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  • 1.
    Andrews, George
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Integer Partitions2004Book (Other (popular science, discussion, etc.))
  • 2.
    Bernard, Mark
    et al.
    Maastricht University .
    Dreber, Anna
    Stockholm School of Economics.
    Strimling, Pontus
    Stockholm University.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    The subgroup problem: When can binding voting on extractions from a common resource pool overcome the tragedy of the commons?2013In: Journal of Economic Behavior and Organization, ISSN 0167-2681, E-ISSN 1879-1751, Vol. 91, p. 122-130Article in journal (Refereed)
    Abstract [en]

    Using a common pool resource game protocol with voting we examine experimentally how cooperation varies with the level at which (binding) votes are aggregated. Our results are broadly in line with theoretical predictions. When players can vote on the behavior of the whole group or when leaders from each group can vote for the group as a whole, extraction levels from the common resource pool are close to the social optimum. When players extract resources individually, there is substantial overextraction. When players vote in subgroups, there is initially less overextraction but it increases over time. This suggests that in order for binding voting to overcome the tragedy of the commons in social dilemmas, it should ideally affect the group as a whole.

  • 3.
    Cownden, Daniel
    et al.
    Univ Glasgow, Scotland.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm Univ, Stockholm, Sweden.
    Strimling, Pontus
    Stockholm Univ, Stockholm, Sweden.
    A popular misapplication of evolutionary modeling to the study of human cooperation2017In: Evolution and human behavior, ISSN 1090-5138, E-ISSN 1879-0607, Vol. 38, no 3, p. 421-427Article in journal (Refereed)
    Abstract [en]

    To examine the evolutionary basis of a behavior, an established approach (known as the phenotypic gambit) is to assume that the behavior is controlled by a single allele, the fitness effects of which are derived from a consideration of how the behavior interacts, via life-history, with other ecological factors. Here we contrast successful applications of this approach with several examples of an influential and superficially similar line of research on the evolutionary basis of human cooperation. A key difference is identified: in the latter line of research the focal behavior, cooperation, is abstractly defined in terms of immediate fitness costs and benefits. Selection is then assumed to act on strategies in an iterated social context for which fitness effects can be derived by aggregation of the abstractly defined immediate fitness effects over a lifetime. This approach creates a closed theoretical loop, rendering models incapable of making predictions or providing insight into the origin of human cooperation. We conclude with a discussion of how evolutionary approaches might be appropriately used in the study of human social behavior. (C) 2017 Elsevier Inc. All rights reserved.

  • 4.
    Cownden, Daniel
    et al.
    University of St Andrews, Scotland.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Sweden.
    Strimling, Pontus
    Stockholm University, Sweden.
    The implications of learning across perceptually and strategically distinct situations2018In: Synthese, ISSN 0039-7857, E-ISSN 1573-0964, Vol. 195, no 2, p. 511-528Article in journal (Refereed)
    Abstract [en]

    Game theory is a formal approach to behavior that focuses on the strategic aspect of situations. The game theoretic approach originates in economics but has been embraced by scholars across disciplines, including many philosophers and biologists. This approach has an important weakness: the strategic aspect of a situation, which is its defining quality in game theory, is often not its most salient quality in human (or animal) cognition. Evidence from a wide range of experiments highlights this shortcoming. Previous theoretical and empirical work has sought to address this weakness by considering learning across an ensemble of multiple games simultaneously. Here we extend this framework, incorporating artificial neural networks, to allow for an investigation of the interaction between the perceptual and functional similarity of the games composing the larger ensemble. Using this framework, we conduct a theoretical investigation of a population that encounters both stag hunts and prisoner's dilemmas, two situations that are strategically different but which may or may not be perceptually similar.

  • 5.
    de Barra, Mícheál
    et al.
    Centre for the Study of Cultural Evolution, Stockholm, Sweden.
    Eriksson, Kimmo
    Centre for the Study of Cultural Evolution, Stockholm, Sweden.
    Strimling, Pontus
    Centre for the Study of Cultural Evolution, Stockholm, Sweden.
    How feedback biases give ineffective medical treatments a good reputation.2014In: Journal of medical Internet research, ISSN 1438-8871, Vol. 16, no 8, p. e193-Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Medical treatments with no direct effect (like homeopathy) or that cause harm (like bloodletting) are common across cultures and throughout history. How do such treatments spread and persist? Most medical treatments result in a range of outcomes: some people improve while others deteriorate. If the people who improve are more inclined to tell others about their experiences than the people who deteriorate, ineffective or even harmful treatments can maintain a good reputation.

    OBJECTIVE: The intent of this study was to test the hypothesis that positive outcomes are overrepresented in online medical product reviews, to examine if this reputational distortion is large enough to bias people's decisions, and to explore the implications of this bias for the cultural evolution of medical treatments.

    METHODS: We compared outcomes of weight loss treatments and fertility treatments in clinical trials to outcomes reported in 1901 reviews on Amazon. Then, in a series of experiments, we evaluated people's choice of weight loss diet after reading different reviews. Finally, a mathematical model was used to examine if this bias could result in less effective treatments having a better reputation than more effective treatments.

    RESULTS: Data are consistent with the hypothesis that people with better outcomes are more inclined to write reviews. After 6 months on the diet, 93% (64/69) of online reviewers reported a weight loss of 10 kg or more while just 27% (19/71) of clinical trial participants experienced this level of weight change. A similar positive distortion was found in fertility treatment reviews. In a series of experiments, we show that people are more inclined to begin a diet with many positive reviews, than a diet with reviews that are representative of the diet's true effect. A mathematical model of medical cultural evolution shows that the size of the positive distortion critically depends on the shape of the outcome distribution.

    CONCLUSIONS: Online reviews overestimate the benefits of medical treatments, probably because people with negative outcomes are less inclined to tell others about their experiences. This bias can enable ineffective medical treatments to maintain a good reputation.

  • 6. Enquist, Magnus
    et al.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Mänsklig kultur – vad är det för speciellt med den?2007In: Tvärsnitt, no 2, p. 10-11Article in journal (Other (popular science, discussion, etc.))
  • 7.
    Enquist, Magnus
    et al.
    Stockholm University.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Ghirlanda, Stefano
    Stockholm University.
    Critical Social Learning: A Solution to Rogers's Paradox of Nonadaptive Culture2007In: American Anthropologist, ISSN 0002-7294, E-ISSN 1548-1433, Vol. 109, no 4, p. 727-734Article in journal (Refereed)
    Abstract [en]

    Alan Rogers (1988) presented a game theory model of the evolution of social learning, yielding the paradoxical conclusion that social learning does not increase the fitness of a population. We expand on this model, allowing for imperfections in individual and social learning as well as incorporating a "critical social learning" strategy that tries to solve an adaptive problem first by social learning, and then by individual learning if socially acquired behavior proves unsatisfactory. This strategy always proves superior to pure social learning and typically has higher fitness than pure individual learning, providing a solution to Rogers's paradox of nonadaptive culture. Critical social learning is an evolutionarily stable strategy (ESS) unless cultural transmission is highly unfaithful, the environment is highly variable, or social learning is much more costly than individual learning. We compare the model to empirical data on social learning and on spatial variation in primate cultures and list three requirements for adaptive culture. © 2007 by the American Anthropological Association.

  • 8.
    Enquist, Magnus
    et al.
    Stockholms universitet, Centrum för evolutionär kulturforskning.
    Ghirlanda, Stefano
    Brooklyn College of the City University New York, Department of Psychology and Honors Academy.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    Modelling the evolution and diversity of cumulative culture2011In: Philosophical Transactions of the Royal Society of London. Biological Sciences, ISSN 0962-8436, E-ISSN 1471-2970, Vol. 366, no 1563, p. 412-423Article in journal (Refereed)
    Abstract [en]

    Previous work on mathematical models of cultural evolution has mainly focused on the diffusion of simple cultural elements. However, a characteristic feature of human cultural evolution is the seemingly limitless appearance of new and increasingly complex cultural elements. Here, we develop a general modelling framework to study such cumulative processes, in which we assume that the appearance and disappearance of cultural elements are stochastic events that depend on the current state of culture. Five scenarios are explored: evolution of independent cultural elements, stepwise modification of elements, differentiation or combination of elements and systems of cultural elements. As one application of our framework, we study the evolution of cultural diversity (in time as well as between groups).

  • 9.
    Enquist, Magnus
    et al.
    Stockholm University.
    Strimling, Pontus
    Stockholm University.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    Laland, Kevin
    University of St Andrews.
    Sjöstrand, Jonas
    Stockholm University.
    One cultural parent makes no culture2010In: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 79, no 6, p. 1353-1362Article in journal (Refereed)
    Abstract [en]

    The ability to acquire knowledge and skills from others is widespread in animals and is commonly thought to be responsible for the behavioural traditions observed in many species. However, in spite of the extensive literature on theoretical analyses and empirical studies of social learning, little attention has been given to whether individuals acquire knowledge from a single individual or multiple models. Researchers commonly refer to instances of sons learning from fathers, or daughters from mothers, while theoreticians have constructed models of uniparental transmission, with little consideration of whether such restricted modes of transmission are actually feasible. We used mathematical models to demonstrate that the conditions under which learning from a single cultural parent can lead to stable culture are surprisingly restricted ( the same reasoning applies to a single social-learning event). Conversely, we demonstrate how learning from more than one cultural parent can establish culture, and find that cultural traits will reach a nonzero equilibrium in the population provided the product of the fidelity of social learning and the number of cultural parents exceeds 1. We discuss the implications of the analysis for interpreting various findings in the animal social-learning literature, as well as the unique features of human culture.

  • 10. Eriksson, Henrik
    et al.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    Conjugacy of Coxeter elements2009In: The Electronic Journal of Combinatorics, ISSN 1097-1440, E-ISSN 1077-8926, Vol. 16, no 2, p. R4-Article in journal (Refereed)
  • 11. Eriksson, Henrik
    et al.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    Words with intervening neighbours in infinite Coxeter groups are reduced2010In: The Electronic Journal of Combinatorics, ISSN 1097-1440, E-ISSN 1077-8926, Vol. 17, no 1, p. N19-Article in journal (Refereed)
  • 12.
    Eriksson, Henrik
    et al.
    KTH.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Linusson, Svante
    KTH.
    Wästlund, Johan
    Linköpings universitet.
    Dense packing of patterns in a permutation2007In: Annals of Combinatorics, ISSN 0218-0006, E-ISSN 0219-3094, Vol. 11, no 3/4, p. 459-470Article in journal (Refereed)
  • 13.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    A Note on the Exact Expected Length of the kth Part of a Random Partition2010In: Integers, ISSN 1867-0652, Vol. 10, p. 309-311Article in journal (Refereed)
    Abstract [en]

    Kessler and Livingstone proved an asymptotic formula for the expected length of the largest part of a partition drawn uniformly at random. As a first step they gave an exact formula expressed as a weighted sum of Euler's partition function. Here we give a short bijective proof of a generalization of this exact formula to the expected length of the kth part.

  • 14.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    Autism-spectrum traits predict humor styles in the general population2013In: Humor: An International Journal of Humor Research, ISSN 0933-1719, E-ISSN 1613-3722, Vol. 26, no 3, p. 461-475Article in journal (Refereed)
    Abstract [en]

    Previous research shows that individuals with Asperger syndrome or high-functioning autism tend to have impaired processing of humor and laugh at things that are not commonly found funny. Here the relationship between humor styles and the broader autism phenotype was investigated in a sample of the general population. The autism-spectrum quotient (AQ) and the humor styles questionnaire (HSQ) were administered to six hundred US participants recruited through an Internet-based service. On the whole, high scores on AQ were negatively related to positive humor styles and unrelated to negative humor styles. However, AQ subscales representing different autism-spectrum traits exhibited different patterns. In particular, the factor "poor mind-reading" was associated with higher scores on negative humor styles and the factor "attention to detail" was associated with higher scores on all humor styles, suggesting a more nuanced picture of the relationship between autism-spectrum traits and humor.

  • 15.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Comment on “The Evolution of Cultural Complexity: Not by the Treadmill Alone” by Andersson & Read2016In: Current Anthropology, ISSN 0011-3204, E-ISSN 1537-5382, Vol. 57, p. 275-276Article in journal (Other academic)
    Abstract [en]

    At the end of their thoughtful target article, Andersson and Read conclude that formal models of cultural evolution are “useful but must be kept in perspective.” As a mathematician with a great interest in social science, I have some experience of working with such models. Based on this experience, I very much agree with the “but” part of the above conclusion. I see a clear tendency in the cultural evolution literature to put too much trust in the value of formal models.

  • 16.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Ethnographic stories of cooperation and algebraic stories of evolution2007In: Journal of Evolutionary Psychology, ISSN 0737-4828, Vol. 5, no 1-4, p. 245-250Article, book review (Other (popular science, discussion, etc.))
  • 17.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Humaniora och matematik – visst går de ihop2006In: Tvärsnitt, ISSN 0348-7997, no 3, p. 12-15Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Matematik är inte bara torra siffror. Det är resonemang och teori som är ämnets kärna. Matematiken erbjuder metoder som gör det svåra lättare att förstå. Därför behöver även humanister få sig lite matte till livs, menar matematikprofessorn Kimmo Eriksson.

  • 18.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Matematikens baksida2006In: Folkvett, ISSN 0283-0795, no 4Article in journal (Other (popular science, discussion, etc.))
  • 19.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    Repeated learning and cultural evolution2012In: Encyclopedia of the Sciences of Learning / [ed] Norbert M. Seel, Springer-Verlag New York, 2012, no 20, p. 2824-2825Chapter in book (Refereed)
  • 20.
    Eriksson, Kimmo
    Mälardalen University, Department of Mathematics and Physics.
    Statistical and combinatorial aspects of comparative genomics2004In: Scandinavian Journal of Statistics, ISSN 0303-6898, Vol. 31, no 2, p. 203-216Article, review/survey (Refereed)
    Abstract [en]

    This document presents a survey of the statistical and combinatorial aspects of four areas of comparative genomics: gene order based measures of evolutionary distances between species, construction of phylogenetic trees, detection of horizontal transfer of genes, and detection of ancient whole genome duplications.

  • 21.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    The Accuracy of Mathematical Models of Justice Evaluations2012In: The Journal of mathematical sociology, ISSN 0022-250X, E-ISSN 1545-5874, Vol. 36, no 2, p. 125-135Article in journal (Refereed)
    Abstract [en]

    Jasso (1978) proposed a universal law of justice evaluations describing a logarithmic relationship between the perceived injustice of a reward and the ratio between this reward and the just reward. In applications this model is treated as if it were exact, whereas analogous models in psychophysics have empirically established degrees of uncertainty. In this article I make the first assessment of the magnitude of error in the logarithmic model of justice evaluations, using published data and a novel experiment. For the standard application of the model, where just rewards are inferred from justice evaluations, I find that the inherent inaccuracy leads to errors of about 15% on average. I also compared the logarithmic model to 2 nonlogarithmic models. Almost 20% of my respondents made justice evaluations that were more consistent with one of the latter models, suggesting that no single model is really universal.

  • 22.
    Eriksson, Kimmo
    Mälardalen University, School of Education, Culture and Communication.
    The nonsense math effect2012In: Judgment and decision making, ISSN 1930-2975, E-ISSN 1930-2975, Vol. 7, no 6, p. 746-749Article in journal (Refereed)
    Abstract [en]

    Mathematics is a fundamental tool of research. Although potentially applicable in every discipline, the amount of training in mathematics that students typically receive varies greatly between different disciplines. In those disciplines where most researchers do not master mathematics, the use of mathematics may be held in too much awe. To demonstrate this I conducted an online experiment with 200 participants, all of which had experience of reading research reports anda postgraduate degree (in any subject). Participants were presented with the abstracts from two published papers (one inevolutionary anthropology and one in sociology). Based on these abstracts, participants were asked to judge the quality of the research. Either one or the other of the two abstracts was manipulated through the inclusion of an extra sentence taken from a completely unrelated paper and presenting an equation that made no sense in the context. The abstract that included the meaningless mathematics tended to be judged of higher quality. However, this "nonsense math effect" was not found among participants with degrees in mathematics, science, technology or medicine.

  • 23. Eriksson, Kimmo
    Vad anser MBA-studenter om lön och kön?2005In: Ekonomisk Debatt, ISSN 0345-2646, no 2, p. 49-52Article in journal (Other academic)
  • 24.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Stockholm, Sweden.
    Andersson, P. A.
    Linköping University, Sweden.
    Strimling, P.
    Stockholm University, Sweden; Linköping University, Sweden.
    Moderators of the disapproval of peer punishment2016In: Group Processes & Intergroup Relations, ISSN 1368-4302, E-ISSN 1461-7188, Vol. 19, no 2, p. 152-168Article in journal (Refereed)
    Abstract [en]

    Recent studies have found disapproval of peer punishment of norm violations. This seems puzzling, given the potential benefits peer punishers contribute to the group. We suggest part of the answer is that peer punishers tend to come across as aggressive and as such may be viewed as more problematic than beneficial to have around. We used simple computer animations of geometric shapes to enact 15 precise variations of social sanctions against a norm violator. More than 1,800 subjects were recruited to watch an animation and judge the behavior and character of the animated agents. They also completed a trait aggression measure. Across the variations peer punishment was typically disapproved of, especially when severe or openly aggressive, and especially by subjects low on trait aggression. We conclude that there seems to be a social norm against peer punishment and that dislike of aggressiveness seems to be part of the reason why.

  • 25.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Andersson, P. A.
    Linköping University, Linköping, Sweden.
    Strimling, P.
    Stockholm University, Stockholm, Sweden.
    When is it appropriate to reprimand a norm violation?: The roles of anger, behavioral consequences, violation severity, and social distance2017In: Judgment and decision making, ISSN 1930-2975, E-ISSN 1930-2975, Vol. 12, no 4, p. 396-407Article in journal (Refereed)
    Abstract [en]

    Experiments on economic games typically fail to find positive reputational effects of using peer punishment of selfish behavior in social dilemmas. Theorists had expected positive reputational effects because of the potentially beneficial consequences that punishment may have on norm violators’ behavior. Going beyond the game-theoretic paradigm, we used vignettes to study how various social factors influence approval ratings of a peer who reprimands a violator of a group-beneficial norm. We found that ratings declined when punishers showed anger, and this effect was mediated by perceived aggressiveness. Thus the same emotions that motivate peer punishers may make them come across as aggressive, to the detriment of their reputation. However, the negative effect of showing anger disappeared when the norm violation was sufficiently severe. Ratings of punishers were also influenced by social distance, such that it is less appropriate for a stranger than a friend to reprimand a violator. In sum, peer punisher ratings were very high for a friend reprimanding a severe norm violation, but particularly poor for a stranger showing anger at a mild norm violation. We found no effect on ratings of whether the reprimand had the beneficial consequence of changing the violator’s behavior. Our findings provide insight into how peer punishers can avoid negative reputational effects. They also point to the importance of going beyond economic games when studying peer punishment. 

  • 26.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Bailey, Drew
    Geary, David
    The grammar of approximating number pairs2010In: Memory & Cognition, ISSN 0090-502X, E-ISSN 1532-5946, Vol. 38, no 3, p. 333-343Article in journal (Refereed)
    Abstract [en]

    In the present article, we studied approximating pairs of numbers (a, b) that were used to estimate quantity in a single phrase ("two, three years ago"). Pollmann and Jansen (1996) found that only a few of the many possible pairs are actually used, suggesting an interaction between the ways in which people estimate quantity and their use of quantitative phrases in colloquial speech. They proposed a set of rules that describe which approximating pairs are used in Dutch phrases. We revisited this issue in an analysis of Swedish and American language corpora and in a series of three experiments in which Swedish and American adults rated the acceptability of various approximating pairs and created approximating pairs of their own in response to various estimation tasks. We found evidence for Pollmann and Jansen's rules in both Swedish and English phrases, but we also identified additional rules and substantial individual and cross-language variation. We will discuss implications for the origin of this loose "grammar" of approximating pairs.

  • 27.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Berglund, Lasse
    Jonsson, Mikael
    Gavel, Hillevi
    Mälardalen University, School of Education, Culture and Communication.
    Tal och Rum: S kurs B2008Book (Other (popular science, discussion, etc.))
  • 28.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Stockholm, Sweden.
    Coultas, J. C.
    Stockholm University, Sweden.
    De Barra, M.
    Stockholm University, Sweden.
    Cross-Cultural Differences in Emotional Selection on Transmission of Information2016In: Journal of Cognition and Culture, ISSN 1567-7095, E-ISSN 1568-5373, Vol. 16, no 1-2, p. 122-143Article in journal (Refereed)
    Abstract [en]

    Research on cultural transmission among Americans has established a bias for transmitting stories that have disgusting elements (such as exposure to rats and maggots). Conceived of as a cultural evolutionary force, this phenomenon is one type of emotional selection. In a series of online studies with Americans and Indians we investigate whether there are cultural differences in emotional selection, such that the transmission process favours different kinds of content in different countries. The first study found a bias for disgusting content (rats and maggots) among Americans but not among Indians. Four subsequent studies focused on how country interacts with kind of emotional content (disgusting vs. happy surprises and good news) in reactions to transmission of stories or information. Whereas Indian participants, compared to Americans, tended to be less interested in, and excited by, transmission of stories and news involving common disgust-elicitors (like rats), the opposite pattern held for transmission of happy surprises and good news (e.g., the opening of a new public facility). We discuss various possible explanations and implications. 

  • 29.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Coultas, Julie
    University of Sussex.
    Are people really conformist-biased?: An empirical test and a new mathematical model2009In: Journal of Evolutionary Psychology, ISSN 0737-4828, Vol. 7, no 1, p. 5-21Article in journal (Refereed)
    Abstract [en]

    According to an influential theory in cultural evolution, within-group similarity of culture is explained by a human conformist-bias, which is a hypothesized evolved predisposition to preferentially follow a member of the majority when acquiring ideas and behaviours. However, this notion has little support from social psychological research. In fact, a major theory in social psychology (Latan and Wolf (1981) argues for what is in effect a nonconformist-bias: by analogy to standard psychophysics they predict minority sources of influence to have relatively greater impact than majority sources. Here we present a new mathematical model and an experiment on social influence, both specifically designed to test these competing predictions. The results are in line with nonconformism. Finally, we discuss within-group similarity and suggest that it is not a general phenomenon but must be studied trait by trait.

  • 30.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Coultas, Julie
    Department of Psychology, University of Sussex.
    Theory of conformist social learning2012In: Encyclopedia of the Sciences of Learning / [ed] Norbert M Seel, Springer-Verlag New York, 2012, no 20, p. 3314-3316Chapter in book (Refereed)
  • 31.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Coultas, Julie C.
    Stockholm University.
    Corpses, maggots, poodles and rats: Emotional selection operating in three phases of cultural transmission of urban legends2014In: Journal of Cognition and Culture, ISSN 1567-7095, E-ISSN 1568-5373, Vol. 14, no 1-2, p. 1-26Article in journal (Refereed)
    Abstract [en]

    In one conception of cultural evolution, the evolutionary success of cultural units that are transmitted from individual to individual is determined by forces of cultural selection. Here we argue that it is helpful to distinguish between several distinct phases of the transmission process in which cultural selection can operate, such as a choose-toreceive phase, an encode-and-retrieve phase, and a choose-to-transmit phase. Here we focus on emotional selection in cultural transmission of urban legends, which has previously been shown to operate in the choose-to-transmit phase. In a series of experiments we studied serial transmission of stories based on urban legends manipulated to be either high or low on disgusting content. Results supported emotional selection operating in all three phases of cultural transmission. Thus, the prevalence of disgusting urban legends in North America may be explained by emotional selection through a multitude of pathways. 

  • 32.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Coultas, Julie C.
    Univ Sussex, Brighton.
    The advantage of multiple cultural parents in the cultural transmission of stories2012In: Evolution and human behavior, ISSN 1090-5138, E-ISSN 1879-0607, Vol. 33, no 4, p. 251-259Article in journal (Refereed)
    Abstract [en]

    Recent mathematical modeling of repeated cultural transmission has shown that the rate at which culture is lost (due to imperfect transmission) will crucially depend on whether individuals receive transmissions from many cultural parents or only from one. However, the modeling assumptions leading up to this conclusion have so far not been empirically assessed. Here we do this for the special case of transmission chains where each individual either receives the same story twice from one cultural parent (and retransmits twice to a cultural child) or receives possibly different versions of the story from two cultural parents (and then retransmits to two cultural children). For this case, we first developed a more general mathematical model of cultural retention that takes into account the possibility of dependence of error rates between transmissions. In this model, under quite plausible assumptions, chains with two cultural parents will have superior retention of culture. This prediction was then tested in two experiments using both written and oral modes of transmission. In both cases, superior retention of culture was found in chains with two cultural parents. Estimation of model parameters indicated that error rates were not identical and independent between transmissions; instead, a primacy effect was suggested, such that the first transmission tends to have higher fidelity than the second transmission.

  • 33.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Center for the Study of Cultural Evolution, Stockholm University, Sweden.
    Cownden, Daniel
    Center for the Study of Cultural Evolution, Stockholm University, Sweden.
    Ehn, Micael
    Center for the Study of Cultural Evolution, Stockholm University, Sweden.
    Strimling, Pontus
    Center for the Study of Cultural Evolution, Stockholm University, Sweden.
    ‘Altruistic’ and ‘antisocial ’ punishers are one and the same2014In: Review of Behavioral Economics, ISSN 2326-6198, E-ISSN 2326-6201, Vol. 1, no 3, p. 1-13Article in journal (Refereed)
  • 34.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm Univ, Stockholm, Sweden.
    Cownden, Daniel
    Stockholm Univ, Stockholm, Sweden.
    Strimling, Pontus
    Stockholm Univ, Stockholm, Sweden.
    Social learning may lead to population level conformity without individual level frequency bias2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 17341Article in journal (Refereed)
    Abstract [en]

    A requirement of culture, whether animal or human, is some degree of conformity of behavior within populations. Researchers of gene-culture coevolution have suggested that population level conformity may result from frequency-biased social learning: individuals sampling multiple role models and preferentially adopting the majority behavior in the sample. When learning from a single role model, frequency-bias is not possible. We show why a population-level trend, either conformist or anticonformist, may nonetheless be almost inevitable in a population of individuals that learn through social enhancement, that is, using observations of others' behavior to update their own probability of using a behavior in the future. The exact specification of individuals' updating rule determines the direction of the trend. These results offer a new interpretation of previous findings from simulations of social enhancement in combination with reinforcement learning, and demonstrate how results of dynamical models may strongly depend on seemingly innocuous choices of model specifications, and how important it is to obtain empirical data on which to base such choices.

  • 35.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Enquist, Magnus
    Stockholm University.
    Ghirlanda, Stefano
    Stockholm University.
    Critical points in current theory of conformist social learning2007In: Journal of Evolutionary Psychology, ISSN 0737-4828, Vol. 5, no 1, p. 67-87Article in journal (Refereed)
    Abstract [en]

    Existing mathematical models suggest that gene-culture coevolution favours a conformist bias in social learning, that is, a psychological mechanism to preferentially acquire the most common cultural variants. Here we show that this conclusion relies on specific assumptions that seem unrealistic, such as that all cultural variants are known to every individual. We present two models that remove these assumptions, showing that: 1) the rate of cultural evolution and the adaptive value of culture are higher in a population in which individuals pick cultural variants at random ( Random strategy) rather than picking the most common one ( Conform strategy); 2) in genetic evolution the Random strategy out-competes the Conform strategy, unless cultural evolution is very slow, in which caseConform and Random usually coexist; 3) the individuals’ ability to evaluate cultural variants is a more important determinant of the adaptive value of culture than frequency-based choice strategies. We also review existing empirical literature and game-theoretic arguments for conformity, finding neither strong empirical evidence nor a strong theoretical expectation for a general conformist bias. Our own vignette study of social learning shows that people may indeed use different social learning strategies depending on context.

  • 36.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Sweden.
    Funcke, Alexander
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Sweden; Harvard University, United States .
    A Below-Average Effect with Respect to American Political Stereotypes on Warmth and Competence2015In: Political Psychology, ISSN 0162-895X, E-ISSN 1467-9221, Vol. 36, no 3, p. 341-350Article in journal (Refereed)
    Abstract [en]

    The "above-average effect" is the phenomenon that people tend to judge themselves above average on desirable traits. Based on social identity theory, we propose that a "below-average effect" may arise when individuals rate themselves and the average ingroup member on traits stereotypically associated with the ingroup. In two studies, Republican and Democrat participants rated themselves and the average political ingroup member on possession of desirable traits related to warmth and competence. Current political stereotypes in America associate the former dimension with Democrats and the latter with Republicans. Consistent with our hypothesis, the above-average effect was moderated by political group and dimension in interaction. In particular, Democrats rated themselves below the average Democrat on warmth and Republicans rated themselves below the average Republican on competence. 

  • 37.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Funcke, Alexander
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Humble Self-Enhancement: Religiosity and the Better-Than-Average Effect2014In: Social Psychology and Personality Science, ISSN 1948-5506, E-ISSN 1948-5514, Vol. 5, no 1, p. 76-83Article in journal (Refereed)
    Abstract [en]

    Prior research has linked religiosity to certain forms of self-enhancement. We extend this literature by three studies linking religiosity to the well-established better-than-average effect (BAE). First, a reanalysis of self-judgments of desirable characteristics in 15 nations showed that the BAE was stronger in more religious countries, even taking into account gross domestic product, interdependence, and economic inequality. Second, in two online surveys totaling 1,000 Americans, the BAE was stronger among more religious individuals. Several observations indicated that this relation was due to individuals self-stereotyping with respect to their religious in-groups. In particular, the relation was restricted to characteristics on the warmth dimension, consistent with the religious stereotype, and the average religious in-group member tended to be judged even more favorably than self. The latter phenomenon, which we term humble self-enhancement, is consistent with other studies linking stronger religiosity to greater favoritism of the religious in-group and greater derogation of religious out-groups. 

  • 38.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Gavel, Hillevi
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Diskret matematik: Fördjupning2003Book (Other (popular science, discussion, etc.))
  • 39.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Gavel, Hillevi
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Diskret matematik och diskreta modeller2013 (ed. 2)Book (Other academic)
  • 40.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Gavel, Hillevi
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Diskret matematik och diskreta modeller2002Book (Other (popular science, discussion, etc.))
  • 41.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Gavel, Hillevi
    Mälardalen University, School of Education, Culture and Communication.
    Exploring the Educational Possibilities of Computer Games for 7th Grade Math2010In: Computer Games: learning objectives, cognitive performance and effects on development / [ed] Agustin Soria and Julián Maldonado, Nova Publishers , 2010, p. 167-191Chapter in book (Other (popular science, discussion, etc.))
  • 42.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Gavel, Hillevi
    Mälardalen University, Department of Mathematics and Physics.
    Goal-based reform of first-year discrete mathematics: A Swedish case study2003In: Teaching Mathematics and its Applications, ISSN 0268-3679, E-ISSN 1471-6976, no 1, p. 7-15Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    We discuss a fundamental reform of the way discrete mathematics is taught at Mälardalen University. The background to this reform was a complete revision of the goals of the course, which now focus on skills rather than subject matter.

  • 43.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Gavel, Hillevi
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Berglund, Lasse
    Jonsson, Mikael
    Tal och Rum: NT kurs AB2007Book (Other (popular science, discussion, etc.))
  • 44.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Gavel, Hillevi
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Berglund, Lasse
    Jonsson, Mikael
    Tal och Rum: S kurs A2007Book (Other (popular science, discussion, etc.))
  • 45.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University.
    Haggstrom, Olle
    Chalmers University of Technology, Sweden.
    Lord's Paradox in a Continuous Setting and a Regression Artifact in Numerical Cognition Research.2014In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, no 4, p. e95949-e95949Article in journal (Refereed)
    Abstract [en]

    In this paper we review, and elaborate on, the literature on a regression artifact related to Lord's paradox in a continuous setting. Specifically, the question is whether a continuous property of individuals predicts improvement from training between a pretest and a posttest. If the pretest score is included as a covariate, regression to the mean will lead to biased results if two critical conditions are satisfied: (1) the property is correlated with pretest scores and (2) pretest scores include random errors. We discuss how these conditions apply to the analysis in a published experimental study, the authors of which concluded that linearity of children's estimations of numerical magnitudes predicts arithmetic learning from a training program. However, the two critical conditions were clearly met in that study. In a reanalysis we find that the bias in the method can fully account for the effect found in the original study. In other words, data are consistent with the null hypothesis that numerical magnitude estimations are unrelated to arithmetic learning.

  • 46.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Helenius, Ola
    Univ Gothenburg, Natl Ctr Math Educ, Gothenburg, Sweden..
    Ryve, Andreas
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Ostfold Univ Coll, Fac Educ, Halden, Norway..
    Using TIMSS items to evaluate the effectiveness of different instructional practices2019In: Instructional science, ISSN 0020-4277, E-ISSN 1573-1952, Vol. 47, no 1, p. 1-18Article in journal (Refereed)
    Abstract [en]

    Can instructional quality be measured using TIMSS items on how often certain instructional practices are used in the mathematics classroom? We focused on three instructional practices that have been the topics of longstanding debates in the educational literature: memorizing formulas, listening to the teacher, and relating mathematics to daily life. In a multi-level multiple regression analysis, we examined how class-level responses to these items predicted mathematics achievement. In Sweden, across four waves of TIMSS, relating to daily life was a negative predictor of achievement, whereas memorizing formulas and listening to the teacher were positive predictors. This was also the typical pattern of results across all countries participating in two waves of the international TIMSS. Our findings are in line with certain positions on the abovementioned debates. Although conclusions are limited by the correlational nature of the data, we argue that TIMSS is a promising tool for evaluating the effectiveness of different instructional practices. We also suggest several improvements.

  • 47.
    Eriksson, Kimmo
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Häggström, Olle
    Instability of matchings in decentralized markets with various preference structures2008In: International Journal of Game Theory, ISSN 0020-7276, E-ISSN 1432-1270, Vol. 36, no 3/4, p. 409-420Article in journal (Refereed)
    Abstract [en]

    In any two-sided matching market, a stable matching can be found by a central agency using the deferred acceptance procedure of Gale and Shapley. But if the market is decentralized and information is incomplete then stability of the ensuing matching is not to be expected. Despite the prevalence of such matching situations, and the importance of stability, little theory exists concerning instability. We discuss various measures of instability and analyze how they interact with the structure of the underlying preferences. Our main result is that even the outcome of decentralized matching with incomplete information can be expected to be "almost stable" under reasonable assumptions.

  • 48.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Stockholm, Sweden.
    Jansson, Fredrik
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Stockholm University, Stockholm, Sweden; SIMSEG, Institute for Analytical Sociology, Linköping University, Sweden.
    Procedural priming of a numerical cognitive illusion2016In: Judgment and decision making, ISSN 1930-2975, E-ISSN 1930-2975, Vol. 11, no 3, p. 205-212Article in journal (Refereed)
    Abstract [en]

    A strategy activated in one task may be transferred to subsequent tasks and prevent activation of other strategies that would otherwise come to mind, a mechanism referred to as procedural priming. In a novel application of procedural priming we show that it can make or break cognitive illusions. Our test case is the 1/k illusion, which is based on the same unwarranted mathematical shortcut as the MPG illusion and the time-saving bias. The task is to estimate distances between values of fractions on the form 1/k. Most people given this task intuitively base their estimates on the distances between the denominators (i.e., the reciprocals of the fractions), which may yield very poor estimations of the true distances between the fractions. As expected, the tendency to fall for this illusion is related to cognitive style (Study 1). In order to apply procedural priming we constructed versions of the task in which the illusion is weak, in the sense that most people do not fall for it anymore. We then gave participants both “strong illusion” and “weak illusion” versions of the task (Studies 2 and 3). Participants who first did the task in the weak illusion version would often persist with the correct strategy even in the strong illusion version, thus breaking the otherwise strong illusion in the latter task. Conversely, participants who took the strong illusion version first would then often fall for the illusion even in the weak illusion version, thus strengthening the otherwise weak illusion in the latter task.

  • 49.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Jansson, Fredrik
    Mälardalen University, School of Education, Culture and Communication.
    Sjöstrand, Jonas
    KTH.
    Bentley's conjecture on popularity toplist turnover under random copying2010In: The Ramanujan journal, ISSN 1382-4090, E-ISSN 1572-9303, Vol. 23, no 1, p. 371-396Article in journal (Refereed)
    Abstract [en]

    Bentley et al. studied the turnover rate in popularity toplists in a 'random copying' model of cultural evolution. Based on simulations of a model with population size N, list length ℓ and invention rate μ, they conjectured a remarkably simple formula for the turnover rate: ℓ √μ. Here we study an overlapping generations version of the random copying model, which can be interpreted as a random walk on the integer partitions of the population size. In this model we show that the conjectured formula, after a slight correction, holds asymptotically.

  • 50.
    Eriksson, Kimmo
    et al.
    Mälardalen University, School of Education, Culture and Communication.
    Jansson, Fredrik
    Mälardalen University, School of Education, Culture and Communication.
    Vetander, Thomas
    Mälardalen University, School of Education, Culture and Communication.
    The assignment game with negative externalities and bounded rationality2011In: International Game Theory Review, ISSN 0219-1989, Vol. 13, no 4, p. 443-459Article in journal (Refereed)
    Abstract [en]

    We introduce negative externalities in the form of ill will among the players of the classic two-sided assignment game of Shapley and Shubik, by letting each player's utility be negatively correlated with the payoff of all the players in his group. The new game is very complex, but under a certain assumption of bounded rationality we derive a straightforward notion of stable outcomes as certain conjectural equilibria. We prove that several well-known properties of the set of stable outcomes in the assignment game carry over to this new game. © 2011 World Scientific Publishing Company.

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