How Do People Become W.E.I.R.D.? Migration Reveals the Cultural Transmission Mechanisms Underlying Variation in Psychological Processes

Cultural psychologists have shown that people from Western, Educated, Industrialised, Rich, Democratic (WEIRD) countries often exhibit different psychological processing to people from less-WEIRD countries. The former exhibit more individualistic and less collectivistic social orientation, and more analytic and less holistic cognition, than non-Westerners. Yet the mechanisms responsible for maintaining this cultural variation are unclear. Immigration is an ideal ‘natural experiment’ for uncovering such mechanisms. We used a battery of psychological measures previously shown to vary cross-culturally to compare the social orientation and cognitive style of 286 residents of East London from three cultural backgrounds: (i) 1^st-generation British Bangladeshi immigrants; (ii) 2^nd-generation British Bangladeshis raised in the UK to Bangladeshi-raised parents; and (iii) non-migrants whose parents were born and raised in the UK. Model comparison revealed that individualism and dispositional attribution, typical of Western societies, are driven primarily by horizontal cultural transmission (e.g. via mass media), with parents and other family members having little or no effect, while collectivism, social closeness and situational attribution were driven by a mix of vertical/oblique cultural transmission (e.g. via family contact) and horizontal cultural transmission. These individual-level transmission dynamics can explain hitherto puzzling population-level phenomena, such as the partial acculturation of 2^nd-generation immigrants on measures such as collectivism (due to the mix of vertical and horizontal cultural transmission), or the observation in several countries of increasing individualism (which is transmitted horizontally and therefore rapidly) despite little corresponding change in collectivism (which is transmitted partly vertically and therefore more slowly). Further consideration of cultural transmission mechanisms, in conjunction with the study of migrant communities and model comparison statistics, can shed light on the persistence of, and changes in, culturally-variable psychological processes.     

Mode and tempo in the evolution of socio-political organization: reconciling 'Darwinian' and 'Spencerian' evolutionary approaches in anthropology

Traditional investigations of the evolution of human social and political institutions trace their ancestry back to nineteenth century social scientists such as Herbert Spencer, and have concentrated on the increase in socio-political complexity over time. More recent studies of cultural evolution have been explicitly informed by Darwinian evolutionary theory and focus on the transmission of cultural traits between individuals. These two approaches to investigating cultural change are often seen as incompatible. However, we argue that many of the defining features and assumptions of 'Spencerian' cultural evolutionary theory represent testable hypotheses that can and should be tackled within a broader 'Darwinian' framework. In this paper we apply phylogenetic comparative techniques to data from Austronesian-speaking societies of Island South-East Asia and the Pacific to test hypotheses about the mode and tempo of human socio-political evolution. We find support for three ideas often associated with Spencerian cultural evolutionary theory: (i) political organization has evolved through a regular sequence of forms, (ii) increases in hierarchical political complexity have been more common than decreases, and (iii) political organization has co-evolved with the wider presence of hereditary social stratification.     

Immigrants' Cultural Identities as Sources of Civic Engagement

Immigrant parents (first generation) and adolescents (second generation) from El Salvador and India (N = 80) took part in interviews on civic engagement. The immigrants were almost unanimous in regarding civic engagement as important. They also were engaged themselves, more so at the community than the political level. One third of immigrants were engaged in community activities that specifically had a cultural focus or occurred through cultural organizations, and the comparable number for political activities was 25%. Cultural motives (i.e., a cultural or immigrant sense of self) were twice as likely to be mentioned as sources of engagement rather than disengagement. Qualitative analyses of these cultural motives revealed seven engagement themes (e.g., cultural tradition of service) and three of disengagement (e.g., ethnic exclusion).     

Primate archaeology reveals cultural transmission in wild chimpanzees (Pan troglodytes verus)

Recovering evidence of past human activities enables us to recreate behaviour where direct observations are missing. Here, we apply archaeological methods to further investigate cultural transmission processes in percussive tool use among neighbouring chimpanzee communities in the Taï National Park, Côte d''Ivoire, West Africa. Differences in the selection of nut-cracking tools between neighbouring groups are maintained over time, despite frequent female transfer, which leads to persistent cultural diversity between chimpanzee groups. Through the recovery of used tools in the suggested natal territory of immigrants, we have been able to reconstruct the tool material selection of females prior to migration. In combination with direct observations of tool selection of local residents and immigrants after migration, we uncovered temporal changes in tool selection for immigrating females. After controlling for ecological differences between territories of immigrants and residents our data suggest that immigrants abandoned their previous tool preference and adopted the pattern of their new community, despite previous personal proficiency of the same foraging task. Our study adds to the growing body of knowledge on the importance of conformist tendencies in animals.     

Immigration and the cost of ethnic subordination: the case of Israeli society

This study focuses on earnings disadvantages experienced by three ethnic groups of Jewish immigrants in Israel. Data were obtained from the 2011 Income Survey gathered by the Israel Central Bureau of Statistics. The findings reveal that when compared to Israeli-born, all ethnic groups are disadvantaged in earnings attainment in the first generation. The earnings disadvantages of immigrants as compared to Israeli-born decrease with the passage of time and become negligible in the second generation. To disentangle the impact on earnings penalty of ethnic origin from that of immigrant status, a procedure for decomposing mean differences between groups is introduced. The analysis reveals that earnings disadvantage among Ashkenazim and Soviet immigrants can be attributed to immigrant status but not to ethnicity. By contrast, earnings penalties among Sephardim immigrants can be attributed to both ethnicity and immigrant status. The implications of the long-lasting effect of ethnicity versus the short-term effect of immigrant status are discussed.     

Schooling Immigrants in France in the 1990s: Success or Failure of the Republican Model of Integration?

The perception and treatment of immigrants in French society have been strongly influenced by an ideology of integration known as the Republican model, a model that relies on state institutions and particularly on schools for its transmission. Analysis of the schooling of immigrants in the 1990s reveals that the enforcement of this model is still producing the desired manifestations of cultural assimilation, but that it has become much less effective in promoting the social and economic integration of immigrant groups. As a result, competing alternative models, especially neoliberal ones, might progressively play a central role.     

The dynamics of culture lost and conserved: demic migration as a force in new diaspora communities

Migration is a major feature of past and especially today's globalized cultures, and understanding how migration shapes cultural groups is key to the empirical applications of cultural transmission theory. Developed here is a migration–assimilation model describing the population-level dynamics of diaspora culture. Using ethnographic data collected from 2009 to 2010 in the Kingdom of Tonga and a Tongan diaspora community, key parameters of the model were estimated and the fitted model simulated to describe diaspora cultural dynamics in the Tongan case. The relative contribution of recent migrants to the population-level expression of several cultural traits is highlighted in the simulation. Results show that the dependence on the Tongan homeland as a source of conservative culture through migration is variable and trait specific. For traits with higher assimilation rates, the contribution of recent Tongan migrants is substantial, while for other traits with lower assimilation rates, the influence of Tongan migrants is muted. Preliminary hypotheses to explain the trait-specific assimilation rates are discussed.     

Macro-evolutionary studies of cultural diversity: a review of empirical studies of cultural transmission and cultural adaptation

A growing body of theoretical and empirical research has examined cultural transmission and adaptive cultural behaviour at the individual, within-group level. However, relatively few studies have tried to examine proximate transmission or test ultimate adaptive hypotheses about behavioural or cultural diversity at a between-societies macro-level. In both the history of anthropology and in present-day work, a common approach to examining adaptive behaviour at the macro-level has been through correlating various cultural traits with features of ecology. We discuss some difficulties with simple ecological associations, and then review cultural phylogenetic studies that have attempted to go beyond correlations to understand the underlying cultural evolutionary processes. We conclude with an example of a phylogenetically controlled approach to understanding proximate transmission pathways in Austronesian cultural diversity.     

The apple,the tree,and a space to grow in

The idea for the study presented in Spanish Legacies: the coming of age of the second generation was sparked by the series of unrests from immigrant youths in a number of cities across Europe. The discontent expressed by the young generation of immigrants presented a sharp indicator of how little is known about young people of foreign origin growing up as immigrant residents in Europe, despite their significant number (10 per cent in France, 13 per cent in Spain and 15 per cent in Ireland by 2010). The success or failure of immigrants’ integrational processes, considering cultural factors and language barriers as challenges experienced by immigrants, can have major political and social impact on the regions where they reside. It is these challenges that are investigated in depth, in this book.     

Scars for war: evaluating alternative signaling explanations for cross-cultural variance in ritual costs

While males in many societies endure traumatic and painful rites, in other societies male rites are mild or completely absent. To explain these cross-cultural differences, we use data collected from the Human Relations Area Files electronic databases (eHRAF) to test two sets of hypotheses derived from signaling theory. If costly male rites serve to signal mate quality, they would be expected to correlate with the intensity of mating competition. If they serve to signal group commitments, they would be expected to be associated with the importance of overcoming problems of collective action. Our results support the latter set of hypotheses: males in societies that engage in warfare endure the costliest rites. Moreover, we show that whether wars are fought within cultural groups or against other cultural groups is an important determinant of whether or not male rites result in permanent visible marks, such as ritual scars. We argue that costly male rites signal commitment and promote solidarity among males who must organize for warfare.     

Social integration and identity of immigrants from western countries,the FSU and Ethiopia in Israel

This study of immigrants’ integration in Israel centers on one major subjective parameter, namely the immigrant's identity. To explain it we explore a series of possible factors: demographic variables, economic status, and human and social capital characteristics. Three recent immigrant groups are examined: from Western countries, from the former Soviet Union (FSU), and from Ethiopia. These immigrants came to Israel during the last two decades from different societies, following different immigration circumstances and various motives.

The findings, based on the 2007 Ruppin survey data, point to the significant impact of the identity as perceived by veteran Israelis on the immigrants’ self-identity for the three groups under study. Also, different variables affect each of the immigrant groups. FSU immigrants behaved according to most of our hypotheses, whereas Western and Ethiopian immigrants did not. Findings are discussed in light of the debate on measuring and defining immigrants’ identity.     

Craniometric data support a mosaic model of demic and cultural Neolithic diffusion to outlying regions of Europe

The extent to which the transition to agriculture in Europe was the result of biological (demic) diffusion from the Near East or the adoption of farming practices by indigenous hunter-gatherers is subject to continuing debate. Thus far, archaeological study and the analysis of modern and ancient European DNA have yielded inconclusive results regarding these hypotheses. Here we test these ideas using an extensive craniometric dataset representing 30 hunter-gatherer and farming populations. Pairwise population craniometric distance was compared with temporally controlled geographical models representing evolutionary hypotheses of biological and cultural transmission. The results show that, following the physical dispersal of Near Eastern/Anatolian farmers into central Europe, two biological lineages were established with limited gene flow between them. Farming communities spread across Europe, while hunter-gatherer communities located in outlying geographical regions adopted some cultural elements from the farmers. Therefore, the transition to farming in Europe did not involve the complete replacement of indigenous hunter-gatherer populations despite significant gene flow from the Southwest Asia. This study suggests that a mosaic process of dispersal of farmers and their ideas was operating in outlying regions of Europe, thereby reconciling previously conflicting results obtained from genetic and archaeological studies.     

Segmented assimilation and socio-economic integration of Chinese immigrant children in the USA

Research on the new second generation has paid much attention to testing one of the hypotheses posed by segmented assimilation theory – downward assimilation into America's underclass – and has neglected to examine other possible outcomes. In this paper, I address a much understudied pathway – assimilation by way of the ethnic community – based on a case study of Chinese immigrant children in the USA. I show that the children of Chinese immigrants have made inroads into mainstream America through educational achievement, not only because of the strong value their parents put on education but also because resources generated in the ethnic community help actualize that value. The Chinese American experience suggests that, in order to advance to the rank of middle-class Americans, immigrant parents have chosen the ethnic way to facilitate children's social mobility and achieved success. Paradoxically, ‘assimilated’ children have also relied on ethnicity for empowerment to fight negative stereotyping of the racialized other.     

Intergenerational persistence of health: Do immigrants get healthier as they remain in the U.S. for more generations?

It is well known that a substantial part of income and education is passed on from parents to children, generating substantial persistence in socioeconomic status across generations. In this paper, we examine whether another form of human capital, health, is also largely transmitted from generation to generation. Using data from the NLSY, we first present new evidence on intergenerational transmission of health outcomes in the U.S., including weight, height, the body mass index (BMI), asthma and depression for both natives and immigrants. We show that between 50% and 70% of the mothers’ health status persists in both native and immigrant children, and that, on average, immigrants experience higher persistence than natives in BMI. We also find that the longer immigrants remain in the U.S., the less intergenerational persistence there is and the more immigrants look like native children. Unfortunately, the more generations immigrant families remain in the U.S., the more children of immigrants resemble natives’ higher BMI.     

Teaching and the Life History of Cultural Transmission in Fijian Villages

Much existing literature in anthropology suggests that teaching is rare in non-Western societies, and that cultural transmission is mostly vertical (parent-to-offspring). However, applications of evolutionary theory to humans predict both teaching and non-vertical transmission of culturally learned skills, behaviors, and knowledge should be common cross-culturally. Here, we review this body of theory to derive predictions about when teaching and non-vertical transmission should be adaptive, and thus more likely to be observed empirically. Using three interviews conducted with rural Fijian populations, we find that parents are more likely to teach than are other kin types, high-skill and highly valued domains are more likely to be taught, and oblique transmission is associated with high-skill domains, which are learned later in life. Finally, we conclude that the apparent conflict between theory and empirical evidence is due to a mismatch of theoretical hypotheses and empirical claims across disciplines, and we reconcile theory with the existing literature in light of our results.     

On the relationship between interindividual cultural transmission and population-level cultural diversity: a case study of weaving in Iranian tribal populations

It is often assumed that parent-to-child cultural transmission leads to similarities and differences among groups evolving through descent with modification (“phylogenesis”). Similarly, cultural transmission between peers, and between adults and children who are not their offspring, is widely believed to result in groups exchanging cultural traits (“ethnogenesis”). However, neither of these assumptions has been examined empirically. Here, we test them using ethnographic data on craft learning in Iranian tribal populations and the cladistic method of phylogenetic analysis. We find that parent-to-child transmission dominates learning during childhood, but the other two forms of interindividual transmission become more important in later periods. The latter do not, however, appear to have resulted in extensive exchange of cultural traits among tribes. Instead we find that most of the variation among the tribes' craft assemblages can be explained by descent with modification. This can be accounted for by the fact that weavers usually only share their knowledge with members of their own tribe and are prevented from interacting with women from other groups by social norms. These findings demonstrate that the relationship between processes of cultural evolution at the level of the individual and processes of cultural evolution at the level of the group is more complex than is usually acknowledged, and highlight the need for more integrated studies of the processes operating at both scales.     

Cultural transmission in the laboratory: agent interaction improves the intergenerational transfer of information

Cumulative cultural evolution requires that information is faithfully transmitted from generation to generation. The present study examines the role of agent interaction as a social learning mechanism through which information is transmitted across multiple generations. The performance of two types of linear transmission chains was compared: noninteractive (agents in adjacent chain positions were not permitted to interact) and interactive (adjacent agents freely interacted with one another). In both conditions, information (details of a narrative text) was lost as it was passed along the transmission chain. However, interactive transmission chains promoted more accurate recall of information than noninteractive chains. A content analysis revealed that most listeners actively participated in the information transfer process by seeking clarification and providing backchannel feedback to the narrator. Furthermore, the extent to which listeners engaged with the narrator was associated with narrator recall accuracy. Our results indicate that bidirectional agent interaction is an important consideration for studies of cultural transmission and cumulative cultural evolution.     

Untangling cultural inheritance: language diversity and long-house architecture on the Pacific northwest coast

Many recent studies of cultural inheritance have focused on small-scale craft traditions practised by single individuals, which do not require coordinated participation by larger social collectives. In this paper, we address this gap in the cultural transmission literature by investigating diversity in the vernacular architecture of the Pacific northwest coast, where communities of hunter-fisher-gatherers constructed immense wooden long-houses at their main winter villages. Quantitative analyses of long-house styles along the coastline draw on a range of models and methods from the biological sciences and are employed to test hypotheses relating to basic patterns of macro-scale cultural diversification, and the degree to which the transmission of housing traits has been constrained by the region's numerous linguistic boundaries. The results indicate relatively strong branching patterns of cultural inheritance and also close associations between regional language history and housing styles, pointing to the potentially crucial role played by language boundaries in structuring large-scale patterns of cultural diversification, especially in relation to 'collective' cultural traditions like housing that require substantial inputs of coordinated labour.     

The effect of perceived cultural and material threats on ethnic preferences in immigration attitudes

This paper shows that cultural and material threats exist side by side, serving different psychological functions, and that they manifest in differential attitudes towards immigrants from different ethnic or racial origins. While culturally threatened individuals prefer immigrants akin to themselves, as opposed to those from different races and cultures, the materially threatened prefer immigrants who are different from themselves who can be expected not to compete for the same resources. We test our hypotheses using multilevel structural equation modelling, based on data from twenty countries in the 2002 wave of the European Social Survey. The disaggregation of these two types of perceived threat reveals responsiveness to the race of immigrants that is otherwise masked by pooling the two threat dimensions.