Small World
The political economy of linguistic cleavages
Klaus Desmet, Ignacio Ortuño-Ortín, Romain Wacziarg
Journal of Development Economics, forthcoming
Abstract:
This paper uses a linguistic tree, describing the genealogical relationship between all 6,912 world languages, to compute measures of diversity at different levels of linguistic aggregation. By doing so, we let the data inform us on which linguistic cleavages are most relevant for a range of political economy outcomes, rather than making ad hoc choices. We find that deep cleavages, originating thousands of years ago, lead to better predictors of civil conflict and redistribution. The opposite pattern emerges when it comes to the impact of linguistic diversity on growth and public goods provision, where finer distinctions between languages matter.
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Executive Networks and Firm Policies: Evidence from the Random Assignment of MBA Peers
Kelly Shue
Harvard Working Paper, February 2011
Abstract:
Using the historical random assignment of MBA students to sections at Harvard Business School, I show that executive peer networks are important determinants of managerial decision-making and firm policies. Within a class, executive compensation and acquisitions strategy are significantly more similar among graduates from the same section than among graduates from different sections. Both executive compensation and acquisitions propensities have elasticities of 10-20% with respect to the mean characteristics of section peers. I demonstrate the important role of ongoing social interactions by showing that peer effects are more than twice as strong in the year immediately following staggered alumni reunions. I further show that peer effects in compensation are not driven by similarities in underlying managerial productivity using a test of "pay for friend's luck": pay responds to lucky industry-level shocks to the compensation of peers in distant industries. Finally, I show that social interactions increased the between-section variance in outcomes by 20-40%, demonstrating that peer effects can significantly contribute to the large variation in outcomes across peer groups.
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Synchronicity, instant messaging, and performance among financial traders
Serguei Saavedra, Kathleen Hagerty & Brian Uzzi
Proceedings of the National Academy of Sciences, forthcoming
Abstract:
Successful animal systems often manage risk through synchronous behavior that spontaneously arises without leadership. In critical human systems facing risk, such as financial markets or military operations, our understanding of the benefits associated with synchronicity is nascent but promising. Building on previous work illuminating commonalities between ecological and human systems, we compare the activity patterns of individual financial traders with the simultaneous activity of other traders - an individual and spontaneous characteristic we call synchronous trading. Additionally, we examine the association of synchronous trading with individual performance and communication patterns. Analyzing empirical data on day traders' second-to-second trading and instant messaging, we find that the higher the traders' synchronous trading is, the less likely they are to lose money at the end of the day. We also find that the daily instant messaging patterns of traders are closely associated with their level of synchronous trading. This result suggests that synchronicity and vanguard technology may help traders cope with risky decisions in complex systems and may furnish unique prospects for achieving collective and individual goals.
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Doran French et al.
Child Development, forthcoming
Abstract:
Quartets of Chinese (n = 125) and Canadian (n = 133) 7-year-old children were observed as they played with a single attractive toy. Chinese children exhibited more assertive and general rule bids, engaged in more spontaneous giving, and reacted more positively to assertions of others whereas Canadian children more frequently referred to norms of sharing. Evidence of cultural scripts for dealing with potential conflict, that is, sharing for Canadian children and hierarchical organization for Chinese children, emerged. Passive and reticent behaviors in Chinese children and assertion and object control by Canadian children were associated with group acceptance, results suggesting the meaning of these patterns of social behavior may differ in these two countries.
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The Southern Route "Out of Africa": Evidence for an Early Expansion of Modern Humans into Arabia
Simon Armitage et al.
Science, 28 January 2011, Pages 453-456
Abstract:
The timing of the dispersal of anatomically modern humans (AMH) out of Africa is a fundamental question in human evolutionary studies. Existing data suggest a rapid coastal exodus via the Indian Ocean rim around 60,000 years ago. We present evidence from Jebel Faya, United Arab Emirates, demonstrating human presence in eastern Arabia during the last interglacial. The tool kit found at Jebel Faya has affinities to the late Middle Stone Age in northeast Africa, indicating that technological innovation was not necessary to facilitate migration into Arabia. Instead, we propose that low eustatic sea level and increased rainfall during the transition between marine isotope stages 6 and 5 allowed humans to populate Arabia. This evidence implies that AMH may have been present in South Asia before the Toba eruption.
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Hunter-gatherer genomic diversity suggests a southern African origin for modern humans
Brenna Henn et al.
Proceedings of the National Academy of Sciences, forthcoming
Abstract:
Africa is inferred to be the continent of origin for all modern human populations, but the details of human prehistory and evolution in Africa remain largely obscure owing to the complex histories of hundreds of distinct populations. We present data for more than 580,000 SNPs for several hunter-gatherer populations: the Hadza and Sandawe of Tanzania, and the ≠Khomani Bushmen of South Africa, including speakers of the nearly extinct N|u language. We find that African hunter-gatherer populations today remain highly differentiated, encompassing major components of variation that are not found in other African populations. Hunter-gatherer populations also tend to have the lowest levels of genome-wide linkage disequilibrium among 27 African populations. We analyzed geographic patterns of linkage disequilibrium and population differentiation, as measured by FST, in Africa. The observed patterns are consistent with an origin of modern humans in southern Africa rather than eastern Africa, as is generally assumed. Additionally, genetic variation in African hunter-gatherer populations has been significantly affected by interaction with farmers and herders over the past 5,000 y, through both severe population bottlenecks and sex-biased migration. However, African hunter-gatherer populations continue to maintain the highest levels of genetic diversity in the world.
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Cecilia Sin-Sze Cheung & Eva Pomerantz
Child Development, forthcoming
Abstract:
This research examined parents' involvement in children's learning in the United States and China. Beginning in seventh grade, 825 American and Chinese children (mean age = 12.74 years) reported on their parents' involvement in their learning as well as their parents' psychological control and autonomy support every 6 months until the end of 8th grade. Information on children's academic and emotional adjustment was obtained. American (vs. Chinese) parents' involvement was associated less with their control and more with their autonomy support. Despite these different associations, parents' heightened involvement predicted children's enhanced engagement and achievement similarly in the United States and China. However, it predicted enhanced perceptions of competence and positive emotional functioning more strongly in the United States than China.
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Dorothy Washburn, William Washburn & Petia Shipkova
Journal of Archaeological Science, forthcoming
Abstract:
We propose the existence of extensive trade and interaction among the peoples of the American Southwest and Mesoamerica. We base this inference on our detection of the widespread presence of theobromine, the biomarker for cacao, in 50 of 75 vessels used by Ancestral Puebloans (previously referred to as Anasazi) elites and non-elites from the Four Corners area and Hohokam elites of the Gila and Salt river valleys in the prehistoric American Southwest. We used a non-invasive, non-destructive aqueous sampling procedure that provides conservation advantages over the current methods that require crushing and boiling sherds or removing residues from vessel surfaces. Analysis of these samples by sensitive LC-MS instrumentation capable of detecting nanogram quantities of material revealed theobromine in non-local vessel forms found in elite burials in great house and platform mound sites as well as in local vessel forms used by non-elites living in small unit-pueblos. After elimination of plants native to the Southwest as the source of theobromine, we conclude that either Theobroma cacao or Theobroma Bicolor was imported from its homeland in the Mesoamerican tropical coastal lowlands. Our results are at odds with the current consensus that there was little systematic commerce between Mesoamerican and Southwestern polities. We suggest that cacao was exchanged for high quality turquoise such as that mined in the Cerrillos, New Mexico mining district. We conclude that, far from being isolated developmentally, this trade integrally tied populations in the American Southwest to the socio-political and economic activities of Mesoamerican states.
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John Mayer, Stephanie Lin & Maria Korogodsky
Review of General Psychology, March 2011, Pages 65-76
Abstract:
We examined whether personality judgments were present in texts of the diverse religious and philosophical traditions that emerged during the Great Transformation, an era spanning roughly 1000 BCE to 200 BCE. Some psychologists have suggested that the tendency of humans to judge personality has evolved; if some ancient societies failed to record personality judgments, it would be evidence against such an evolutionary position. In addition, learning about the prevalence and specifics of ancient personality judgments can help psychologists better understand the prehistory of personality psychology. Eight cultural traditions were studied: two each from China (Confucianism, Taoism), Greece (Classical and Hellenistic philosophy), India (Buddhism, Hinduism), and the Middle East (Judaism, Zoroastrianism). We found evidence that personality judgments were an important aspect of all of these traditions. Not only did people judge one another, but they also offered instructions on how to judge others.
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An evolutionary process that assembles phenotypes through space rather than through time
Richard Shine, Gregory Brown & Benjamin Phillips
Proceedings of the National Academy of Sciences, forthcoming
Abstract:
In classical evolutionary theory, traits evolve because they facilitate organismal survival and/or reproduction. We discuss a different type of evolutionary mechanism that relies upon differential dispersal. Traits that enhance rates of dispersal inevitably accumulate at expanding range edges, and assortative mating between fast-dispersing individuals at the invasion front results in an evolutionary increase in dispersal rates in successive generations. This cumulative process (which we dub "spatial sorting") generates novel phenotypes that are adept at rapid dispersal, irrespective of how the underlying genes affect an organism's survival or its reproductive success. Although the concept is not original with us, its revolutionary implications for evolutionary theory have been overlooked. A range of biological phenomena (e.g., acceleration of invasion fronts, insular flightlessness, preadaptation) may have evolved via spatial sorting as well as (or rather than) by natural selection, and this evolutionary mechanism warrants further study.
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Forced Coexistence and Economic Development: Evidence from Native American Reservations
Christian Dippel
University of Toronto Working Paper, December 2010
Abstract:
There are large differences in economic development across Native American reservations today. This paper asks whether these differences can be in part explained by the forced integration of historically autonomous sub-tribal bands in the 19th century. To measure forced integration, I combine anthropological data on intra-tribal political integration in pre-reservation times with historical information on the constituent bands of each reservation. Exploring variation in how politically integrated tribes were before reservations and variation in how politically integrated reservations were at the time of their formation, I find that forced integration lowers per capita incomes today by about 30 percent. To account for potential selection into forced integration, I exploit historical mining rushes as a source of exogenous variation in the government's incentive to combine bands onto reservations. The IV strategy confirms the baseline results. I also provide quantitative evidence on the channels through which forced integration affects incomes today.
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Culture, Cognition, and Collaborative Networks in Organizations
Sameer Srivastava & Mahzarin Banaji
American Sociological Review, forthcoming
Abstract:
This article examines the interplay of culture, cognition, and social networks in organizations with norms that emphasize cross-boundary collaboration. In such settings, social desirability concerns can induce a disparity between how people view themselves in conscious (i.e., deliberative) versus less conscious (i.e., automatic) cognition. These differences have implications for the resulting pattern of intra-organizational collaborative ties. Based on a laboratory study and field data from a biotechnology firm, we find that (1) people consciously report more positive views of themselves as collaborative actors than they appear to hold in less conscious cognition; (2) less conscious collaborative-independent self-views are associated with the choice to enlist organizationally distant colleagues in collaboration; and (3) these self-views are also associated with a person's likelihood of being successfully enlisted by organizationally distant colleagues (i.e., of supporting these colleagues in collaboration). By contrast, consciously reported collaborative-independent self-views are not associated with these choices. This study contributes to our understanding of how culture is internalized in individual cognition and how self-related cognition is linked to social structure through collaboration. It also demonstrates the limits of self-reports in settings with strong normative pressures and represents a novel integration of methods from cognitive psychology and network analysis.
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On the earliest evidence for habitual use of fire in Europe
Wil Roebroeks & Paola Villa
Proceedings of the National Academy of Sciences, forthcoming
Abstract:
The timing of the human control of fire is a hotly debated issue, with claims for regular fire use by early hominins in Africa at ∼1.6 million y ago. These claims are not uncontested, but most archaeologists would agree that the colonization of areas outside Africa, especially of regions such as Europe where temperatures at time dropped below freezing, was indeed tied to the use of fire. Our review of the European evidence suggests that early hominins moved into northern latitudes without the habitual use of fire. It was only much later, from ∼300,000 to 400,000 y ago onward, that fire became a significant part of the hominin technological repertoire. It is also from the second half of the Middle Pleistocene onward that we can observe spectacular cases of Neandertal pyrotechnological knowledge in the production of hafting materials. The increase in the number of sites with good evidence of fire throughout the Late Pleistocene shows that European Neandertals had fire management not unlike that documented for Upper Paleolithic groups.
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Classic Selective Sweeps Were Rare in Recent Human Evolution
Ryan Hernandez et al.
Science, February 2011, Pages 920-924
Abstract:
Efforts to identify the genetic basis of human adaptations from polymorphism data have sought footprints of "classic selective sweeps" (in which a beneficial mutation arises and rapidly fixes in the population).Yet it remains unknown whether this form of natural selection was common in our evolution. We examined the evidence for classic sweeps in resequencing data from 179 human genomes. As expected under a recurrent-sweep model, we found that diversity levels decrease near exons and conserved noncoding regions. In contrast to expectation, however, the trough in diversity around human-specific amino acid substitutions is no more pronounced than around synonymous substitutions. Moreover, relative to the genome background, amino acid and putative regulatory sites are not significantly enriched in alleles that are highly differentiated between populations. These findings indicate that classic sweeps were not a dominant mode of human adaptation over the past ~250,000 years.
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Representation of colour concepts in bilingual cognition: The case of Japanese blues
Panos Athanasopoulos et al.
Bilingualism: Language and Cognition, January 2011, Pages 9-17
Abstract:
Previous studies demonstrate that lexical coding of colour influences categorical perception of colour, such that participants are more likely to rate two colours to be more similar if they belong to the same linguistic category (Roberson et al., 2000, 2005). Recent work shows changes in Greek-English bilinguals' perception of within and cross-category stimulus pairs as a function of the availability of the relevant colour terms in semantic memory, and the amount of time spent in the L2-speaking country (Athanasopoulos, 2009). The present paper extends Athanasopoulos' (2009) investigation by looking at cognitive processing of colour in Japanese-English bilinguals. Like Greek, Japanese contrasts with English in that it has an additional monolexemic term for ‘light blue' (mizuiro). The aim of the paper is to examine to what degree linguistic and extralinguistic variables modulate Japanese-English bilinguals' sensitivity to the blue/light blue distinction. Results showed that those bilinguals who used English more frequently distinguished blue and light blue stimulus pairs less well than those who used Japanese more frequently. These results suggest that bilingual cognition may be dynamic and flexible, as the degree to which it resembles that of either monolingual norm is, in this case, fundamentally a matter of frequency of language use.
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Why Has the Number of International Non-Governmental Organizations Exploded since 1960?
Edward Turner
Cliodynamics, 2010
Abstract:
The rapid expansion of international non-governmental organizations (INGOs) numbers in the last half-century is usually explained to be a result of decolonization, globalization, and/or increase in the number of global issues. One additional hypothesis, which has not been discussed in the political science literature, is suggested by the demographic-structural theory. According to this hypothesis, the acceleration in INGO numbers was caused by the post-war baby boom and a crisis in the credential system. This study finds that cyclical increases in INGO numbers were preceded by expansions in the 30-39 cohort. Interestingly, the mean age of leaders across 12 international governmental institutions also oscillated, but with a lag (thus correlated with expansions of the 55-64 cohort). Thus evidence supports the idea that demographic-structural mechanisms contributed to the surge in INGO numbers during the last 50 years as a by-product of intraelite competition.
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Extreme right-wing vote and support for multiculturalism in Europe
Jessica Sprague-Jones
Ethnic and Racial Studies, April 2011, Pages 535-555
Abstract:
While Europe is unifying, it is also becoming more diverse, making multiculturalism one of the most hotly debated political issues in Western Europe. Minority citizens occupy an important place in the landscape of this challenging issue. Using the Eurobarometer 53 survey of European citizens, I look at the gap between Europeans who claim minority heritage and those who do not in support for multiculturalism in fifteen European Union member nations, taking into account percentage of extreme right-wing vote. This contextual factor has a persistent significant effect on the difference between minority and non-minority attitudes. High levels of support for extreme right-wing parties may have a polarizing effect, heightening awareness of personal heritage and making ethnic identity more salient in attitudes towards multiculturalism. This suggests an extension of group threat theory in which conceptions of what constitutes both a group and a threat can be created at the level of discourse.