing about where that difference comes from.  Figuring that out is much more difficult than simply measuring difference and sameness.  We know that the difference emerges at puberty, suggesting that sheer size might have something to do with it.  But the fact that boys and men, on average, get much more practice throwing than women might also play a role.  How to test this?

Well, here’s one way: compare men and women throwing with their non-dominant hand.  Muscle memory doesn’t transfer from one side of the body to the other.  Accordingly, since most people have a lot of practice throwing only with one hand, comparing the throws of men and women using their non-dominant hand might tell us something interesting.

I don’t know that that study has been done, but an enterprising videographer has captured video of a set of men throwing with the “wrong” hand. What I like most about the video is the men’s facial expressions.  You can see them laughing at themselves, suddenly reduced to a beginner thrower.  Though we still don’t know how much of it is biological and how much social — though, this is the wrong question anyway – it reveals that, no matter what the answer, men’s throwing ability is strongly related to practice:

A big thanks to Reynaldo C. for sending in the video!

Cross-posted at BlogHer.

Lisa Wade is a professor of sociology at Occidental College and the author of Gender: Ideas, Interactions, Institutions, with Myra Marx Ferree. You can follow her on Twitter and Facebook.

Racialized Representations of Evolution

For the last week of December, we’re re-posting some of our favorite posts from 2012.

Paul M. sent along the image below, from an NPR story, commenting on the way skin color is used in the portrayal of evolution.  There’s one obvious way to read this graphic: lighter-skinned people are more evolved (dare we say, “civilized”) than darker-skinned people.  (The portrayal of fatness and its relevance to evolutionary fitness is another story in this particular graphic, as is the use of men and not women to represent humanity).

It seemed worthy to make a point of Paul’s observation, because this racialized presentation of evolution is really common.  A search for the word on Google Images quickly turns up several more.  In fact, almost every single illustration of evolution of this type, unless it’s in black and white, follows this pattern.  (See also our post on representations of modern man.)


This is important stuff.  It reinforces the idea that darker-skinned people are more animalistic than the lighter-skinned.  It also normalizes light-skinned people as people and darker-skinned peoples as Black or Brown people, in the same way that we use the word “American” to mean White-American, but various hyphenated phrases (African-American, Asian-American, etc) to refer to everyone else.  So, though this may seem like a trivial matter, the patterns add up to a consistent centering and applauding of Whiteness.

Lisa Wade is a professor of sociology at Occidental College and the author of Gender: Ideas, Interactions, Institutions, with Myra Marx Ferree. You can follow her on Twitter and Facebook.

Gaydar Study Calibration

For the last week of December, we’re re-posting some of our favorite posts from 2012. Originally cross-posted at Family Inequality.

The other day the New York Times had a Gray Matter science piece by the authors of a study in PLoS One that showed some people could identify gays and lesbians based only on quick flashes of their unadorned faces. They wrote:

We conducted experiments in which participants viewed facial photographs of men and women and then categorized each face as gay or straight. The photographs were seen very briefly, for 50 milliseconds, which was long enough for participants to know they’d seen a face, but probably not long enough to feel they knew much more. In addition, the photos were mostly devoid of cultural cues: hairstyles were digitally removed, and no faces had makeup, piercings, eyeglasses or tattoos.

…participants demonstrated an ability to identify sexual orientation: overall, gaydar judgments were about 60 percent accurate.

Since chance guessing would yield 50 percent accuracy, 60 percent might not seem impressive. But the effect is statistically significant — several times above the margin of error. Furthermore, the effect has been highly replicable: we ourselves have consistently discovered such effects in more than a dozen experiments.

This may be seen as confirmation of the inborn nature of sexual orientation, if it can be detected by a quick glance at facial features.

Sample images flashed during the “gaydar” experiment:

There is a statistical issue here that I leave to others to consider: the sample of Facebook pictures the researchers used was 48% gay/lesbian (111/233 men, 87/180 women). So if, as they say, it is 64% accurate at detecting lesbians, and 57% accurate at detecting gay men, how useful is gaydar in real life (when about 3.5% of people are gay or lesbian, when people aren’t reduced to just their naked, hairless facial features, and you know a lot of people’s sexual orientations from other sources)? I don’t know, but I’m guessing not much.

Anyway, I have a serious basic reservation about studies like this — like those that look for finger-lengthhair-whorltwin patterns, and other biological signs of sexual orientation. To do it, the researchers have to decide who has what sexual orientation in the first place — and that’s half the puzzle. This is unremarked on in the gaydar study or the op-ed, and appears to cause no angst among the researchers. They got their pictures from Facebook profiles of people who self-identified as gay/lesbian or straight (I don’t know if that was from the “interested in” Facebook option, or something else on their profiles).

Sexual orientation is multidimensional and determined by many different things — some combination of (presumably many) genes, hormonal exposures, lived experiences. And for some people at least, it changes over the course of their lives. That’s why it’s hard to measure.

Consider, for example, a scenario in which someone who felt gay at a young age married heterogamously anyway — not too uncommon. Would such a person self-identify as gay on Facebook? Probably not. But if someone in that same situation got divorced and then came out of the closet they probably would self-identify as gay then.

Consider another new study, in the Archives of Sexual Behavior, which used a large sample of people interviewed 10 years apart. They found changes in sexual orientation were not that rare. Here is my table based on their results:Overall, 2% of people changed their response to the sexual orientation identity question. That’s not that many — but then only 2.5% reported homosexual or bisexual identities in the first place.

In short, self identification may be the best standard we have for sexual orientation identity (which isn’t the same as sexual behavior), but it’s not a good fit for studies trying to get at deep-down gay/straight-ness, like the gaydar study or the biological studies.

And we need to keep in mind that this is all complicated by social stigma around sexual orientation. So who identifies as what, and to whom, is never free from political or power issues.

Philip N. Cohen is a professor of sociology at the University of Maryland, College Park, and writes the blog Family Inequality. You can follow him on Twitter or Facebook.

The Truth About “Pink” and “Blue” Brains

Cross-posted at Ms. and the Huffington Post.

I loathe to weigh in on the “war on men” conversation, but… alas.

While one can use both logic and data to poke gaping holes in Suzanne Venker’s argument that women need to surrender to their femininity and let men think that they’re in charge if they ever want to get married, I just want to point out one thing — one endlessly repeated thing — that she gets very, very wrong.

Venker claims that there has “been an explosion of brain research” that proves that men and women have different brains.  This research, she claims, shows that men are loners who like to hunt and build things and women are nurturers who like to talk and take care of people.

This false on two fronts.

First, she’s wrong about the brain research.  The books and articles claiming that there are “pink” and “blue” brains are not consistent with existing research.  (They are out there because people can make a lot of money by confirming other people’s biases.)

What does the research say?

It’s true that scientists have documented a number of small, average sex differences in brain anatomy, composition, and function, as well as differences in size and tissue ratios.  (Other differences — such as the size of the corpus callosum and lateralization, whether one sex uses one side of their brain more than the other — have proven to be wrong.)

So, scientists do find some differences, but they have largely failed to link these to differences in men’s and women’s observed emotions, cognition,  or behavior.  That is, we’ve found some differences, but we have no proof that they translate into anything. Moreover, new research suggests that differences we observe may be designed not to create differences between men and women, but to reduce them.  The brain may have two strategies for achieving the same outcome or one difference may compensate for another.  (For more, see Brain Gender by Melissa Hines.)

That’s one reason why Venker is wrong.

The second reason is even more damning.  Most of the research attempting to explain gender difference assumes that there differences to explain.   In fact, meta-analyses aimed at summarizing the literature on human sex differences and similarities in traits, personality, cognitive abilities, sexuality, temperament, and motor skills offer better evidence for similarity than difference.  On the vast majority of traits, men and women overlap tremendously.

Janet Hyde, a pioneer in this area, did a meta-analysis of meta-analyses that combined the results of 7,084 separate studies. She found evidence for a large or very large difference on 8% of characteristics and evidence for medium-sized differences on 15%.  She found evidence for small differences on another 48%.  What does a small difference look like?  Here’s an example of a mid-range small difference (for self-esteem):

For the final 30% of characteristics, she found no evidence gender difference.  So, on 78% of characteristics, she found teensy differences or none at all.  Wow, “opposite sexes” indeed.

The truth is, men aren’t loners and women aren’t talkers. Venker assumes the stereotypes and counts on her readers to agree that they are true, but the data doesn’t back her up.

Two excellent books summarize the debates over gender and neuroscience.  Cordelia Fine’s Delusions of Gender is great for a beginner. She’s funny and you’ll learn a lot. Rebecca Jordan-Young’s Brain Storm is great for someone who wants and intermediate to advanced introduction to these issues.  Her book is downright brilliant.  I highly recommend both.

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Lisa Wade is a professor of sociology at Occidental College.  Feel free to take a look at her forthcoming article, “The New Science of Sex Difference.”  You can also follow her on Twitter and Facebook.

Neurology, Racism, and Exposure to Diversity

New neurological research, reported by Robert Wright at The Atlantic, suggests that racism is learned.  Earlier studies had shown that the amygdala, “a brain structure associated with emotion and, specifically, with the detection of threats,” is active, on average, when White people see Black faces.

A new paper, however, led by Eva Telzer, shows that we don’t see this reaction until about age 14. Moreover,  how powerfully it is after the age of 14 depends on the racial composition of your peer group.  White people who grow up in more diverse environments show a much weaker reaction than those in homogeneous ones.

This figure illustrates the difference.  As peer diversity increases, reaction of the amygdala retreats to zero.

This is what it means, Wright explains, to say that race is a social construct:

It’s not a category that’s inherently correlated with our patterns of fear or mistrust or hatred, though, obviously, it can become one. So it’s within our power to construct a society in which race isn’t a meaningful construct.

For lots of examples of why race is socially constructed, see our Pinterest board on the topic.

And, for other super cool stories about biology, see language, culture, and color; a story of human echolocation; human brain synchronicity; and men with higher voices have higher sperm counts.

Originally posted in 2012. Re-posted in solidarity with the African American community; regardless of the truth of the Martin/Zimmerman confrontation, it’s hard not to interpret the finding of not-guilty as anything but a continuance of the criminal justice system’s failure to ensure justice for young Black men.

Lisa Wade is a professor of sociology at Occidental College and the author of Gender: Ideas, Interactions, Institutions, with Myra Marx Ferree. You can follow her on Twitter and Facebook.

Human Brain Synchronicity: The Body as Dependent Variable

The mass media often enjoys stoking the fires of the “nature/nurture debate,” an argument between those who believe that human behavior is largely inborn (nature) and those who believe it is largely learned (nurture).  In fact, most scholars reject this forced choice in favor of the idea that nature and nurture are forces that shape each other.

In this view, biology is both an independent and a dependent variable.  That is, it acts on us in ways that shape our interactions with others (such that behavior is dependent on biology) and our interactions with others shape our biology (such that our biology is dependent on our behavior).  I’ve published professionally on this topic and we’ve previously posted examples involving the socio-genetic causation of psychopathythe response of testosterone levels to political victories, and the historical shift in the average age of menstruation.

Today’s example comes from an fMRI study of emotion.  They discovered that, when we watch others experience emotions, our brains sync up with theirs.  Our bodies, in other words, strongly react to environmental stimuli.  This, argues one of the researchers, “…facilitates understanding others’ intentions and actions… [as well as] social interaction and group processes.”

It may seem obvious that our neural activity would respond to our environments, but I think it bears emphasizing.  It is too easy for us, in a society that seems eager for a biological explanation for everything, to ignore the ways in which the body is a dependent variable as well as an independent one.  In many ways it makes sense to think of our biologies as the matter through which social interaction occurs.  In other words, while we often think of society as the medium for the transmission of genes, I also like to think of biology as the medium for the transmission of society.

Lisa Wade is a professor of sociology at Occidental College and the author of Gender: Ideas, Interactions, Institutions, with Myra Marx Ferree. You can follow her on Twitter and Facebook.

Language, Culture, and Color: A Visit with the Himba

Earlier this week I wrote a post asking Is the Sky Blue?, discussing the way that culture influences our perception of color.  In the comments thread Will Robertson linked to a fascinating 8-minute BBC Horizon clip.  The video features an expert explaining how language changes how children process color in the brain.

We also travel to Namibia to visit with the Himba tribe.  They have different color categories than we do in the West, making them “color blind” to certain distinctions we easily parse out, but revealing ways in which we, too, can be color blind.

Lisa Wade is a professor of sociology at Occidental College and the author of Gender: Ideas, Interactions, Institutions, with Myra Marx Ferree. You can follow her on Twitter and Facebook.