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Home » Transcript of Dr. Robert Sapolsky on Biological Underpinnings of Religiosity

Transcript of Dr. Robert Sapolsky on Biological Underpinnings of Religiosity

Read the full transcript of neuroscientist Dr. Robert Sapolsky’s lecture titled “Biological Underpinnings of Religiosity”, (Dec 30, 2011).

Lecture starts here:

DR. ROBERT SAPOLSKY: This will be a lecture looking at a whole lot of the themes we’ve been considering all quarter in here, how they apply to a topic that is very close to home. And what I already know from some of the emails today was Friday’s lecture looking at depression was already getting close to home. Some of the themes that came out at the end of the chaos lecture, some of the notions there that perhaps there are no blueprints, perhaps there need not be blueprints, perhaps there may still be blueprints despite a theoretical demonstration that you don’t need them hitting close to home also. That is what all of today’s lecture is about, looking at some biological underpinnings of religiosity. And this one is far and away from the lecture I am most nervous for, simply because this one, people wind up having strong opinions about, and I want to navigate through this one as successfully as possible.

Okay. Just to give me a sense of where I’m starting off from here, how many of you would characterize yourself as religious? As fairly religious? As highly religious? Okay.

Good. How many of you would characterize yourself as very, very comfortably, acceptingly nonreligious? Lots of hands there as well. Okay. Lots of potential differences in responding to this.

Evolutionary Roots of Behavior

Where we pick up on is from where we left off with the lecture last Wednesday, which was the schizophrenia lecture. And where we finished with was this whole notion that by now we have to have dealt with every single one of these topics, starting on the far right, what’s the behavior look like and eventually getting to the far left, what are the evolutionary roots? And what has always been the rationale for that is the second we’re looking at anything with genes, genetic influences, genetic hints, genetic whatevers, we’re asking where these genes come from? Where is the evolutionary sense? Where is the adaptive value for anything we’re looking at?

How would a sociobiologist interpret it? Someone else, you have a question? I should be and I don’t think I understand the subject enough to know other than something about religiosity is done in a social context, and that’s going to become important here. And the difference is one that puzzles me a great deal because it clearly transcends issues of just the social community, but that seems to be a good defining point to start from. Okay.

So where we ended up there with was this puzzle. We finished at the end of depression looking at evolutionary aspects and looking at there may be some hidden benefits, that weird argument in one of the readings in your reader creativity and aspects of manic depression going hand in hand. But we were left with somewhat of a puzzle at the end of the schizophrenia lecture. Why might there have been selection for these genes? Because once again, we start off with a theme from the very beginning, genes being selected for, why did the giraffe have long necks because this is a trait that’s adaptive.

In our Darwinian terms, this is a trait that’s associated with leaving more copies of your genes in future generations. What is the adaptive value for genes for schizophrenia? Because we looked at the fact that in this contemporary form, schizophrenia is by definition a maladaptive trait. Schizophrenics leave fewer copies of their genes than their unaffected siblings. It is a trait which is formally maladaptive.

Hidden Advantages in Genetic Disorders

What might be a hidden advantage lurking there? And where we left at the very end of that was just a hint that, in fact, as far as anyone can tell, there are no hidden advantages to schizophrenia. There may not be any adaptive advantage. What I left you with there was the notion, however, that there might be another disease lurking around related to schizophrenia, which does have an adaptive advantage. And to begin here, what we have to go back to is one of the basic ninth grade biology concepts in science there, which is the whole notion that some of the time a genetic trait, which is god awful in one setting, may have some advantages elsewhere.

And we all learned the exact same example back in ninth grade, sickle cell anemia, sickle cell anemia, which in one context when fully expressed is a hematological disaster, absolutely bad news, horrible and in other settings can protect you against malaria and not by chance that versions of sickle cell anemia have evolved in sub Saharan Africa, Mediterranean areas, thalassemia related diseases that this has been a frequent solution. Also in passing showing us one of the truisms from this class, there’s no such thing as a bad gene, there’s only a bad gene environment interaction. Okay. So this theme in medical genetics comes through a lot of times, genetic traits, which in one setting are bad news, may have advantages in another setting. And it’s turning out, this is a theme in lots of different realms of genetics.

Other examples, Tay Sachs disease. Tay Sachs, horrible congenital disorder predominantly found in Ashkenazi Jews. What you wind up getting there is full blown version, complete cortical failure to develop, child is massively retarded at birth, dies shortly afterward, partial version of Tay Sachs disease and you’re resistant to tuberculosis. Nobody knows the mechanism for it yet. People absolutely understand why the sickle cell trait both sets you up for anemia and protection from malaria.

Nobody understands it yet with Tay Sachs, but this explains one of the phenomena back from the Middle Ages, the European belief that Jews were safe from tuberculosis because they were poisoning the Christian wells. And that was a cause of a large number of pogroms back when there is a genetic explanation, which is the trait for Tay Sachs disease in this partially expressed form protects from tuberculosis.

More examples of this, cystic fibrosis, the most common congenital disorder these days that is massively life threatening.