In the management of the Covid 19 crisis, digital technologies were used in a major way. This article defends the hypothesis that these technologies took the form of a “tacit social experimentation”. This article justifies this concept in three levels. The first part uses this concept to qualify the form of biopolitics that was implemented to manage the crisis. Digital technologies were used to discipline the population and, literally speaking, as instruments of knowledge of the population. Uncertainty forced (...) experts to make preliminary observations and act to produce knowledge. Second, this article shows that the use of digital technologies during the crisis was experimental in a second sense. By promoting telemedicine within a more flexible legal framework, the authorities authorised an experimental use of telemedicine without knowledge or control of its side effects. Finally, the article defends the use of the concept of “tacit social experimentation” for ethical and political purposes. For indeed, understanding the experiments carried out during the crisis begs the question of the involvement of the participants and their democratic steering. (shrink)

When the terms ‘control’ and ‘experiment’ are used in reference to the methodological procedures of the social sciences, frequently the question is raised as to whether or not the investigator uses the terms in the same sense as the natural scientist. The purpose of this paper is to show that the social scientist has good reason to use them in the same sense and that in fact this usage is consistent with a long tradition of social research. (...) This will be shown by an investigation of some common assumptions in the social sciences, such as, the claim that the social sciences are younger than the natural sciences and that the former have depended upon the latter for methodological cues, that human behavior is ultimately inexplicable and unpredictable, and that the social scientist is unable to observe human behavior under controlled, experimental conditions except in trivial instances. Of course, not all social scientists make these assumptions but they occur in the literature and their significance is considerable when the scientific status of the social sciences is being discussed. (shrink)

In some of his more obscure works, Michel Foucault characterises homosexual culture as being connected with an interesting practice of friendship. Since homosexual relationships cannot be derived from existing norms, they are inherently underdetermined, and this means that homosexual culture provides a space for the creation of new types of relationship. Inspired by this practice of social experimentation, Foucault puts forward a concept of friendship based on the collaborative creation of new relationships in marginal spaces. I argue that (...) putting this concept of friendship into practice entails social activism in two ways: first, the creation of new relationships in marginal spaces constitutes a form of localised resistance to social normalisation, and second, because experimentation with relationships presents a challenge to the excessive normalisation of relationships on a societal scale. Friendship, for Foucault, is therefore a resource for both local resistance and large-scale social change. I also argue that Foucault's work on gay culture deserves more scholarly attention because it provides a supplement to his interpretation of the Enlightenment and forges a link between friendship and the aesthetics of existence. (shrink)

In this article, I argue that experimental ethics – like experimental economics – should also concern itself with field experiments. In particular, I defend two claims: a) that philosophers in normative ethics could considerably narrow down their disputes if they could agree on a wider range of socio-economic facts; and that b) the socio-economic facts that would be needed for this could only be generated by deliberate large-scale social experimentation. This essay normatively grounds my interest in special administration (...) zones. (shrink)

This is the first book to examine behavioral theories on social preference from institutional and philosophical perspectives using economic experiments. The experimental method in economics has challenged central behavioral assumptions based on rationality and selfishness, proposing empirical evidence that not only profit seeking but also social preferences matter in individuals' decision making. By performing distribution experiments in institutional contexts, the author extends assumptions about human behavior to understand actual social economy. The book also aims to enrich behavioral (...) theories of economics directed toward institutional evolution. The author scrutinizes how specific institutional conditions enhance or mute individuals' selfish incentives or their fairness ideals such as egalitarian, performance-based, labor-value radicalism or libertarianism. From experimental results and their analysis, implications for actual problems in social economy and institutional change are derived: why performance-based pay often fails to promote workers' productivity; why labor wages decline whereas shareholder's values increase after financialization; and whether socially responsible investment can be a social institution for corporate governance. The book is also addressed to philosophers of social sciences interested in how experimental methods can contribute to developing cognition of human behaviors and be extended to social theories. Referring to behavioral theorists in the history of economic thought, the author discusses the meanings of experiments in the methodology of social sciences. She also proposes new ways of interpreting experimental results by reviving historic social theories and applying them to actual social problems. (shrink)

In recent years, experimental economists have complemented earlier research by psychologists on equity theory, altruism, and related theories, by studying the anonymous allocation of dollar prizes by experimental subjects. This research has helped us understand the nature of attitudes towards fairness, reciprocity, and other "social preferences," and how these attitudes interact with self interest. The author critically reviews some of this evidence and the prevalent interpretations of this evidence to suggest some general lessons and ideas for where further research (...) would be useful. (shrink)

This new edition of Charles Fried's 'Medical Experimentation' includes a general introduction by Franklin Miller and the late Alan Wertheimer, a reprint of the 1974 text, an in-depth analysis by Harvard Law School scholars I. Glenn Cohen and D. James Greiner, and a new essay by Fried reflecting on the original text and how it applies to the contemporary landscape of medicine and medical experimentation.

This article surveys some of the philosophical issues raised by recent experimental work in economics on so-called social preferences. This work raises a number of fascinating methodological and interpretive issues that are of central importance both to economics and to social and political philosophy.

How does the Social Lab methodology support participatory research? This paper provides an evidence-based analysis of experiences of 19 implemented Social Labs applying experiential learning cycles on the question of how to induce Responsible Research and Innovation in the Horizon2020 research funding scheme of the European Commission and beyond. It looks at the potentials of Social Labs to allow participation in research and innovation addressing societal challenges and contrasts empirical results with the theoretical conceptualisation of a scientific (...) Social Lab methodology. It discusses drivers and barriers of engagement, and provides evidence for the impacts of experimental engagement on participation in the context of the labs, substantiated by concrete examples from some of these labs. (shrink)

Corporate social responsibility is widely established by companies that aim to contribute to society and minimize their negative impact on the environment. In CSR research, employees’ reactions to CSR have extensively been researched. Social identity theory is often used as a theoretical background to explain the relationship between CSR and employee-related outcomes, but until now, a sound empirical examination is lacking, and causality remains unclear. CSR can unfold its effect mainly because of three theoretically important aspects of CSR (...) initiatives, which increase identification, i.e., distinctiveness, prestige, and salience of the out-group. This study examines how far identification can explain the effect of CSR on employees. In an experimental vignette study, CSR was manipulated in three degrees to examine its effects on job satisfaction, organizational commitment, and organizational citizenship behavior. In the vignettes, information on distinctiveness, prestige, and salience of the out-group were presented. Regression analyses showed that CSR significantly predicted commitment and job satisfaction, but not OCB. We found mediation effects of CSR on commitment, job satisfaction, and OCB through identification, but the effect of CSR on identification explained only little variance which indicates additional underlying mechanisms. The applicability of social identity theory for explaining CSR is discussed. Moreover, we discuss further explaining mechanisms. (shrink)

The experimental revolution in the social sciences is one of the most significant methodological shifts undergone by the field since the ‘quantitative revolution’ in the nineteenth century. One of the often valued features of social science experimentation is precisely the fact that there are clear methodological rules regarding hypothesis testing that come from the methods of the natural sciences and from the methodology of RCTs in the biomedical sciences, and that allow for the adjudication among contentious causal (...) claims. We examine critically this claim and argue that some current understandings of the practices that surround social science experimentation overestimate the degree to which experiments can actually fulfil this role as “objective” adjudicators, by neglecting the importance of shared background knowledge or assumptions and of consensus regarding the validity of the constructs involved in an experiment. We take issue with the way the distinction between internal and external validity is often used to comment on the inferential import of experiments, used both among practitioners and among philosophers of science. We describe the ways in which the more common use of the internal/external distinction differs from Cook and Campbell’s original methodological project, in which construct validity and the four-fold validity typology were all important in assessing the inferential import of experiments. We argue that the current uses of the labels internal and external, as applied to experimental validity, help to encroach a simplistic view on the inferential import of experiments that, in turn, misrepresents their capacity to provide objective knowledge about the causal relations between variables. (shrink)

This article is an account of the dynamics of interaction across the social sciences and neurosciences. Against an arid rhetoric of ‘interdisciplinarity’, it calls for a more expansive imaginary of what experiment – as practice and ethos – might offer in this space. Arguing that opportunities for collaboration between social scientists and neuroscientists need to be taken seriously, the article situates itself against existing conceptualizations of these dynamics, grouping them under three rubrics: ‘critique’, ‘ebullience’ and ‘interaction’. Despite their (...) differences, each insists on a distinction between sociocultural and neurobiological knowledge, or does not show how a more entangled field might be realized. The article links this absence to the ‘regime of the inter-’, an ethic of interdisciplinarity that guides interaction between disciplines on the understanding of their pre-existing separateness. The argument of the paper is thus twofold: (1) that, contra the ‘regime of the inter-’, it is no longer practicable to maintain a hygienic separation between sociocultural webs and neurobiological architecture; (2) that the cognitive neuroscientific experiment, as a space of epistemological and ontological excess, offers an opportunity to researchers, from all disciplines, to explore and register this realization. (shrink)

The classical experimental methodology is ill-suited for the investigation of the behavioral and physiological correlates of natural social interactions. A new experimental approach combining a natural conversation between two persons with control conditions is proposed in this paper. Behavior, including gaze direction and speech, and physiology, including electrodermal activity, are recorded during a discussion between two participants through videoconferencing. Control for the social aspect of the interaction is provided by the use of an artificial agent and of videoed (...) conditions. A cover story provides spurious explanations for the purpose of the experiment and for the recordings, as well as a controlled and engaging topic of discussion. Preprocessing entails transforming raw measurements into boxcar and delta functions time series indicating when a certain behaviour or physiological event is present. The preliminary analysis presented here consists in finding statistically significant differences between experimental conditions in the temporal associations between behavioral and physiological time series. Significant results validate the experimental approach and further developments including more elaborate analysis and adaptation of the paradigm to functional MRI are discussed. (shrink)

We assert that audit quality can be improved to the extent that social norms for honesty and responsibility are activated in the auditor. To test this assertion, we use an experimental audit market setting found in the literature and manipulate factors expected to activate honesty and responsibility norms in the auditor. We find that auditor misreporting is reduced when the investor is another participant in the experiment rather than computer simulated, and thus, the interests of third-party investors are salient (...) to the auditor. We also find that auditor misreporting is reduced when the auditor is required to sign-off on the audit report, but only when the investor is another participant in the experiment. Consistent with our underlying theory, we find that pre-experimental measures of sensitivity to honesty and responsibility norms help explain the effects of our manipulated variables. Finally, we find that these measures of social norm sensitivity are associated with the moral judgment that auditor misreporting is unethical. Our study helps explain previous anomalous findings in the literature and answers the call in Blay et al. for empirical researchers to use social norm theory to develop stronger tests of moral reasoning in the market for auditing services. (shrink)

We assert that audit quality can be improved to the extent that social norms for honesty and responsibility are activated in the auditor. To test this assertion, we use an experimental audit market setting found in the literature and manipulate factors expected to activate honesty and responsibility norms in the auditor. We find that auditor misreporting is reduced when the investor is another participant in the experiment rather than computer simulated, and thus, the interests of third-party investors are salient (...) to the auditor. We also find that auditor misreporting is reduced when the auditor is required to sign-off on the audit report, but only when the investor is another participant in the experiment. Consistent with our underlying theory, we find that pre-experimental measures of sensitivity to honesty and responsibility norms help explain the effects of our manipulated variables. Finally, we find that these measures of social norm sensitivity are associated with the moral judgment that auditor misreporting is unethical. Our study helps explain previous anomalous findings in the literature and answers the call in Blay et al. (J Bus Ethics 2017. doi:10.1007/s10551-016-3286-4) for empirical researchers to use social norm theory to develop stronger tests of moral reasoning in the market for auditing services. (shrink)

Can you think of a meme that made you laugh or a political post that made you angry? These examples illustrate how social media use (SMU) impacts how people feel. Similarly, how people feel when they initiate SMU may impact the emotional effects of SMU. Someone feeling happy may feel more positively during SMU, whereas someone feeling sad may feel more negatively. Using an experimental design, we examined whether following SMU, those in a happy mood would experience increases in (...) positive affect (PA) and those in a sad mood would experience increases in negative affect (NA). A large sample of college students (N = 703) were randomly assigned to a happy, sad, or neutral mood induction before SMU. PA and NA were assessed at baseline, post-mood induction, and after SMU. Contrary to hypotheses, after SMU, people in happy moods experienced decreases in PA, and those in sad moods experienced decreases in NA, reflecting SMU having a dampening effect on emotions. PA and NA were significantly lower after SMU compared to baseline and did not vary by condition. How young adults feel when they log onto SMU matters in understanding how SMU impacts PA and NA, but on average, emotional experiences are dampened. (shrink)

In this paper, we use the risk apportionment technique of Eeckhoudt, Rey and Schlesinger (2007) to study higher order risk preferences for others’ health as well as ex-ante and ex-post inequality preferences for social risky distributions, and their interaction. In an experiment on a sample of university students acting as impartial spectators, we observe risk aversion towards social health losses and a dislike of ex-ante inequality. In addition, evidence for ex-post inequality seeking is much weaker than evidence for (...) ex-ante inequality aversion. Because ex-ante inequality aversion is unrelated to risk aversion, we conclude that simple forms of utilitarianism are not relevant for individual judgment of social risk over health. Last, our investigation of precautionary distribution, which would occur when one particular group in the society suffers from background health risk, shows substantial polarization of preferences. (shrink)

Any experimental field consists of preparing special conditions for examining interesting objects for research. So naturally, the particular ways in which scientists prepare their objects determine the kind and the content of knowledge produced. This book provides a framework for the analysis of experimental practices - the Social Epistemology of Experiment - that incorporates both the ‘material’ and the ‘social’ dimensions of knowledge production. The Social Epistemology of Experiment is applied to experimental economics and in so doing, (...) it introduces the epistemic role of the participation of human subjects in experiments and the causal efficacy of institutions in constraining and enabling human behaviour. It also develops the role of the social and socially established practices in overcoming the methodological difficulties associated with experimenting with humans subjects in the social sciences as well as the effect of scientists’ interventions in the laboratory worlds. This book provides an historical and contextualized account of the emergence of experimental economics, the methodological discussions that have informed and constituted it, its main research programmes, and stylized facts. The analysis of its three main research programmes – market experiments, game theory experiments and individual decision-making experiments – shows how economics experiments are particularly tailored to produce knowledge about market institutions and individual behaviour in contexts where there might be conflicts of individual and social goals, and also about the processes of individual decision-making. (shrink)

This article explores some issues having to do with the use of experimental results from one‐shot games to reach conclusions about the existence of social preferences that are taken to figure in the explanation of cooperation in repeated interactions in real life. †To contact the author, please write to: Division of Humanities and Social Sciences, California Institute of Technology, Pasadena, CA 91125; e‐mail: [email protected].

It is sometimes argued that experimental economists do not have to worry about external validity so long as the design sticks closely to a theoretical model. This position mistakes the model for the theory. As a result, applied economics designs often study phenomena distinct from their stated objects of inquiry. Because the implemented models are abstract, they may provide improbable analogues to their stated subject matter. This problem is exacerbated by the relational character of the social world, which also (...) sets epistemic limits for the social science laboratory more generally. (shrink)

Computational simulations have provided evidence that the use of linguistic cues as group markers plays an important role in the development of linguistic diversity shortcite. Other simulations, however, have contradicted these findings. Similar disagreements exist in sociolinguistics. This paper describes an experimental study in which participants played an anonymous economic game using an instant-messenger-style program and an artificial ‘alien language’. The competitiveness of the game and the frequency with which players interacted were manipulated. Given frequent enough interaction with team-mates, players (...) were able to use linguistic cues to identify themselves. In the most competitive condition, this led to divergence in the language, which did not occur in other conditions. This suggests that both frequency of interaction and a pressure to use language to mark identity play a significant role in encouraging linguistic divergence over short periods, but that neither is suffi cient on its own. (shrink)

Computational simulations have provided evidence that the use of linguistic cues as group markers plays an important role in the development of linguistic diversity shortcite. Other simulations, however, have contradicted these findings. Similar disagreements exist in sociolinguistics. This paper describes an experimental study in which participants played an anonymous economic game using an instant-messenger-style program and an artificial ‘alien language’. The competitiveness of the game and the frequency with which players interacted were manipulated. Given frequent enough interaction with team-mates, players (...) were able to use linguistic cues to identify themselves. In the most competitive condition, this led to divergence in the language, which did not occur in other conditions. This suggests that both frequency of interaction and a pressure to use language to mark identity play a significant role in encouraging linguistic divergence over short periods, but that neither is suffi cient on its own. (shrink)

This paper examines how experimental scientists choose theoretical frameworks as well as their experimental systems for doing research. I start out with Kuhn's claim that there are no algorithms that could determine the coices made by individual scientists. Samir Okasha has recently provided an argument for this claim in terms of social choice theory, which I briefly discuss. Then, I show why this problem is not relevant in an experimental science. There are social mechanisms in place that make (...) sure the community chooses the best framework and a matching experimental system. As historical evidence for this claim, I present the case of classical genetics. (shrink)

Abstractabstract:The aim of this article is to analyze the close relation between social theory (“sociological phenomenalism”) and the political ideology of the Polish thinker Edward Abramowski. Abramowski’s “applied sociology” involved: (1) the sociology of “fraternity,” examining basic forms of socialization; (2) combining social revolution with ethical self-improvement; and (3) the dissemination of “social laboratories” through the development of a network of cooperatives. As “experiments of the will,” the cooperatives allowed Abramowski to combine science, imagination, and ethics in (...) a coherent project of political utopia-building, extending the possible forms of community. Finally, the article shows that in Abramowski’s case, the meaning of utopia as an element embedded in a wide range of political practices derives from his vision of social science. Due to the influence that Abramowski’s thought had on political reality in Poland, the concept of “experimental” utopia entered the vocabulary of modern social sciences in Poland for good. (shrink)

We applaud the authors' basic message. We note that the negative research emphasis is not special solely to social psychology and judgment and decision-making. We argue that the proposed integration of null hypothesis significance testing (NHST) and Bayesian analysis is promising but will ultimately succeed only if more attention is paid to proper experimental design and implementation.

It is sometimes argued that experimental economists do not have to worry about external validity so long as the design sticks closely to a theoretical model. This position mistakes the model for the theory. As a result, applied economics designs often study phenomena distinct from their stated objects of inquiry. Because the implemented models are abstract, they may provide improbable analogues to their stated subject matter. This problem is exacerbated by the relational character of the social world, which also (...) sets epistemic limits for the social science laboratory more generally. (shrink)

Almaatouq et al.'s prescription for more integrative experimental designs is welcome but does not address an equally important problem: Lack of adequate theories. We highlight two features theories ought to satisfy: “Well-specified” and “grounded.” We discuss the importance of these features, some positive exemplars, and the complementarity between the target article's prescriptions and improved theorizing.

Como parte del proyecto europeo Playeurope se ha querido conocer las experiencias de los estudiantes de los grados en Educación Infantil y Primaria para concienciar sobre la importancia de ser ciudadanos activos. La investigación realizada en 2022 conserva un diseño descriptivo cuantitativo, combinado con aspectos cualitativos. Se cuenta con una muestra de doscientos estudiantes de España e Italia. Los resulta- dos profundizan en la falta de formación al respecto a nivel universitario. El haber realizado el Manual de historias de éxito (...) y la Guía para ser un emprendedor social ha resultado ser un avance significativo en el aprendizaje de los futuros docentes. (shrink)

Inductive thinking is a universal human habit; we generalise from our experiences the best we can. The induction problem is to identify which observed regularities provide reasonable justification for inductive conclusions. In the natural sciences, we can often use strict laws in making successful inferences about unobserved states of affairs. In the social sciences, by contrast, we have no strict laws, only regularities which most often are conditioned on ceteris paribus clauses. This makes it much more difficult to make (...) reliable inferences in the social sciences. In particular, we want knowledge about general causal relations in order to be able to determine what to do in order to achieve a certain state of affairs. Knowledge about causal relations that are also valid in the future requires experiments or so called ‘natural experiments’. Only knowledge derived from such experiences enable us to draw reasonably reliable inferences about how to act in order to achieve our goals. (shrink)

A correlational pilot study (N = 143) and an integrative data analysis of two experiments (total N = 377) provide evidence linking anger to the psychology of social hierarchy. The experiments demonstrate that the experience of anger increases the psychological accessibility of implicit cognitions related to social hierarchy: compared to participants in a control condition, participants in an anger-priming condition completed word stems with significantly more hierarchy-related words. We found little support for sex differences in the effect of (...) anger on implicit hierarchy-related cognition; effects were equivalent across male and female participants. Findings fit with functionalist evolutionary views of anger suggesting that anger may motivate the use of dominance to strive for high social rank in group hierarchies. Implications for downstream behaviour, including aggression and negotiation, are discussed. (shrink)

Even though standard economic theory traditionally ignored any motives that may drive incentivized social decision making except for the maximization of personal consumption utility, the idea that ‘preferences for fairness’ (following social norms) might have an economically tangible impact appeared relatively early. I trace the evolution of these ideas from the first experiments on bargaining to the tests of the hypothesis that pro-sociality in general is driven by the desire to adhere to social norms. I show how (...) a recent synthesis of economics approach with psychology, sociology, and evolutionary human biology can give rise to a mathematically rigorous, psychologically plausible, and falsifiable theory of social norms. Such a theory can predictwhich norms should emerge in each specific (social) context and is capable of organizing diverse observations in economics and other disciplines. It provides the first glimpse at how a unified theory of normative decision making might look like. (shrink)

Social identity is embedded in social structures, generated by various social processes, and has multiple dimensions. We report findings from a laboratory experiment eliciting two-dimensional social identities: a horizontal identity determined either randomly or by preferences and a vertical identity defined by income status and determined either by luck or performance. We also vary income gaps between vertical identity groups. Participants make redistributive allocation decisions between two beneficiaries differing in identity attributes. We find robust evidence of (...) in-group favoritism and that both the identity distance between the allocator and the in-group recipient and income gaps influence the degree of in-group favoritism. (shrink)

In this paper it is argued that a) altruism is an inadequate label for human cooperative behavior, and b) an adequate account of cooperation has to depart from the standard economic model of human behavior by taking note of the agents' capacity to see themselves and act as team-members. Contrary to what Fehr et al. seem to think, the main problem of the conceptual limitations of the standard model is not so much the assumption of sel shness but rather the (...) atomistic conception of the individual. A much-neglected question of the theory of cooperation is how the agent's social identity is determined, i.e. how individuals come to think of themselves and act as members of a group. Considering as an example one of Fehr et al.'s third party punishment experiments, I shall argue that the agents' identities are strongly in uenced by the way the experiment is presented to the participants, especially by the collectivity-related vocabulary used in the instructions. (shrink)

In this paper we review the literature on social learning mechanisms in the domestic chick, focusing largely on work from our own laboratories. The domestic chicken is a social-living bird that searches for food in flocks, avoids predators by following warnings from other flock members, and forms (stable) social hierarchies. All of these behaviors develop throughout ontogeny, largely during the very early stages post-hatch. Newly hatched chicks appear to have predispositions to orient towards and to pay greatest (...) attention to the biologically relevant characteristics of their immediate environment (i.e. to conspecifics: the mother bird and/or fellow hatchlings) from which they may subsequently learn. In addition, the chick has a lateralized brain; left and right hemispheres being specialized for certain behavioral functions and responses, and it appears that such behavioral lateralization is also transposed onto certain social learning situations, which will also be considered. Keywords: social learning; social cognition; chick; brain asymmetry. (shrink)

The ArgumentThe notion that experimentation provides an appropriate means for acquiring valid knowledge about some aspects of social reality has always depended on certain presuppositions about the nature of social reality and about the role of expenment in knowledge acquisition. In this paper I examine historical changes in these presuppositions from the beginnings of social psychological experimentation to the period after World War II.It was late nineteenth-century crowd psychology that provided the theoretical inspiration fo the (...) first systematic steps in the application of expermental methods to the investigation of social psychological problems. The basic question addressed by these early experiments was derived from the individualistic social ontology of crowd psychology. It was this ontology that made the microcosm of the experimental situation appear relevant to social reality outside this situation.In the 1940s experimental social psychology was briefly influenced by a nonindividualistic social ontology for which group phenomena were real. In the work of Kurt Lewin this was linked to an anti-inductivist conception of experimentation derived from Gestalt psychology and the philosophy of Ernst Cassirer. However, this model proved to be utterly unassimilable by American social psychology which was dominated by an individualistic social ontology and an inductivist philosophy of experimentation that mutually supported each other. (shrink)

People do not behave strictly so as to maximize monetary payoffs in ex- perimental games such as Public Goods and Ultimatum games. To explain this ‘anomaly’, behavioural economists have proposed so-called social pref- erence models that try to capture other-regarding preferences as additional arguments of players’ util- ity functions. However, none of the proposed model has successfully ex- plained data across different games. I give a proper diagnosis to this situa- tion by examining Woodward’s methodological critique of the (...) class='Hi'>social preference approach. I argue that the problem lies not in external validity as Woodward argues, but internal validity of those experiments. Specifically, I defend the one-shot design as a useful paradigm as long as it is internally valid. (shrink)

Social media chat groups, such as WeChat and WhatsApp groups, are widely applied in online communication. This research has conducted two studies to examine the individual level and collective level’s opinion dynamics in those groups. The opinion dynamic is driven by two variables, people’s perceived peer support and willingness of opinion expression. The perceived peer support influences the willingness of opinion expression, and the willingness influences the dynamics of real opinion-expression. First, the quasi-experimental study recruited twenty-five participants as the (...) observation group and found that decreasing perceived peer support would significantly increase individuals’ expression willingness to protect his/her opinion. To generalize the individual level findings to a collective level, the second study treated the social media chat groups as an undirected fully-connected social network and simulated people’s opinion expression dynamics with an agent-based model. The simulation indicated that with the help of increased willingness of opinion expression, the minority opinion supporters as a collective did not fall silent but continue to express themselves and increasing willingness of opinion expression would maintain the existence of minority opinion but could not help the minority reverse to the majority. (shrink)