Spot the snakes!

October 19, 2015 • 3:01 pm

by Greg Mayer

Late this past summer, I caught a brown snake (Storeria dekayi) at the Root River Environmental Center in Racine, Wisconsin, so that the REC (as it’s known) could put it on display in a terrarium for visitors to see. Although I did not realize it, it was a pregnant female, and she gave birth to a litter of babies within a week. On September 27, the REC staff and I liberated the mother and her offspring behind the building, just a few yards from where the female had been captured. Can you spot the babies? And, how many of them are there?

Baby brown snakes (Storeria dekayi), being released at the REC, Racine, WI, 27 September 2015.
Baby brown snakes (Storeria dekayi), being released at the REC, Racine, WI, 27 September 2015.

Brown snakes feed on earthworms and slugs, and there was an abundant supply at the REC. Here’s a video the staff made of one of the babies feeding on a garden slug.

This is where we released them; the mother was caught about 10 feet to the right of the picture. (The grass and weeds around the spot I caught her had been trimmed, so we released them in denser cover.)

Snake (and slug) habitat behind the REC building, Racine, WI.
Snake (and slug) habitat behind the REC building, Racine, WI.

For the snake counting, we can distinguish an easier headcount (i.e., count them only if you can see their heads), from the total count. Answers, of a sort, in a couple of days.

Does disbelief in free will make people cheat?

October 19, 2015 • 12:15 pm

I’ve posted before about Greg Caruso, a philosophy professor who writes about the down side of believing in free will, including its support of a “just world” view in which people deserve what they get, and so shouldn’t get government help. (Many Republicans hold such a view.) Caruso’s also the author of Free Will and Consciousness: A Determinist Account of the Illusion of Free Will, as well as Science and Religion: 5 Questionsbooks that are on my on my reading list.

Caruso continues his exploration of the social consequences of believing in free will in a new article in Psychology Today, “Does Disbelief in Free Will Increase Anti-Social Behavior?”  The answer has long been “yes,” but that was based on a single article by Vohs and Schooler (reference below), showing that if you “primed” students with readings that either reinforced or denigrated free will, they were more likely to cheat on a subsequent computer test when primed against free will.

The problem with that study is that two attempts to replicate it have failed. One has yet to be published (see here), while the other was part of the recent and widely-cited study in which psychologists replicated 100 experiments published in respected journals. One of the many failures to replicate involved Vohs’ and Schooler’s 2008 paper (see here).

Caruso’s column points out these failures, adds another failure to replicate, and notes other methodological flaws in the Vohs and Schooler paper:

While [Vohs and Schooler’s] findings appear to support concerns over the anti-social consequences of relinquishing free will belief, I advise caution in drawing any universal or sweeping conclusions from them. There are powerful criticisms of the methodology of these studies that put into doubt the supposed connection between disbelief in free will and any long-term increase in anti-social behavior. First of all, the passages used to prime disbelief in free will appear to be priming the wrong thing. Several critics have noted that instead of priming belief in hard determinism or hard incompatibilism (the view that free will is incompatible with determinism and indeterminism), the Crick excerpt subjects read [the anti-free-will prime] is actually priming a scientific reductionist view of the mind, one that is proclaimed to demonstrate that free will is an illusion. Free will skepticism, however, need not entail such a reductionist view and the priming passages may be giving participants the mistaken impression that scientists have concluded that their beliefs, desires, and choice are causally inefficacious—a claim not embraced by most philosophical skeptics.

Secondly, subsequent studies have had a difficult time replicating these findings. Some readers may be familiar with the recent unprecedented attempt to replicate 100 studies published in three of the top psychology journals. Surprisingly, the Reproducibility Project was only able to replicate 35 out of the 100 studies and one of the studies that failed to replicate was the Vohs and Schooler—as highlighted in this recent New York Times article. This, however, was not the first time there have been difficulties replicating these findings. Rolf Zwaan at the University of Rotterdam, for example, attempted to replicate the findings but was unable to do so (see here). Eddy Nahmias and Thomas Nadelhoffer also attempted to replicate the findings and, as Nahmias describes their difficulties (here), “the effects don’t always replicate and they only seem to work with the over-the-top primes that suggest all kinds of threats to agency.” He goes on to say, “no one has shown that telling people they lack just what philosophical…skeptics say they lack and nothing more has any bad effects on behavior or sense of meaning.”

I wasn’t aware of Nahmias and Thomas’s “failure to replicate” (it’s described in a comment by Nahmias on a blog post by Caruso), but it’s good of Nahmias to mention that, as he’s been a big proponent of free will, at least of the compatibilist form.

But let us no longer claim that we have to believe in free will because experiments have shown that it makes us cheat. Even if that were true, cheating on a computer test given immediately after a real prime demonstrates only short-term effects, not ones that last longer than a few hours. Just as we don’t need the illusion of God to be moral, so we don’t need the illusion of free will (or some jerry-rigged compatibilist version) to be honest.

It’s sad, then, that some people still adhere to the belief that we should tell people fictions so they will behave properly. One of those people is described by Caruso:

Saul Smilansky, for example, maintains that our commonplace beliefs in libertarian free will and desert-entailing ultimate moral responsibility are illusions, but he also maintains that if people were to accept this truth there would be wide-reaching negative intrapersonal and interpersonal consequences. According to Smilansky, “Most people not only believe in actual possibilities and the ability to transcend circumstances, but have distinct and strong beliefs that libertarian free will is a condition for moral responsibility, which is in turn a condition for just reward and punishment.” It would be devastating, he warns, if we were to destroy such beliefs: “the difficulties caused by the absence of ultimate-level grounding are likely to be great, generating acute psychological discomfort for many people and threatening morality—if, that is, we do not have illusion at our disposal.” To avoid any deleterious social and personal consequences, then, and to prevent the unraveling of our moral fabric, Smilansky recommends free will illusionism. According to illusionism, people should be allowed their positive illusion of libertarian free will and with it ultimate moral responsibility; we should not take these away from people, and those of us who have already been disenchanted ought to simply keep the truth to ourselves.

That’s the Little People Argument, and it’s condescending and dishonest. (Note that Smilansky is recommending genuine lying: telling people—or not dispelling their misconception—that they have dualistic, libertarian free will.) The best strategy, I think, is to tell people the truth about reality, and then convince them why they still shouldn’t lie, cheat, or exercise retributive punishment.

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Vohs, Kathleen D., and Jonathan W. Schooler. 2008. The value of believing in free will: Encouraging a belief in determinism increases cheating(link is external). Psychological Science 19:49-54.

 

Was Darwin lactose-intolerant?

October 19, 2015 • 11:56 am

by Matthew Cobb

The other week I gave a talk at the Ilkley Literature Festival, about my book Life’s Greatest Secret. It was a great event – although traffic problems meant I was slightly late, despite setting off with 45 minutes leeway – and was sold out!

Ilkley is a lovely town in Yorkshire, surrounded by fantastic hills and a moor which is the subject of a very well known English song (“Ilkley Moor Bar T’At”) which recounts what happens if you go walking on the Moor, and even courting Mary-Jane on the Moor, without your hat on (spoiler: it finishes badly. In worms, then ducks, then the singers of the song…)

This version of the song has the guitar chords, and a transcription, though give it’s still in Tyke, you may have a hard time understanding it:

Anyway, it is a little known fact that when The Origin of Species was published, Darwin was not at Down House in Kent, where he lived, but in Ilkley. I learned this because my talk was chaired by Professor Greg Radick of the University of Leeds. Greg is Professor of History and Philosophy of Science, and in  2009 he wrote a slim book called Darwin in Ilkley, which he co-wrote with a retired Professor of Gastrointestinal Pathology and local historian, Mike Dixon. (It’s available in the US and in the UK on Kindle – you can also read it with the Kindle app on the tablet of your choice).

Darwin was in Ilkley because of the local water-based health cure, and he was in search of relief from his mysterious debilitating illness, which dogged Darwin throughout his life. Radick and Dixon noticed that when Darwin was in Ilkley, eating a reduced dairy diet in the hotel where he was taking the ‘hydropathic cure’, his symptoms abated. When he returned to Down House, his malaise returned.

There’s a lot more to their story than a simple correlation, and if true, it would not only settle an issue that has concerned Darwin’s biographers down the decades – was his disease ‘real’ or psychosomatic, and if it had a recognisable cause, what was it? – it would also add an intriguing coda to the interaction between the man and his science.

Up until a few thousand years ago, humans did not drink milk after weaning and they did not have the necessary enzymes to be able to digest the key part of milk, lactose – they were lactose intolerant. Consuming milk products as adults would have made them ill.

However, in several communities around the world, which had begun to domesticate mammals, mutations arose which enabled some individuals to digest milk throughout their life. Presumably those mutations had occurred repeatedly in evolutionary past, but there was no animal milk to drink (try milking a mammoth!), so no advantage was gained and those mutated genes were not passed down.

Today, there are important parts of the world where lactose intolerance is prevalent – Japan and China, for example, although it is rare (but not at all absent) in Europe and parts of Africa. This map from New Scientist shows the distribution of intolerance:

If you want to know more about lactose intolerance, this New Scientist article is pretty good.

Maybe if Darwin had known, he could have made himself feel a lot happier…

 

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Molly Worthen defends the traditional college lecture

October 19, 2015 • 11:00 am

We all hear that traditional college lectures are on the way out. I don’t know the facts, but I’m told that they’re not nearly as “educational” as “active learning” experiences, in which students use computers or teach each other, or as Massive Open Online Courses (MOOCs), in which a professor lectures online and the students take e-tests.  There are presumably data that back up the inferiority of traditional lectures, although I don’t whether the newer learning experiences have been compared to, say, small humanities seminars.

I don’t have strong feelings about this, for if one method teaches students better than another, we should by all means use the best one. And of course MOOCs, like the one on genetics and evolution taught at Duke by my ex-student Mohamed Noor, have brought high-quality education to students who either aren’t near a college or don’t have the substantial dosh it takes to get a regular college education.

But in some ways I mourn the passing of the lecture. Yes, they may bore students, or not teach them what we want, but I suppose I’m being selfish in saying that I’ve always found a good lecture fascinating and entertaining, and, from behind the lectern, it’s simply great fun to try to bring your subject alive.

In Sunday’s New York Times, writer and professor Molly Worthen defended the traditional lecture in a piece called “Lecture me. Really.” It’s a spirited defense of tradition, but in the end the data will tell—and Worthen gives precious little data. What she does give, upfront, is a pretty transparent motivation for her defense:

But there is an ominous note in the most recent chorus of calls to replace the “sage on the stage” with student-led discussion. These criticisms intersect with a broader crisis of confidence in the humanities. They are an attempt to further assimilate history, philosophy, literature and their sister disciplines to the goals and methods of the hard sciences — fields whose stars are rising in the eyes of administrators, politicians and higher-education entrepreneurs.

Now one could take this to mean that scientific demonstrations (i.e., surveys and data) showing that active learning trumps lectures are to be feared—in other words, a cry of “scientism.” But, so it seems, Worthen just feels that the humanities are different in how they get students to learn, and that learning humanities (Worthen teaches history) is best done by traditional lectures. Those lectures, she says, foster a set of skills unattainable by newer methods. What works for science education shouldn’t automatically be transferred to the humanities:

Listening continuously and taking notes for an hour is an unusual cognitive experience for most young people. Professors should embrace — and even advertise — lecture courses as an exercise in mindfulness and attention building, a mental workout that counteracts the junk food of nonstop social media. More and more of my colleagues are banning the use of laptops in their classrooms. They say that despite initial grumbling, students usually praise the policy by the end of the semester. “I think the students value a break from their multitasking lives,” Andrew Delbanco, a professor of American Studies at Columbia University and an award-winning teacher, told me. “The classroom is an unusual space for them to be in: Here’s a person talking about complicated ideas and challenging books and trying not to dumb them down, not playing for laughs, requiring 60 minutes of focused attention.”

I too banned laptops from my required evolution course, for I once watched from the back of the room when my co-teacher lectured, and observed that most students weren’t taking notes on their laptops, but reading email and playing on Facebook. Worthen continues:

. . . [Harvard President] Eliot was a chemist, so perhaps we should take his criticisms [of lectures] with a grain of salt. In the humanities, a good lecture class does just what Newman said: It keeps students’ minds in energetic and simultaneous action. And it teaches a rare skill in our smartphone-app-addled culture: the art of attention, the crucial first step in the “critical thinking” that educational theorists prize.

Fine. Where are the data? Or does Worthen, while abjuring the methods of science teaching, also abjure the need for empirical support of her views?

Worthen goes on to elaborate on the skills that a good lecture imparts—so long as students know how to listen properly, which involves not frenetically taking notes, but listening hard and mentally arguing with the professor as she speaks. Worthen calls this “an exercise in mindfulness and attention building, a mental workout that counteracts the junk food of nonstop social media.” Worthen considers the art of note-taking especially important, for if you do it right, you learn to distill a complex argument to its bare essentials. Such a skill, she says, imparts the lesson that “listening is not the same thing as thinking about what you plan to say next — and that critical thinking depends on mastery of facts, not knee-jerk opinions.”

I have some sympathy for Worthen, for that is exactly how I trained myself to learn as an undergraduate. I limited myself to a half-page of lecture notes per session (except for complicated science courses), and would go over those notes each evening for several hours, trying to reconstruct the lecture from which they came. And I found that technique both fulfilling and instructive—and I did okay in college. Now that I’m on the other side of the lectern, I also follow Worthen’s methods, which she describes as follows:

Holding their attention is not easy. I lecture from detailed notes, which I rehearse before each class until I know the script well enough to riff when inspiration strikes. I pace around, wave my arms, and call out questions to which I expect an answer. When the hour is done, I’m hot and sweaty. A good lecturer is “someone who conveys that there’s something at stake in what you’re talking about,” Dr. Delbanco said. Or as Ms. Severson told me, “I’m a pretty shy person, but when I lecture, there’s a certain charisma. This stuff matters to me — it saved my life.”

This is precisely what I do, and when I lecture I’m pretty much exhausted for the next few hours, covered with sweat and chalk dust and requiring caffeine (I rarely show Powerpoints in science class). But if the lecture went well, I feel great.

But that is a bit self-indulgent. In the end, what really matters is this: which method of instruction is the best way to impart both the knowledge and the learning and thinking skills we want students to acquire? To answer that question, of course, requires data, which in turn requires us to find ways to measure the intangible results we’re hired to promote. Worthen gives no such data, but merely an assertion that the traditional lecture is the best way to teach humanities students how to dissect arguments and think for themselves.

That may well be, but an assertion is just that—an unsupported claim. There may be data backing Worthen’s argument, but I suspect not, or she would have adduced them. From a more self-aggrandizing viewpoint, it might feel a bit dispiriting to be removed from the role of authority figure and entertainer that constitutes the lecturing professor. After all, there are few things as gratifying in academia as having given a good lecture that excites the students and prompts a lot of questions.

Because I was brought up on traditional lectures, from both sides of the podium, I sympathize with Worthen’s views. And she may be right. I’d just like to see the data.

As always, readers are invited to weigh in on this argument.

Fun at the Atheist Alliance of America meeting

October 19, 2015 • 9:00 am

I was in the suburbs a fair amount of time during the AAA convention, being a “handler” for Jeff Tayler and Inna Shevchenko, so I didn’t take a ton of pictures of the meeting itself. Fortunately, Mark Gura did, and posted a lot of them on his Facebook page’s AAA album). I’ll put his photos first, and mine toward the bottom.

Our master of ceremonies for the two days was none other than our Lord and Saviour Jesus Christ, played by Harry Shaughnessy. He had some kind of mechanized skateboard and glided around like a divine being.

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These were all speakers at the meeting. First, Dale McGowan:

Dale McGowan

Dave Silverman, president of the American Atheists:

Dave Silverman

Herb Silverman, who debated Dave Silverman in a “Silverman vs. Silverman Smackdown”, the topic being “Can you call yourself a Jewish atheist?” Herb said yes, Dave no. Although people seemed to think that Dave got the upper hand, I’m not going to stop calling myself a secular atheistic Jew.

Herb Silverman

Left to right: JT EberhardRichard Hayes,Hugh Mann and Tim Branin. 

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Mandisa Lateefah Thomas:

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Stephanie Guttormson:
Stephanie Guttormson

Richard Hayes (my photo):

Richard Haynes

Outgoing AAA President Jana Weaver and her husband Richard Halasz (they were married by Dan Barker at an FFRF convention).

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And my photos.  The hotel is very near the Atlanta airport, and since I got up early I could see the planes stacked up to land before dawn. Here they make their final approach as the sun comes up:

Planes

Below are the strident atheist Jeff Tayler of The Atlantic (and author of Sunday Secular Sermons on Salon), and his colleague and friend Inna Shevchenko, head of the activist organization FEMEN (Jeff wrote about Inna and FEMEN in his book Topless Jihadis: Inside FEMEN: The World’s Most Provocative Atheist Group. They’ve both had fascinating lives and both gave great talks. Inna got a standing ovation at two of the three talks she gave in the area.

J&I

Jeff and Inna doing a joint Q&A after their separate talks at the Southern Crescent Freethinkers meeting. I can’t find a YouTube video of Jeff talking about religion, but there’s a recent one of Inna giving a TED talk, “I will not stop speaking out loud.”

J&I peachtree humanists

This was only Inna’s second visit to the U.S. (she’s originally from Ukraine, and is now a political refugee in Paris), and Jeff’s first visit to the American Deep South (he’s lived most of his life overseas, the last 23 years in Moscow). I had great pleasure in introducing them an echt Southern barbecue meal at The Barbecue Kitchen, which I highlighted the other day. We all had chopped BBQ pork, with three vegetable “sides”. Inna also essayed sweet tea, the “table wine of the south.” And they both cleaned their plates. (The place is good!)

J&I southern kitche

The night before that, we exposed our visitors to another Southern food experience at Mary Mac’s Tearoom, a famous place to eat down-home Southern food in a fancier atmosphere. It’s an Atlanta institution. Here we all are about to chow down (the waiter took the photo). I had chicken and dumplings with tomato pie (a fantastic side) and squash souffle. And sweet tea, of course. At the right is Melissa Dawn, the brand-new president of the Atheist Alliance of America.

Jeff,Inna, Jerry, Mel

The bread basket at Mary Mac’s includes corn muffins, cinnamon rolls, and yeasty dinner rolls. Uncharacteristically, I forgot to take pictures of our main courses!

Bread Mary Mac

Readers’ wildlife photographs

October 19, 2015 • 7:30 am

We have a new contributor (I love new contributors!): Benjamin Taylor, who sent in a huge pile of photos (I’ll dole them out over time) with the note:

Last month I went on a camping trip around southern Africa (Namibia, Botswana, Zimbabwe, and Zambia) and took quite a few photographs.

Sociable weaver (Philetairus socius) nest:

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JAC: Here’s a photo of a sociable weaver (what a great bird name!) from Wikipedia:

Sociable_weaver_(Philetairus_socius)

Desert plant inflorescence (species unknown)


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View from the Elim Dune (Namib-Naukluft National Park, Namibia):

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Monday: Hili dialogue

October 19, 2015 • 4:57 am

Today Professor Ceiling Cat (Emeritus) heads back to Chicago, and I’ll be landing at Midway at about 1 p.m. I’ve had a great time on this monthlong trip, but it will be good to be home. Posting will be light for a few days until I catch up, but bear with me. Meanwhile in Dobrzyn, the Furry Navel of the World is down by the Vistula, contemplating climate change. I suspect, though, that she’s worried about its effect on the supply of rodents.  On the other hand, maybe she’s just distressed by the onset of cold weather.

Hili: Somebody must be to blame.
A: Blame for what?
Hili: For all these climate changes.

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In Polish:
Hili: Ktoś musi być winien.
Ja: Winien czego?
Hili: Tym wszystkim zmianom klimatycznym.