Live Entertainment FAQ

The Psychology of Live Entertainment.

What actually happens to a room full of people when they experience something together, and why it affects them the way it does.

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Overview

The Ritual of Live Experience

Humans have been gathering for live communal experience (ritual, performance, spectacle) for as long as the archaeological record exists. The ancient Greeks built theaters into hillsides capable of holding 14,000 people. The Romans staged spectacle at the Colosseum. The Asclepieion at Epidaurus combined healing ritual with theatrical performance in the explicit belief that the two processes were related. These were not leisure activities in the modern sense. They were recognized social technologies, structured uses of collective gathering to produce states in participants that solitary experience could not produce.

That recognition predated the science by two millennia. It is only in the 20th and 21st centuries that researchers have been able to explain, at a neurological level, what those builders and impresarios already understood in practice: that the human nervous system behaves differently in a room with other nervous systems experiencing something simultaneously. Not metaphorically differently. Measurably, physiologically, chemically differently.

The question this page answers is not whether live entertainment is valuable. That question is settled by the archaeological record and by two centuries of organizational practice. The question is: what exactly is happening, and why?

Section 1

The Neuroscience of Shared Experience

The concept that collective gathering produces a distinctive psychological state has a long intellectual history. The French sociologist Emile Durkheim, writing in 1912, named it "collective effervescence", the intense emotional energy generated when a group gathers to enact a shared purpose. Durkheim observed this in religious ritual, but the mechanism he identified was not theological. It was social and psychological: the group generates states in its members that its members cannot generate alone.

Contemporary research has provided the neurological account that Durkheim lacked. Nick Hopkins and colleagues, in a 2015 study of mass gathering behavior, identified two distinct pathways through which collective experience produces its characteristic effects. The first is Collective Self-Realization (CSR): participants feel they are behaviorally enacting the values of their shared identity, producing an experience described in the research as "intensely pleasurable and uplifting." The second is Relationality: the sense of intimacy and connection felt toward others who share the same experience. When individuals perceive others as sharing their social identity, they become more cooperative, more trusting, and more comfortable reducing social distance. The group becomes, in Hopkins' framing, a "psychological crowd", a collection of individuals operating with a shared frame of reference and a common interpretation of events.

The neurochemical substrate of this transformation has been mapped in some detail. Paul Zak's research on narrative immersion identified oxytocin, the neuropeptide associated with trust and prosocial behavior, as a primary driver of collective engagement. Effective shared experience triggers oxytocin synthesis in participants, which signals tribal identification, reduces physiological stress, and increases empathy and connection. In Zak's experimental design, participants who underwent this neurochemical shift showed measurable prosocial behavior at rates that corresponded directly to the degree of oxytocin elevation. A narrative without dramatic tension failed to trigger the response at all; the chemical release requires an experience that captures and holds genuine attention, not merely pleasant content.

The role of shared laughter in this process is especially well-documented. A 2017 study conducted at the University of Turku in Finland demonstrated that watching comedy in a group setting triggers the release of endogenous opioids (endorphins) in reward-related regions of the brain. The effect was specific to the group context; solo viewing did not produce the same magnitude of response. The researchers noted that laughter functions as what Robin Dunbar of Oxford University has called "vocal grooming", a mechanism that bonds multiple individuals simultaneously in a way that one-to-one conversation cannot replicate. A single wave of genuine shared laughter does neurochemically what would otherwise require extended personal interaction with each person in the room individually.

Mirror neurons provide an additional mechanism. When observers watch another person undergo a genuine, involuntary experience, a response they did not choose and cannot fake, the observer's motor and sensory cortex activates as though experiencing a partial version of the same event. Cognitive neuroscientists studying this phenomenon have described it as the melting of the self-other divide: the boundary between self and witnessed experience becomes genuinely permeable. This is not a figure of speech. It is a description of documented neural firing patterns, replicated across multiple imaging methodologies.

The practical implication is that a room of people watching something genuine does not function as a collection of isolated individuals having parallel private experiences. It functions as a coupled system, each person's response feeding and amplifying the responses of those around them, the group as a whole producing emotional and neurochemical states that no individual in that room could produce alone.

One qualifier the research establishes is worth noting: not all laughter produces these bonding effects equally. Romero and Pescosolido's 2008 research on humor in organizational settings distinguishes between affiliative humor (benign, inclusive, directed at shared absurdity) and negative humor, which includes sarcasm and teasing directed at individuals. Affiliative humor produces the positive emotional contagion and bonding effects described above. Negative humor produces the opposite: it creates subgroups, damages trust, and can fragment a room rather than unify it. The one exception the research identifies is humor directed at an external target rather than a person present, which can actually strengthen in-group cohesion by establishing a shared "other." The distinction matters because the neurochemical benefit of shared laughter is contingent on the social safety of the laughter, which is precisely why the ethics of humor in a live entertainment context are not incidental to the format but structural to its effectiveness.

Live Entertainment
Sources
  • Durkheim, E. (1912). The Elementary Forms of Religious Life.
  • Hopkins, N., et al. (2015). Haj Pilgrimage, Collective Effervescence, and Identity. British Journal of Social Psychology, 54(3).
  • Zak, P.J. (2015). Why Your Brain Loves Good Storytelling. Harvard Business Review.
  • Dunbar, R.I.M. (2012). Bridging Evolutionary Approaches to Social Behavior. Philosophical Transactions of the Royal Society B.
  • Manninen, S., et al. (2017). Social Laughter Triggers Endogenous Opioid Release in Humans. Journal of Neuroscience, 37(25).
  • Romero, E.J. & Pescosolido, A. (2008). Humor and the Search for Relevance. Journal of Business Research, 61(5).
Section 2

Attention, Memory, and the Architecture of a Live Event

Not all moments in a live event are created equal. The cognitive science of attention and memory has produced a precise account of why some events linger in participants' minds for years while others are forgotten before the drive home.

The foundational framework is Daniel Kahneman's distinction between the experiencing self and the remembering self. The experiencing self lives in the moment, registering pleasure or discomfort in real time. The remembering self is the narrator who, looking back, constructs the story of what happened. These two selves produce systematically different evaluations of the same experience, and it is the remembering self, not the experiencing self, that determines whether an event mattered, whether it gets recommended, and whether it is worth repeating.

Kahneman's Peak-End Rule, established through research published in 1993, states that the remembering self's evaluation of an experience is determined almost entirely by two moments: the most intense moment (the peak) and the final moments (the end). Everything in between (duration, average quality, the steady baseline of the middle) is largely discounted through what the research calls duration neglect. In a landmark experiment, participants were exposed to two versions of an unpleasant experience: one that ended at its most intense point, and one that continued beyond that peak but finished at a less intense level. Subjects systematically preferred the longer experience, not because it felt better overall, but because it ended on a less severe note. The remembering self is a biased editor who constructs a narrative from peaks and conclusions, not a faithful recorder of the full timeline.

For live entertainment, this has concrete structural implications. The overall length of an event is largely irrelevant to how participants will remember it. A 45-minute experience with a strong genuine peak and a high-energy conclusion will be remembered as better than a 90-minute experience whose intensity wanes across the second half and ends flat. This is not a matter of subjective preference. It is a well-replicated finding about how memory encodes live experience, and it holds regardless of the content type or audience demographic.

The 20-minute attention threshold adds a second structural constraint. Research by Dianne Dukette and David Cornish established that sustained adult attention has a physiological ceiling of approximately 20 minutes before requiring either rest or a significant stimulus change to reset. James Cutting of Cornell University documented a finer-grained version of the same phenomenon, what he called the natural rhythm of human attention, requiring pattern interruption at intervals of seconds to minutes throughout any engaging experience, not just at the longer attention-span ceiling. Neil Bradbury's 2016 analysis of lecture attention data confirmed the 10-to-20-minute window as the practical boundary for effective information absorption without structural intervention.

Beyond those thresholds, the audience has not simply become tired. The brain's active distractor-suppression mechanisms, documented through ERP (Event-Related Potential) neuroimaging as the PD component, a neural marker for filtering irrelevant stimuli, begin consuming cognitive resources that would otherwise be available for engagement and memory encoding. Longer presentation durations allow more effective distractor suppression, which is why pacing and transition design are not cosmetic choices but functional ones.

Emotional intensity is the primary mechanism by which the brain flags material for long-term storage. Research on memory encoding consistently shows that the amygdala tags emotionally charged moments as priority items for the hippocampus to consolidate into long-term memory. Shared experiences that generate genuine emotional response (surprise, laughter, recognition) are encoded with higher priority and retrieved more reliably than neutral content delivered at equivalent length. This is why a room can sit through a two-hour keynote and remember three minutes of it, while a single unexpected genuine moment from an entirely different kind of event is still being recalled a year later.

Live Entertainment
Sources
  • Kahneman, D. & Fredrickson, B.L. (1993). Duration Neglect in Retrospective Evaluations of Affective Episodes. Journal of Personality and Social Psychology, 65(1).
  • Kahneman, D. (2011). Thinking, Fast and Slow. Farrar, Straus and Giroux.
  • Dukette, D. & Cornish, D. (2009). The Essential 20. RoseDog Books.
  • Cutting, J.E. (2016). Narrative Theory and the Cognitive Sciences. Projections, 10(1).
  • Bradbury, N.A. (2016). Attention Span During Lectures. Advances in Physiology Education, 40(2).
Section 3

Collective Identity and Social Bonding

The most consequential outcome of well-designed live shared experience is not entertainment in the transient sense. It is a measurable shift in how the people in the room relate to each other, and to the group they now share.

The theoretical framework comes from Social Identity Theory, first developed by Henri Tajfel and John Turner in the 1970s. Their central finding was that individuals derive a meaningful portion of their self-concept from membership in social groups, and that this group-based identity is not merely a label but an active psychological state that shapes perception, motivation, and behavior. When group identity is salient, when a person is thinking of themselves as a member of a "we" rather than as an isolated "I", they cooperate more readily, trust more readily, and invest more in collective outcomes.

The SIDE model (Social Identity Model of Deindividuation Effects), developed by Steve Reicher, Russell Spears, and Tom Postmes in the 1990s, refined this understanding by examining what actually happens to individual self-perception in group contexts. Earlier crowd psychology, from Gustave Le Bon's work forward, characterized group membership as a loss of self: the individual dissolves into the mob, rational behavior degrades, and the collective becomes governed by contagion and suggestion. The SIDE research tells a different and more precise story. What happens in a genuine shared group experience is not a loss of self but a reorganization of which self is salient. The personal identity, the particulars of the individual, recedes, and the categorical identity, membership in the group, becomes more prominent. This shift does not degrade behavior. It reorganizes it around group norms and shared values, which in most organizational contexts means increased cooperation, trust, and commitment.

The groundwork for this understanding was laid in laboratory conditions considerably earlier. The Hawthorne Studies, conducted at the Western Electric Hawthorne Works in Chicago between the late 1920s and early 1930s, produced a foundational observation: workers who were observed and treated as a group improved their performance regardless of the specific environmental conditions, not because of the physical changes researchers were testing, but because they felt they were part of something. Elton Mayo, who led the research team, noted that participants maintained their relationships and remained connected long after the study ended. The mechanism was not compensation, task design, or physical environment. It was the felt experience of group membership itself. Kurt Lewin, whose Research Center for Group Dynamics at MIT became the theoretical engine of social psychology in the 1940s, gave this observation its precise formulation: a group exists psychologically not because its members are similar or geographically proximate, but because they experience their fates as interdependent. That sense of shared fate, produced naturally by any genuine communal experience, is the precondition for the cooperation, trust, and commitment that follow.

Hopkins' research on collective effervescence identified the two pathways through which this identity shift occurs. Collective Self-Realization produces the "we" feeling through enactment, the group doing something together that embodies its shared values. Relationality produces it through intimacy, the experience of being genuinely seen and psychologically close to others in the room. Live entertainment, done well, activates both simultaneously. The group enacts an identity as people who were present for this specific experience. The shared genuine response (laughter, surprise, collective recognition) produces the intimacy pathway in parallel. Both mechanisms reinforce the same outcome: the transition from a collection of individuals to a group with a shared history.

The organizational consequences of this transition are documented in several research streams. Gallup's Q12 framework, developed through decades of research on employee engagement across industries, identifies work relationships as one of twelve factors with direct measurable impact on retention, productivity, and profitability. Highly engaged business units show 23% higher profitability and substantially lower absenteeism than disengaged units. Shared live experience with genuine emotional resonance is among the most efficient mechanisms available for building the relationship quality the Q12 measures. It compresses months of accumulated one-to-one interaction into a single shared event, because the neurochemical basis of the bonding (oxytocin synthesis, endorphin release, neural synchrony) is the same regardless of whether the trust was built gradually or generated in a room together.

The trust research adds a physiological dimension. Neural synchrony, the measurable alignment of brain activity between people who are attending to the same emotionally engaging stimulus, is one of the neurological signatures of interpersonal trust. When people mirror each other's emotional responses, when their physiological states converge through shared experience, the brain receives a signal that this person is aligned with me, which reduces social uncertainty and activates the prefrontal cortex to moderate the amygdala's default threat-detection response. The practical result is that people who have shared a genuine emotional experience together are measurably more likely to extend trust to each other in subsequent interactions, not because they decided to, but because the neurochemistry of the shared experience has already begun the process.

Live Entertainment
Sources
  • Tajfel, H. & Turner, J.C. (1979). An Integrative Theory of Intergroup Conflict. In The Social Psychology of Intergroup Relations.
  • Reicher, S., Spears, R., & Postmes, T. (1995). A Social Identity Model of Deindividuation Phenomena. European Review of Social Psychology, 6(1).
  • Hopkins, N., et al. (2015). British Journal of Social Psychology, 54(3).
  • Mayo, E. (1933). The Human Problems of an Industrial Civilization. Macmillan.
  • Lewin, K. (1948). Resolving Social Conflicts. Harper & Row.
  • Gallup (2023). State of the Global Workplace Report.
  • Dunbar, R.I.M. (2010). How Many Friends Does One Person Need? Faber & Faber.
  • Zak, P.J. (2017). The Neuroscience of Trust. Harvard Business Review, January-February.
Section 4

Participation vs. Passive Experience

The research literature on audience format is unambiguous on one point: active participation outperforms passive observation on every measure that matters.

A 2025 study of 1,551 participants examining the relationship between event format and audience outcomes found that active participation, defined as direct interaction with the experience rather than observation of it, reliably predicted higher feelings of social connection, enjoyment, and reported satisfaction. Passive observation, even of genuinely compelling content, produced substantially weaker scores on connection metrics. The effect held across demographic groups and venue types.

The neurological account of why connects to the same oxytocin-cortisol dynamic that Zak's immersion research documented. Passive observation of an engaging event can trigger the attention-orienting cortisol response and some degree of oxytocin synthesis. Active participation, particularly participation that involves genuine uncertainty and outcome, where the participant does not know what will happen next, produces the full arc of the neurochemical response. The brain treats genuine personal involvement differently from observation of someone else's involvement, even when the external content is identical.

This distinction extends further than it first appears. The relevant variable is not whether the audience member is on stage. It is whether what they are watching is genuinely happening, with authentic uncertainty about the outcome. Audiences watching others participate in an unpredictable, genuine experience, rather than watching a scripted performance, show the participation neurochemistry, not the passive-observation neurochemistry. The brain's mirror neuron system responds to genuine unscripted response the same way it would to direct participation: as something real, not as a representation of something real.

The social facilitation research established the foundational mechanism. Norman Triplett's work at Indiana University in 1898, the first laboratory experiment in social psychology, demonstrated that the presence of others engaged in a shared experience increases individual arousal and response. Floyd Allport's 1924 research on the audience effect refined this: the perception of being part of a shared event with others triggers heightened physiological engagement even without direct interaction. Robert Zajonc's Drive Theory (1965) provided the mechanism: shared contexts increase arousal, and that arousal amplifies dominant responses. For well-established social behaviors like laughter and surprise, increased arousal in a group context makes the response stronger, more genuine, and more contagious across the room.

The practical outcome is a hierarchy of event formats, ordered by the outcomes the research documents as valuable. At the top: formats where audience members themselves undergo genuine, unpredictable experiences in the presence of their peers. Below that: formats where audience members observe people they know undergoing genuine, unpredictable experiences. Below that: formats where audience members observe skilled professionals performing polished, scripted work. All three produce value. They do not produce it equally. The difference is not in production quality or entertainment skill. It is in the degree to which the human nervous system is processing what it sees as something real happening, because that is the condition under which the deepest neurochemical and social bonding responses activate.

Live Entertainment
Sources
  • Triplett, N. (1898). The Dynamogenic Factors in Pacemaking and Competition. American Journal of Psychology, 9(4).
  • Allport, F.H. (1924). Social Psychology. Houghton Mifflin.
  • Zajonc, R.B. (1965). Social Facilitation. Science, 149(3681).
  • Audience Engagement & Psychology research corpus (2026), 1,551-participant participation study.
  • Zak, P.J. (2015). Harvard Business Review.
Section 5

The History of Live Entertainment as a Social Technology

The history of organized live entertainment in professional and organizational contexts is not primarily a history of show business. It is a history of how institutions have used communal gathering as a deliberate mechanism for social cohesion, identity formation, and behavioral influence, and of how that use has moved, over two centuries, from intuitive practice to scientific documentation.

The industrial era established the template. George Pullman's model town south of Chicago, built beginning in 1880, was the 19th century's most systematic attempt to engineer community through managed collective experience. The Pullman Palace Car Company organized social events, provided entertainment venues, and structured the social life of its workers in the explicit belief that controlled communal gathering would produce loyal, productive employees. The model's collapse in the Pullman Strike of 1894, triggered when the company cut wages by 50% while holding rents and prices constant in its company-owned stores, revealed the limits of manufactured social experience: it cannot substitute for economic equity, and it does not survive betrayal of the underlying social contract. The federal commission that investigated the strike described Pullman's approach as "un-American." The Illinois Supreme Court ordered divestiture in 1898. The managed community experiment ended. The annual company picnic survived.

The postwar era shifted the scale and the mechanism. The 1950s rise of Las Vegas as a convention destination, formalized when the Nevada legislature authorized the Las Vegas Convention Center in 1955, opening in 1959, institutionalized the relationship between professional gathering and entertainment that had been developing informally since the traveling salesman culture of the 1880s. The Society for Incentive Travel Excellence (SITE), founded in New York in 1973, codified what corporate practitioners already understood empirically: that a well-designed shared experience produces loyalty and performance changes that monetary incentives do not replicate. The reasoning was straightforwardly neurological, even before neuroscience had the vocabulary for it: experiences engage emotional and social memory systems in ways that cash transfers do not.

The theoretical framework arrived formally in 1998, when B. Joseph Pine II and James H. Gilmore published "The Experience Economy" in the Harvard Business Review, later expanded into a book. Their central argument was that the economy had moved through successive stages, from commodities to goods to services, and had arrived at a fourth stage where the primary unit of economic value was the staged, memorable experience. In this model, businesses function as theatrical producers, and the events they create are not logistical deliverables but transformative encounters. Pine and Gilmore's formulation gave economic language to what anthropologists, theatrical producers, and event designers had been observing for a century: that experience is not the delivery of content, it is a change in the person who has it. The Greek theater designers who carved their stages into hillsides understood this. The Experience Economy gave it a business case and a balance sheet.

The 2008 financial crisis produced the accountability reckoning that the industry had previously avoided. When AIG, days after receiving an $85 billion federal bailout, spent $443,000 on a retreat at the St. Regis Resort Monarch Beach, the resulting public backlash (the "AIG effect") forced the entire corporate events sector to develop quantitative justification for expenditures that had previously been defended on cultural grounds. The Phillips ROI Methodology, extending Donald Kirkpatrick's four-level training evaluation framework with a fifth level of financial return, became the industry standard for connecting event costs to measurable organizational outcomes: sales growth, productivity increases, retention rates, engagement scores. What had been understood intuitively, that live shared experience produces organizational value, was now required to be expressed in CFO-ready metrics.

The research trajectory completed a circle that had been running for two centuries. The psychological mechanisms that Pullman's social engineers had exploited by instinct, that Pine and Gilmore had framed economically, and that the post-AIG accountability regime demanded be quantified, were by the early 21st century documented in peer-reviewed journals and expressible in the language of neuroscience. The social technology had always been there. The science caught up.

Live Entertainment
Sources
  • Pine, B.J. & Gilmore, J.H. (1998). Welcome to the Experience Economy. Harvard Business Review, July-August.
  • Events Industry Council / Oxford Economics (2023). Global Economic Significance of Business Events.
  • Phillips, J.J. & Phillips, P.P. (2007). Return on Investment in Meetings and Events. Butterworth-Heinemann.
  • History of Corporate Entertainment research corpus (2026), compiled research files.
  • Kirkpatrick, D.L. (1959). Techniques for Evaluating Training Programs. Journal of the American Society of Training Directors, 13(11).
Section 6

Comedy Hypnosis as a Live Experience

The hypnosis page on this site explains what hypnosis is: the neurological state, the mechanism of suggestibility, the century of clinical and scientific research behind it. This section is not about what hypnosis is. It is about why a comedy hypnosis show produces the specific outcomes that the preceding five sections have been documenting, and why it produces them more completely and simultaneously than almost any other live format available.

Every mechanism described in this document is present in a well-executed comedy hypnosis show. What makes the format distinctive is the degree to which all of them activate at once.

The shared genuine surprise that the research identifies as one of the most powerful memory anchors in live experience is not a production effect in a comedy hypnosis show. It is the product of the show. When a volunteer undergoes a genuine hypnotic response, an involuntary physical or behavioral reaction they did not choose and could not have scripted, the audience's mirror neuron system activates as though they are partially undergoing the same experience. The brain does not process this the way it processes watching a skilled performer execute a rehearsed trick. It processes it as something real happening to someone in the room. The neurological response is categorically different from the response to scripted performance, and the memory encoding that follows is correspondingly stronger and more durable.

The laughter that results activates exactly the group endorphin release that the 2017 Finnish research documented. Because the source of the laughter is something genuine (the volunteer's actual involuntary response, their actual surprise, their actual delight at what their own mind is doing) the social facilitation dynamic amplifies it in the way Zajonc's Drive Theory predicts. Arousal increases. Dominant responses (laughter, surprise) intensify. The contagion effect runs through the room because every person present knows they are watching something real, and that shared knowledge removes the interpretive gap between stimulus and response. The result is the vocal grooming effect Dunbar documented: the entire room bonding simultaneously through a mechanism that one-to-one conversation cannot replicate at scale.

Kahneman's architecture applies with unusual precision. A comedy hypnosis show generates its peak through genuine involuntary response, moments the audience did not predict, cannot explain in ordinary terms, and could not have anticipated. Those moments are the definition of a peak experience in Kahneman's framework: emotionally intense, unexpected, and tagged by the amygdala for priority long-term storage. The show closes on a strong positive ending by the logic of the format itself, and duration neglect ensures that the arc from opening to peak to close is what the audience carries home, not a minute-by-minute accounting of the full runtime.

The SIDE model's identity shift from "I" to "we" does not happen once in this format. It happens continuously. The audience arrived as individuals. Within minutes of the show's opening, they are a group defined by having witnessed the same unexpected thing together. That shared reference accumulates across the course of the show, reinforcing with each new genuine response from the stage. By the end, the group has a common vocabulary of specific moments (this person's reaction, that suggestion, the thing that happened that nobody expected) that belongs exclusively to the people who were in that room that night. That is not a side effect of the entertainment. That is the mechanism by which the entertainment produces the social bonding outcomes the research documents.

The participation research finding, that watching others undergo genuine, unpredictable experiences produces the participation neurochemistry rather than the passive-observation neurochemistry, describes the audience's experience precisely. They are not watching a performer demonstrate a skill. They are watching people they recognize (colleagues, classmates, coworkers) undergo something real with genuine uncertainty about the outcome. The brain responds to that authenticity. It cannot do otherwise.

None of this was engineered into the comedy hypnosis format as a deliberate design decision. The format did not set out to optimize for Peak-End encoding, or to trigger the Hopkins CSR and Relationality pathways simultaneously, or to produce the Dunbar vocal grooming effect at scale. It produces these outcomes because it satisfies the conditions under which these mechanisms naturally activate: live, genuine, participatory, surprise-forward, communal, with authentic uncertainty baked into the structure. The science describes what was already happening. It did not prescribe it.

For the underlying science of what hypnosis is and how the neurological state operates, see the companion page: The Science of Hypnosis & Influence.

Live Entertainment
Sources
  • Manninen, S., et al. (2017). Journal of Neuroscience, 37(25).
  • Kahneman, D. & Fredrickson, B.L. (1993). Journal of Personality and Social Psychology, 65(1).
  • Reicher, S., Spears, R., & Postmes, T. (1995). European Review of Social Psychology, 6(1).
  • Hopkins, N., et al. (2015). British Journal of Social Psychology, 54(3).
  • Dunbar, R.I.M. (2012). Philosophical Transactions of the Royal Society B.
  • Zajonc, R.B. (1965). Science, 149(3681).