A5017534073- Opinion Dynamics and Social Influence
- Evolutionary Game Theory and Cooperation
- Complex Network Analysis Techniques
- Experimental Behavioral Economics Studies
- Social Media and Politics
- Social Capital and Networks
- Game Theory and Applications
- Social and Cultural Dynamics
- Misinformation and Its Impacts
- Economic Theory and Institutions
- Business Strategy and Innovation
- Cultural Differences and Values
- Social and Intergroup Psychology
- Data-Driven Disease Surveillance
- Culture, Economy, and Development Studies
- Complex Systems and Time Series Analysis
- Human Mobility and Location-Based Analysis
- Complex Systems and Decision Making
- Innovation Diffusion and Forecasting
- Computational and Text Analysis Methods
- Evolutionary Psychology and Human Behavior
- Hate Speech and Cyberbullying Detection
- Spam and Phishing Detection
- Language and cultural evolution
- Contemporary Sociological Theory and Practice
Cornell University
2015-2024
Ross School
2018
Northwestern University
2017
Ithaca College
2013
University of Groningen
2002-2011
Tohoku University
2002
Interuniversity Center for Social Science Theory and Methodology
2002
Brandeis University
1987-1996
United States Army Medical Research Institute of Infectious Diseases
1985
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A key challenge for automatic hate-speech detection on social media is the separation of hate speech from other instances offensive language. Lexical methods tend to have low precision because they classify all messages containing particular terms as and previous work using supervised learning has failed distinguish between two categories. We used a crowd-sourced lexicon collect tweets keywords. use crowd-sourcing label sample these into three categories: those speech, only language, with...
The strength of weak ties is that they tend to be long—they connect socially distant locations, allowing information diffuse rapidly. authors test whether this "strength ties" generalizes from simple complex contagions. Complex contagions require social affirmation multiple sources. Examples include the spread high‐risk movements, avant garde fashions, and unproven technologies. Results show as adoption thresholds increase, long can impede diffusion. depend primarily on width bridges across...
▪ Abstract Sociologists often model social processes as interactions among variables. We review an alternative approach that models life adaptive agents who influence one another in response to the they receive. These agent-based (ABMs) show how simple and predictable local can generate familiar but enigmatic global patterns, such diffusion of information, emergence norms, coordination conventions, or participation collective action. Emergent patterns also appear unexpectedly then just...
We identified individual-level diurnal and seasonal mood rhythms in cultures across the globe, using data from millions of public Twitter messages. found that individuals awaken a good deteriorates as day progresses--which is consistent with effects sleep circadian rhythm--and change baseline positive affect varies daylength. People are happier on weekends, but morning peak delayed by 2 hours, which suggests people later weekends.
Preface Acknowledgements 1. The critical mass and the problem of collective action 2. Building blocks: goods, groups processes 3. paradox group size 4. dynamics production functions 5. Social networks: density, centralization cliques 6. Selectivity in social networks 7. Reach selectivity as strategies recruitment 8. Unfinished business References Name index Subject index.
The faddishness of the business community is often noted and lamented but not well understood by standard models innovation diffusion. We combine arguments about organizational cognition institutional mimicry to develop a model adaptive emulation, where firms respond perceived failure imitating their most successful peers. Computational experiments show that this process generates empirically plausible cascades adoption, even if innovations are entirely worthless. Faddish cycles robust...
The Nash equilibrium, the main solution concept in analytical game theory, cannot make precise predictions about outcome of repeated mixed-motive games. Nor can it tell us much dynamics by which a population players moves from one equilibrium to another. These limitations, along with concerns cognitive demands forward-looking rationality, have motivated efforts explore backward-looking alternatives theory. Most effort has been invested evolutionary models dynamics. We shift attention...
Granovetter's threshold model of collective action shows how each new participant triggers others until the chain reaction reaches a gap in distribution thresholds. Hence outcomes depend on network social ties that channel reactions. However, structural analysis is encumbered by assumption thresholds derive from changing marginal returns investments public goods. A learning-theoretic specification imposes less stringent assumptions about rationality actors and much better suited to analysis....
Social and economic exchanges often occur between strangers who cannot rely on past behavior or the prospect of future interactions to establish mutual trust. Game theorists formalize this problem as a one-shot prisoner's dilemma predict noncooperation. Recent studies, however, challenge conclusion. If game provides an option exit (or refuse play), strategies based projection (of player's intentions) detection intentions stranger) can confer cooperator's advantage. Yet previous research has...
Popular accounts of “lifestyle politics” and “culture wars” suggest that political ideological divisions extend also to leisure activities, consumption, aesthetic taste, personal morality. Drawing on a total 22,572 pairwise correlations from the General Social Survey (1972–2010), authors provide comprehensive empirical support for anecdotal accounts. Moreover, most differences in lifestyle cannot be explained by demographic covariates alone. The propose surprisingly simple solution puzzle...
The authors demonstrate the uses of agent‐based computational models in an application to a social enigma they call “emperor’s dilemma,” based on Hans Christian Andersen fable. In this model, agents must decide whether comply with and enforce norm that is supported by few fanatics opposed vast majority. They find cascades self‐reinforcing support for highly unpopular cannot occur fully connected network. However, if agents’ horizons are limited immediate neighbors, norms can emerge locally...
Online interaction is now a regular part of daily life for demographically diverse population hundreds millions people worldwide. These interactions generate fine-grained time-stamped records human behavior and social at the level individual events, yet are global in scale, allowing researchers to address fundamental questions about identity, status, conflict, cooperation, collective action, diffusion, both by using observational data conducting vivo field experiments. This unprecedented...
Social media has been transforming political communication dynamics for over a decade. Here using nearly billion tweets, we analyse the change in Twitter's news landscape between 2016 and 2020 US presidential elections. Using bias fact-checking tools, measure volume of politically biased content number users propagating such information. We then identify influencers-users with greatest ability to spread Twitter network. observe that fraction fake extremely declined 2020. However, results...
Science is among humanity’s greatest achievements, yet scientific censorship rarely studied empirically. We explore the social, psychological, and institutional causes consequences of (defined as actions aimed at obstructing particular ideas from reaching an audience for reasons other than low quality). Popular narratives suggest that driven by authoritarian officials with dark motives, such dogmatism intolerance. Our analysis suggests often scientists, who are primarily motivated...
The Oliver-Marwell theory of critical mass is a prominent solution to the 'free-rider problem that plagues collective action in large groups. I reformulate as stochastic learning model which cooperative responses are shaped by social sanctions and cues generated others. This relaxes four assumptions original formulation: actors rational, decisions isolated events, outcomes deterministic, public goods have pure jointness supply profit. Computer simulations then show how adaptive become...
The Prisoner's Dilemma formalizes the social trap that arises when individually rational choices aggregate with mutually undesirable consequences. game-theoretic solution centers on opportunity for tacit collusion in repeated play. However, not all actors grasp strategic implications of future interaction. Accordingly, this study reformulates game as a stochastic learning model which behavior interdependent is constinually shaped by sanctions and cues generated their Computer simulations...
Following Homans, exchange theorists have modeled informal social control as an of peer approval for compliance with group obligations. The model predicts higher in cohesive networks strong ties. However, previous specifications failed to incorporate bilateral approval. Computer simulations using a Bush‐Mosteller stochastic learning show that exchanges evolve more readily than multilateral, causing flow into the maintenance interpersonal relationships at expense obligations, structural form...
Prevailing theory assumes that people enforce norms in order to pressure others act ways they approve. Yet there are numerous examples of “unpopular norms” which compel each other do things privately disapprove. While peer sanctioning suggests a ready explanation for why conform unpopular norms, it is harder understand would norm oppose. The authors argue show have complied out genuine conviction and not because social pressure. They use laboratory experiments demonstrate this “false...
Building on Granovetter's theory of the “strength weak ties,” research “small-world” networks suggests that bridges between clusters in a social network (long-range ties) promote cultural diffusion, homogeneity, and integration. We show this macro-level implication structure depends hidden micro-level assumptions. Using computational model similar to earlier studies, we find ties facilitate convergence under assumptions assimilation attraction others. However, these also have negative...
Why do people help strangers when there is a low probability that will be directly reciprocated or socially rewarded? A possible explanation these acts are contagious: those who receive observe from stranger become more likely to others. We test two mechanisms for the social contagion of generosity among strangers: generalized reciprocity (a recipient pay it forward) and third-party influence (an observer generous behavior emulate it). use an online experiment with randomized trials...