Archived videos from 2018

Here are old videos from the website front page from 2018 – I’m trying to archive them somewhere (2024). This page looks like hell, but it’s not meant to be seen by anyone – it’s just a temporary holding page so I can make the front page look better without permanently deleting these links

Twins, virtual twins and other curious couples

 

 

On the Origin of the Evolution Revolution: Conversations with the Pioneers of Evolutionary Biology, Anthropology, and Psychology

Report on HBES 2024

HBES 2024 was a success!

From May 22-25, we gathered in Aarhus, Denmark for 3.5 days of great presentations and camaraderie. It was the second in-person HBES meeting post-COVID, and it was lovely to see everyone again. Thanks to the local hosts Mathias Clasen, Elena Miu, & Marc Malmdorf Andersen, all the volunteers for helping it to run smoothly, the Program Committee, all competition judges, and of course all the speakers and presenters.

Plenaries

We enjoyed plenaries from the following researchers:

  • Joseph Carroll told us about how to use evolutionary theory in literary interpretations, which led to much interesting discussion
  • Lisa Feldman Barrett gave us three lessons on emotions: 1) your brain’s job is to predict your body’s future needs; 2) your brain constructs experience as it controls your body – experience is driven by predictions within your head; 3) signals (e.g., emotions observed in others) only have meaning in the context of other signals – the emotions you detect partly come from your own head
  • Dorsa Amir showed why evolutionists need to study children: many populations are mostly kids, and we spend a lot of time as kids. Also, kids learn mostly from other kids, so peer culture differs in interesting ways from vertically-transmitted culture
  • Judith Burkart argues why humans are special: we have an ape legacy of large brains which combines with our cooperative breeding to make us even smarter and extra cooperative. We share many things, including food… and information! Teaching is more common in cooperative breeders and skill-intensive niches, both of which apply to humans. Interesting fact: infanticide of healthy infants only occurs in cooperative breeders… like humans.
  • Manvir Singh presented a new view of cultural evolution: some traditions – call them “attractors” – appeal more to humans, and “super-attractors” are complex cultural packages that themselves attract attractors. He illustrated this with interesting data on the cross-cultural consistency of shamanism, music types, and more
  • Jaimie Krems argued that friendship exists within a network of rivalries over friends, so we need to study friendship “beyond the dyad”. Does someone value you more than your rivals? She presented neat data that competition over friends leads to friendship jealousy, venting to derogate competitors, and more
  • Nicolas Baumard presented a very useful way of seeing cultural evolution. Rather than view it as the transmission of cultural units, his “cultural ecology” sees culture as an expression of humans’ extended phenotype. This view incorporates ecological concepts like legacy effects (i.e., individuals leave traces that affect subsequent generations) and succession (cumulative change). Rather than “what cultural units will colonize new minds”, this flips the question to “which cultural legacies do people adopt?”
  • Brian Nosek (our keynote speaker) proposed a new model of Open Science to fix the problems in publishing that are a legacy of pre-digital (and pre-internet) print publishing, including evaluation of works at all stages and evaluation-based reward structures

Conference Awards

Every HBES conference has three Conference Awards: the New Investigator Award to the best graduate student paper/presentation, the Postdoctoral Award to the best paper/presentation by a recent graduate (<5 years post-PhD), and the Poster Award (best poster by anyone). Here are the winners of the 2024 HBES Conference Awards:

  • New Investigator Award: Olympia Campbell for “Genetic markers of cousin marriages and honour cultures”
  • Postdoctoctdoral Award: Konrad Rudnicki for “Investigating the evolutionary roots of gossip: the effects of gossip on cortisol, beta-endorphins, and cytokine levels”
  • Poster Award: Kasia Pisanski and colleagues for “The role of loudness in vocal intimidation”

Society Awards

HBES also announces the Society Awards: the Early Career Award for Distinguished Scientific Contribution (best researcher <10 years post-PhD), the HBES Fellows (multiple awardees >10 years post-PhD), the Rising Stars (multiple awardees <8 years post-PhD), and the Lifetime Achievement Award for Distinguished Scientific Contribution. Here are the winners of the 2024 HBES Society Awards:

Paper Awards

And finally, there are the Paper Awards: the Margo Wilson Award for the best paper published the previous year in Evolution and Human Behavior (the official HBES journal), and the Don Symons Adaptationism Award for the best paper in the previous three years in any journal that best exemplifies the adaptationist program (this award is privately sponsored). The 2024 winners of the HBES Paper Awards are:

Announcing HBES 2025

Next year’s HBES will be held from June 4th-7th 2025 at Stockton University at their campus in Atlantic City New Jersey, with local host Josh Duntley. Atlantic City is accessible from Philadelphia and Newark NJ, and should have both dorm accommodation and hotels. Details will be announced soon. See you there!

“Thanks for the heads up!”: Why provide information (for free)?

by Mia Karabegovic & Hugo Mercier

“Free” information is so ubiquitous that we rarely question the motivations for producing and sharing it in the first place. We can hop on Wikipedia to learn about any topic, however niche, check diners’ experiences on Yelp to figure out where to eat, or consult book reviews on GoodReads to pick up the best new thriller. We receive advice from friends, colleagues, acquaintances, about anything from a prospective purchase to tips and tricks which make our jobs easier. Most of this wealth of information at our disposal is contributed by others who ostensibly gain nothing for providing it.

But all of these people – from friends providing advice to Yelp reviewers – pay some cost, at least in the time it takes for them to provide us the information (how often do you leave informative reviews of the places you’ve eaten at?). Why are we so willing to pay these costs?  Our hypothesis is there is something in it for them, and that something is gratitude.

Research on gratitude has shown that being on the receiving end of prosocial behavior elicits feelings of gratitude, which reflect on the perceived cooperative partner value of the one extending the favor, and lead the receiver to be more prosocial in turn – especially when it comes to reciprocating the favor. We used a model proposed by McCullough and colleagues to check whether gratitude for information behaves as gratitude for other prosocial behavior: that it increases with the amount of benefits the receiver gets from the advice, with the cost of the sender for providing it, with the intention to transmit the information to the particular receiver, and with whether it is provided gratuitously (i.e. without expecting immediate rewards).

Our first study presented online participants with different scenarios, such as imagining they needed advice about taxes or help in finding a rare postage stamp. We asked them to choose which advisor they would feel more grateful to out of pairs in which one either provided more benefits, paid a higher cost, intentionally provided the information, or did not ask for immediate reciprocation – and found that gratitude followed the theoretically predicted pattern.

When there was no difference between informants on the four dimensions, participants showed more gratitude to those who provided the information first. This “redundancy effect” might help to explain why journalists often scramble to break a story first and get the “scoop”: apart from selling more papers or getting more clicks on the news in question, they might also gain more future favor via gratitude. Competing to be “first” could play a role in disseminating unchecked or incomplete information, especially in competitive situations like the news sector or scientific publishing.

While our first study showed that the model of gratitude is generally applicable to the case of information, there are certain features which set information apart from the kind of prosocial behaviors that have been shown to elicit gratitude.

One peculiarity of information is that it can generally be shared with either a few or many people at once without losing its value to the recipients. For example, knowing about epistemic gratitude will likely benefit you equally whether two or two hundred people read this blog post. However, gratitude could still differ depending on the size of the audience because of perceived intentionality, which is what we found in a study pitting information shared with an individual versus a group: our participants reported feeling grateful towards those who provided the information to them in private more often than those who shared it with a larger group. This kind of strategy is sometimes employed in personalized marketing, which might incite more gratitude than usual ads with broader targets, because people might feel more grateful for messages that appear as if they have been sent to them specifically.

Secondly, unlike a gifted apple that can be eaten only once, knowledge can be reused and passed on to others. Do we favor the providers of such “gifts” over those who provide the same benefits, but only to us? In a follow-up experiment, we showed that people tend to be more grateful to those whose advice they can further employ to boost their own reputation by spreading, as opposed to advice which only carries benefits to themselves. Combined with the result of the last experiment, this might explain why rumors are often propagated from one person or very small group to the next, as it would maximize the gratitude of those whom the rumor is shared with.

Some other, broader implications of our results deserve a mention. One of the most salient benefits of information is to change our minds. We should thus feel more grateful for (accurate) information that challenges our views. But this might not be true for all kinds of beliefs, however. For political opinions, where accuracy plays a smaller role, people might feel more grateful to those who provide them with information that can justify their views, rather than challenge them.

People who share information do not always seek gratitude – sometimes, they want to appear competent. There are interesting tradeoffs in the way we might present the costs of information acquisition in this regard. Our study shows that, to maximize gratitude, we should stress the cost (or effort), while the same might not be true for competence. Taken to the extreme, this might help explain why some religious figures are presented as having paid a very high cost to deliver their message (Jesus Christ and the gospel being the paradigmatic example), while by contrast scientists might be more keen on describing their discoveries as flashes of insight. A possible strategy to maximize both gratitude and competence (for which Jesus Christ is, again, a good example) could be to emphasize the costs of transmission: in this case, we can appear competent (we easily thought of something clever) and simultaneously show we care about their audience (we incurred a substantial cost to relay the information). Competence should also not be affected by the size of the audience in the same way gratitude is – as a result, people who address broader audiences might be more tempted to try to appear competent (which can be done at scale), than to elicit gratitude in their audience.

We hope that this study will stimulate more research into what motivates people to provide information ‘for free,’ and how that shapes our informational environments.

Read the original article: Karabegovic, M., Wang, L., Boyer, P., & Mercier, H. (2024). Epistemic gratitude and the provision of information. Evolution & Human Behavior, 45(3), 252-260.

Is it time to jettison the alpha male stereotype of leadership?

– by Adi Wiezel & Doug Kenrick

Women make up slightly over 50 percent of the U.S. population. Why then are only a quarter of U.S. Senators and a tenth of Fortune 500 CEOs women? Why have none of 45 American Presidents been a woman? According to some experts on leadership, the explanation involves two steps: first, people’s stereotype of a leader involves masculinity and dominance (the human incarnation of an “Alpha Male” chimpanzee); second, this stereotype translates into a preference. When voters go the polls, or when boards of directors choose executives, the Alpha Male stereotype drives their choices.

But a recently published series of studies suggests that this story is only half true: Most people’s mental image of a leader is a man. But does that mean most people prefer men as leaders? No, in fact, there is a slight preference for women as leaders. This is true whether people are evaluating candidates for a position in a business organization, or for a political office.

More importantly than the slight preference for women, there is a strong bias against leaders who manifest the Alpha Male brand of dominance.

To understand the antipathy towards dominance, it’s important to recognize a distinction between dominance and prestige. In many animal species, positions of status are acquired by aggression and threats, as in the case of Alpha Male chimpanzees. No doubt some of human status is achieved by bullying and threats, with power-hungry individuals fighting to win control over others. But human beings also have another route to status – via prestige. Because human groups involve a great deal of cooperation and mutual problem-solving, people often freely confer status, and leadership positions, on individuals who are especially socially skilled and who can mediate and reduce conflict within and between groups. Unlike dominance, prestige is bestowed by other group members, rather than taken by force. And unlike dominance, prestige is not particularly sex-typed.

In five studies, our research team explored the relationship between leader stereotypes and preferences. In the first study, we found that most people asked to imagine a leader spontaneously thought of a man. This was true whether they were asked to think of a dominant leader (“… has a lot of power and has authority and control over people. People don’t get in this person’s way”) or a prestigious leader (“… has a lot of prestige and has people’s respect and admiration. People seek this person out.”). A follow-up study found this true whether people were prompted to think of a leader in the military, politics, business, sports, science, or the arts.

After imagining a leader, however, people were asked “How much would you like to work for this person?” Did preferences follow stereotypes? No. In fact, there was a slight preference favoring female leaders. More importantly, there was a strong preference to be led by a prestigious rather than a dominant leader. This preference for female over male leaders was corroborated in an analysis of a nationally representative sample from the Pew American Trends Panel.

In another experimental study, people evaluated two candidates for a leadership position in an organization. One leader was described as dominant (forceful, commanding), the other as prestigious (well-respected, looked up to). Sometimes the dominant candidate was a woman and the prestigious candidate was a man, and sometimes the woman was the prestigious candidate. In both cases, people strongly preferred the prestigious over the dominant leader—regardless of whether that person was a woman or a man.

In another study, participants judged actual politicians from facial photographs (European parliamentarians, not known to American participants). People viewed women as more likely to use prestige- over dominance-based leadership strategies, and when asked whether they would vote for this person as governor of their state, showed a slight preference for the women over the men.

But do voters still choose men over women in real elections? No. Analyses of actual U.S. elections confirm that women are (very slightly) favored when they do run for elected office, even at the highest levels. There has only been one instance in which a woman ran against a man for the U.S. presidency, and she earned the majority of the popular vote.

But if people have no prejudice against women leaders, why doesn’t American leadership reflect the fact that half the population is female? The answer is that fewer women tend to run for high office and may be less likely to be chosen by party leaders. Hence, social scientists who persist in promoting the belief that there is a prejudice against females in leadership positions may be unintentionally contributing to the problem. The data suggest it is time to update our models.

This set of studies also raised further questions. Some of these were addressed by seven thoughtful commentaries from prominent scholars in the field, including Alice Eagly and Steven J. Karau, Joey Cheng, Mark van Vugt, Charleen Case and Laurel Detert, Nina Rodriguez and Jaimie Krems, Chris von Rueden, and Patrick Durkee and Aaron Lukaszewski. For example, Case and Detert asked why women were stereotyped as more prestigious than men—is it that men and women vary in their capacity to wield dominance, or that men and women are differentially rewarded for using these two strategies (such that women are more often punished for using dominance)? Moreover, since dominance was less preferred as measured in the present studies, it is worth considering whether this would still be the case for more expanded definitions of dominance. For instance, as Durkee and Lukaszewski suggest, it may be that people dislike dominance when it is used to inflict net costs on the group, but not when it used to provide net benefits to the group. Collectively, commentaries like these suggest the importance of considering further nuance in our models of human leadership. One promising future direction involves considering what ancestral functions leaders may have served, what traits and capacities may have been useful for those roles, and what mismatches we see today.

Read the original article: Wiezel, A., Barlev, M., Martos, C.R., & Kenrick, D.T. (2024). Stereotypes vs. preferences: revisiting the role of alpha males in leadership. Evolution & Human Behavior45(3), 292-308.

Read the commentary articles and authors’ response:

  • Patrick Durkee & Aaron Lukaszewski: Deconstructing “dominance” to refine leadership search (see here)
  • Alice Eagly & Steven Karau: Implications of dominance versus agency in the interpretation of preferences for female and male leaders (see here)
  • Charleen Case & Laurel Detert: Are men (believe to be) less prestige-oriented than women? (see here)
  • Christopher Von Rueden: “Think leader, think alpha male” and the evolution of leader stereotypes (see here)
  • Joey Cheng: Prestige-based leadership offers women leaders an advantage and reduces gender inequality in leadership (see here)
  • Nina Rodriguez & Jaimie Krems: Two notes on Wiezel et al.: explaining why people disfavor dominant leaders and exploring overlooked sources of women’s dominance and leadership (see here)
  • Authors’ response (Adi Wiezel, Michael Barlev & Doug Kenrick): Beyond stereotypes versus preferences: sex, dominance, and the functions of leadership (see here)

Image source (Creative Commons)