Hypotheses involving mediation are common in the behavioral sciences. Mediation exists when a predictor affects a dependent variable indirectly through at least one intervening variable, or mediator. Methods to assess mediation involving multiple simultaneous mediators have received little attention in the methodological literature despite a clear need. We provide an overview of simple and multiple mediation and explore three approaches that can be used to investigate indirect processes, as well as methods for contrasting two or more mediators within a single model. We present an illustrative example, assessing and contrasting potential mediators of the relationship between the helpfulness of socialization agents and job satisfaction. We also provide SAS and SPSS macros, as well as Mplus and LISREL syntax, to facilitate the use of these methods in applications.

https://link.springer.com/content/pdf/10.3758/BRM.40.3.879.pdf

Asymptotic and resampling strategies for assessing and comparing indirect effects in multiple mediator models

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Using Multivariate Statistics

From the Publisher: 
A Question of Identity 
Life on the Screen is a fascinating and wide-ranging investigation of the impact of computers and networking on society, peoples' perceptions of themselves, and the individual's relationship to machines. Sherry Turkle, a Professor of the Sociology of Science at MIT and a licensed psychologist, uses Internet MUDs (multi-user domains, or in older gaming parlance multi-user dungeons) as a launching pad for explorations of software design, user interfaces, simulation, artificial intelligence, artificial life, agents, "bots," virtual reality, and "the on-line way of life." 
Turkle's discussion of postmodernism is particularly enlightening. She shows how postmodern concepts in art, architecture, and ethics are related to concrete topics much closer to home, for example AI research (Minsky's "Society of Mind") and even MUDs (exemplified by students with X-window terminals who are doing homework in one window and simultaneously playing out several different roles in the same MUD in other windows). Those of you who have (like me) been turned off by the shallow, pretentious, meaningless paintings and sculptures that litter our museums of modern art may have a different perspective after hearing what Turkle has to say. 
This is a psychoanalytical book, not a technical one. However, software developers and engineers will find it highly accessible because of the depth of the author's technical understanding and credibility. Unlike most other authors in this genre, Turkle does not constantly jar the technically-literate reader with blatant errors or bogus assertions about how things work. Although I personally don't have time or patience for MUDs,view most of AI as snake-oil, and abhor postmodern architecture, I thought the time spent reading this book was an extremely good investment.

스크린 위의 삶 = Life on the screen : identity in the age of the internet

Following the 2016 U.S. presidential election, many have expressed concern about the effects of false stories (“fake news”), circulated largely through social media. We discuss the economics of fake news and present new data on its consumption prior to the election. Drawing on web browsing data, archives of fact-checking websites, and results from a new online survey, we find: (i) social media was an important but not dominant source of election news, with 14 percent of Americans calling social media their “most important” source; (ii) of the known false news stories that appeared in the three months before the election, those favoring Trump were shared a total of 30 million times on Facebook, while those favoring Clinton were shared 8 million times; (iii) the average American adult saw on the order of one or perhaps several fake news stories in the months around the election, with just over half of those who recalled seeing them believing them; and (iv) people are much more likely to believe stories that favor their preferred candidate, especially if they have ideologically segregated social media networks.

/pdf/social-media-and-fake-news-in-the-2016-election-1m4ttkb5mo.pdf

Social Media and Fake News in the 2016 Election

A number of emerging technologies including virtual reality, simulation rides, video conferencing, home theater, and high definition television are designed to provide media users with an illusion that a mediated experience is not mediated, a perception defined here as presence. Traditional media such as the telephone, radio, television, film, and many others offer a lesser degree of presence as well. This article examines the key concept of presence. It begins by noting practical and theoretical reasons for studying this concept. Six conceptualizations of presence found in a diverse set of literatures are identified and a detailed explication of the concept that incorporates these conceptualizations is presented. Existing research and speculation about the factors that encourage or discourage a sense of presence in media users as well as the physiological and psychological effects of presence are then outlined. Finally, suggestions concerning future systematic research about presence are presented.

At the Heart of It All: The Concept of Presence

This article responds to recent calls for conceptual and methodological refinement, issued by uses-and-gratifications scholars (Rubin, 2009; Ruggiero, 2000), for studying emergent media. Noting that studies on the uses of the Internet have generated a list of gratifications that are remarkably similar to those obtained from older media, it identifies two measurement artifacts—(1) measures designed for older media are used to capture gratifications from newer media; and (2) gratifications are conceptualized and operationalized too broadly (e.g., information-seeking), thus missing the nuanced gratifications obtained from newer media. It challenges the notion that all gratifications are borne out of innate needs, and proposes that affordances of media technology can shape user needs, giving rise to new and distinctive gratifications. A sample of new gratifications and potential measures for those are provided.

Uses and Grats 2.0: New Gratifications for New Media

This study attempts a new conceptualization of communication “sources” by proposing a typology of sources that would apply not only to traditional media but also to new online media. Ontological rationale for the distinctions in the typology is supplemented by psychological evidence via an experiment that investigated the effects of different types of source attributions upon receivers’ perception of online news content. Participants (N = 48) in a 4-condition, between-participants experiment read 6 identical news stories each through an online service. Participants were told that the stories were selected by 1 of 4 sources: news editors, the computer terminal on which they were accessing the stories, other audience members (or users) of the online news service, or (using a pseudo-selection task) the individual user (self). After reading each online news story, all participants filled out a paperand-pencil questionnaire indicating their perceptions of the story they had just read. In confirmation of the distinctions made in the typology, attribution of identical content to 4 different types of online sources was associated with significant variation in news story perception. Theoretical implications of the results as well as the typology are discussed.

https://terpconnect.umd.edu/~nan/738readings/Sundar%20Nass%202010%20sources%20of%20online%20news.pdf

Conceptualizing Sources in Online News

This study identifies two distinct conceptualizations of interactivity in the communication literature—the functional view and the contingency view. Although the functional view has predominated academic research on interactivity, this study operationalizes the contingency view in the context of an experiment designed to investigate the impression formation effects of interactivity in Web-based mass communication. A third of the participants in a between-participants experiment (N=60) were exposed to the lowinteractivity version (no hyperlinks) of a political candidate’s Web site, another third to the medium-interactivity version (a single layer of related links), and the remaining third to the high-interactivity version (two hierarchical layers of related links). The results indicate that the level of Web site interactivity influenced participants’ perceptions of the candidate as well as their levels of agreement with his policy positions. Implications for conceptual development of interactivity are disc...

Explicating Web Site Interactivity: Impression Formation Effects in Political Campaign Sites

What makes customization so appealing? Is it because the content is tailored or because the user feels greater agency? Study 1 tested these propositions with a news-aggregator Website that was either personalized (system-tailored), customized (user-tailored), or neither. Power users rated content quality higher when it had a customizable interface, whereas nonpower users preferred personalized content. In Study 2, half the participants were told that their browsing information may be used for providing requested services while the other half was told that it would not be used. The interaction found in Study 1 was observed only under conditions of low privacy, with the pattern being reversed under high privacy. Significant three-way interactions were found for sense of control and perceived convenience.

https://terpconnect.umd.edu/~nan/738readings/Sundar%20Marathe%202010%20personalization.pdf

Personalization versus customization: The importance of agency, privacy, and power usage

Internet technology has made possible the widespread dissemination of individualized media messages, but we know very little about their psychological import. A between-subjects experiment (N =60) with three levels of customization (low, medium, high) was designed to examine whether greater levels of personalized content engender more positive attitudes. The results not only confirm this hypothesis but also reveal the mediating role played by users’ perceptions of relevance, involvement, interactivity, and novelty of portal content. In addition, customization has behavioral effects in that it affects users’ browsing activity.

S. Shyam Sundar

Papers

Uses and Grats 2.0: New Gratifications for New Media

Conceptualizing Sources in Online News

Explicating Web Site Interactivity: Impression Formation Effects in Political Campaign Sites

Personalization versus customization: The importance of agency, privacy, and power usage

The Psychological Appeal of Personalized Content in Web Portals: Does Customization Affect Attitudes and Behavior?