The conversation, in brief.
Hosts Dave Pietraszewski and David Pinsof are joined by anthropologist Manvir Singh to explore the evolutionary origins of shamanism, magical practices, and human social cooperation. The discussion covers error management psychology, sympathetic magic, and how ritual behaviors function as instrumental strategies and social signals. Singh and the hosts also challenge traditional evolutionary assumptions that human ancestors lived exclusively in small, mobile, and egalitarian bands, arguing instead that Pleistocene environmental volatility and diverse resource density fostered complex social hierarchies, large-scale cooperation, and context-sensitive cognitive adaptations.
Through the conversation.
16 sections010:00 – 9:11Introduction and Megafauna of the Environment of Evolutionary Adaptedness
Hosts Dave Pietraszewski and David Pinsof introduce the podcast episode and their guest, anthropologist Manvir Singh. They discuss the podcast's formatting, meta-discussions on names, and transition into a conversation about ancestral environments, Pleistocene megafauna, and the psychological resilience fostered by ancestral coexistence with formidable Ice Age animals.
your ancestors dealt with these 12-foot bears. Like you are more resilient.
“your ancestors dealt with these 12-foot bears. Like you are more resilient.” 6:20
029:12 – 12:00The Evolutionary Puzzle of Shamanism and Magical Practices
The hosts and guest Manvir Singh explore the evolution of shamanism and magical thinking across human cultures. David Pinsof expresses puzzlement over why people are not more skeptical of ritualistic practices like trances and healing performances, prompting a discussion on epistemic vigilance and why humans rely on seemingly unproven specialists.
one of the basic questions that I confronted in starting to think about shamanism was the one of why should people um pay other experts or specialists to engage in these practices?
“one of the basic questions that I confronted in starting to think about shamanism was the one of why should people um pay other experts or specialists to engage in these practices?” 11:17
Dave Pietraszewski, David Pinsof, and guest Manvir Singh discuss error management psychology and bet-hedging as theoretical lenses for understanding superstition, magic, and ritual. They explore how asymmetries of costs in evaluating causal relationships can drive adaptive thresholds for superstitious behaviors, such as wearing lucky items or amulets, across different high-stakes contexts.
magic fundamentally is the product of a similar psychology
“magic fundamentally is the product of a similar psychology” 14:58
David Pinsof pushes back on the error management framework by questioning why people rely on causal relationships that violate folk ontologies and whether they hold sincere beliefs in them. Manvir Singh responds by discussing empirical evidence on perceived efficacy and introduces the concepts of sympathetic magic, similarity, and contagion.
sympathetic magic is the basic principle that we find in a lot of magical practices as they occur across societies that like affects like
“sympathetic magic is the basic principle that we find in a lot of magical practices as they occur across societies that like affects like.” 22:46
0524:01 – 28:16Causal Intuitions, Epistemic Promiscuity, and Shamanic Practice
Dave Pietraszewski, David Pinsof, and guest Manvir Singh discuss whether human causal intuitions predispose people toward sympathetic magic or if humans are epistemically promiscuous when mapping out the world. They also explore how shamans engage with folk ontologies by invoking unseen agents to produce desired outcomes.
Singh discusses the hypothesis that forms of magic aligning with folk ontologies of causality are favored by human causal intuitions.
“forms of magic that actually do accord with some kind of folk ontology of of causality are favored.” 24:52
0628:16 – 36:02Interpreting Sympathetic Magic Through Social Signals and Ethnography
The speakers debate whether sympathetic magic operates as a social and communicative signal directed at supernatural agents or as a direct causal mechanism. Drawing on ethnographic work in the Mentawai Islands, Singh notes that practitioners often experience these rituals as actual causal relationships rather than active communications with spirits.
Singh describes how building a house in the Mentawai Islands involves plant rituals based on sympathetic causality rather than invoked supernatural agents.
“there's a lot of sympathetic causality invoked that when the evil comes or bad things come, these deter it” 34:14
Host Dave Pietraszewski and guest Manvir Singh discuss different accounts of magic and ritual, contrasting theories about intrinsic physiological benefits like stress reduction with Manvir Singh's error management and instrumental cost-benefit approach.
Singh suggests that error management approaches that focus on instrumental ends and differential costs and benefits are predictively powerful for explaining magic.
“I find really, really compelling it's the the capacity of an error management approach” 38:04
Singh notes that while intrinsic benefits like stress reduction occur, they may be epiphenomenal rather than the driving reason for magic's existence.
“I think of these intrinsic benefits, this this whole class of intrinsic benefits as potentially epiphenomenal” 38:58
0839:49 – 48:07Shamanism Production and Low Efficacy Social Signaling
The hosts and Manvir Singh explore the production side of shamanism, examining how specialist markets emerge and how low-efficacy rituals can function as high-cost signals of care, parental investment, and group loyalty.
Singh argues that shamanism requires a social species capable of service trading, with specialists competing to provide services relative to consumer demand.
“you need to think about there being an entire class of producers who are competing amongst themselves” 41:01
0948:07 – 53:59Signaling, Reputational Costs, and Social Inferences
The speakers discuss whether low-efficacy ritual behaviors persist due to social reputational pressures and the tragedy of the commons. Dave Pietraszewski, David Pinsof, and Manvir Singh examine how individuals make inferences about others who deviate from group norms, debating whether these inferences rely on generalized signaling or contextual judgments and how cues can transform into intentional signals.
Deviation from group rituals can impose social costs on individuals.
“you could pay a cost to to either your moral reputation or your intellectual uh reputation by not participating in in a group ritual” 51:04
Cues within a group can evolve into signals once people gain common knowledge.
“cues have a way of becoming signals in our in our species” 53:48
Manvir Singh discusses his work with Luke Lowacki challenging the traditional evolutionary psychology assumption that humans evolved exclusively in small, mobile, egalitarian bands. He explains that environments with dense, rich resources often fostered larger, sedentary, hierarchical societies, suggesting we should rethink the diversity of human social structures throughout history.
A passage from this discussion.
“grew up, there was very much an argument that we evolved for a small-scale social world of” 54:36
David Pietraszewski, David Pinsof, and guest Manvir Singh discuss the theoretical implications of the ancestral environment for evolutionary psychology. They examine how moving away from the assumption that ancestral human societies were exclusively small-scale and egalitarian opens up new hypotheses regarding selection pressures for large-scale cooperation and social hierarchy.
The speakers discuss how challenging the premise that the ancestral environment was small scale and egalitarian allows researchers to entertain hypotheses about selection for large-scale cooperation and social hierarchy.
“challenging a lot of different hypotheses that exist in the field that are that are based on this premise that the ancestral environment was necessarily small scale and egalitarian.” 1:01:39
The speakers reframe human evolutionary history away from the transition from tiny bands to large societies, arguing instead that humans evolved under conditions of intense climatic and environmental volatility. They connect this variability to the evolution of large brains capable of context-sensitive strategies and generalist-specialist niches.
The speakers suggest that environmental volatility favors a context-sensitive psychology and larger brains that can adapt to diverse ecological conditions.
“the selection pressures favor a context-sensitive psychology that can adapt to whatever the circumstances are and learn the relevant contingencies” 1:10:21
Hosts Dave Pietraszewski and David Pinsof discuss with guest Manvir Singh how Pleistocene climatic volatility and generalist adaptations shaped human extractive foraging, cognitive evolution, and the deep links between ecology and social organization.
Humans evolved in volatile environments during the Pleistocene, fostering versatility and environmental intervention.
“product of us having evolved in such volatile of during the Pleistocene” 1:12:28
Extractive foraging serves as a mechanism for contending with environmental variability.
“extracting foraging as a mechanism toward contending with variability” 1:13:32
Guest Manvir Singh shares his current book project on early Indo-European mythology, detailing linguistic and mythological reconstructions, while hosts Dave and David conclude the episode by highlighting the vitality of evolutionary behavioral sciences.
Singh's book project on early Indo-European mythology reconstructs ancient ancestral tales and figures using comparative scholarly evidence.
“my book is trying to retell these mythologies” 1:19:24
Hosts Dave Pietraszewski and David Pinsof discuss podcast logistics, including summer scheduling challenges, traveling, and the importance of listener support through Patreon to help cover personal expenses.
The hosts jokingly suggest that listener support on Patreon helps fund their reproductive success.
“throw in some money on the Patreon too” 1:24:38
Dave Pietraszewski and David Pinsof chat about hot weather, ponder potential podcast guests from Australia and New Zealand, and wrap up the episode by wishing listeners a pleasant summer.
The hosts discuss the possibility of inviting researchers from Australia and New Zealand despite time zone challenges.
“there's some Australian folks and New Zealand folks we should have on” 1:26:55