Principles and Practice of Structural Equation Modeling (2nd ed.)

https://science.sciencemag.org/content/sci/5/110/206.full.pdf

The american psychological association.

This is a review of Collected Works of John Tate. Parts I, II, edited by Barry Mazur and Jean-Pierre Serre. American Mathematical Society, Providence, Rhode Island, 2016. For several decades it has been clear to the friends and colleagues of John Tate that a “Collected Works” was merited. The award of the Abel Prize to Tate in 2010 added impetus, and finally, in Tate’s ninety-second year we have these two magnificent volumes, edited by Barry Mazur and Jean-Pierre Serre. Beyond Tate’s published articles, they include five unpublished articles and a selection of his letters, most accompanied by Tate’s comments, and a collection of photographs of Tate. For an overview of Tate’s work, the editors refer the reader to [4]. Before discussing the volumes, I describe some of Tate’s work. 1. Hecke L-series and Tate’s thesis Like many budding number theorists, Tate’s favorite theorem when young was Gauss’s law of quadratic reciprocity. When he arrived at Princeton as a graduate student in 1946, he was fortunate to find there the person, Emil Artin, who had discovered the most general reciprocity law, so solving Hilbert’s ninth problem. By 1920, the German school of algebraic number theorists (Hilbert, Weber, . . .) together with its brilliant student Takagi had succeeded in classifying the abelian extensions of a number field K: to each group I of ideal classes in K, there is attached an extension L of K (the class field of I); the group I determines the arithmetic of the extension L/K, and the Galois group of L/K is isomorphic to I. Artin’s contribution was to prove (in 1927) that there is a natural isomorphism from I to the Galois group of L/K. When the base field contains an appropriate root of 1, Artin’s isomorphism gives a reciprocity law, and all possible reciprocity laws arise this way. In the 1930s, Chevalley reworked abelian class field theory. In particular, he replaced “ideals” with his “idèles” which greatly clarified the relation between the local and global aspects of the theory. For his thesis, Artin suggested that Tate do the same for Hecke L-series. When Hecke proved that the abelian L-functions of number fields (generalizations of Dirichlet’s L-functions) have an analytic continuation throughout the plane with a functional equation of the expected type, he saw that his methods applied even to a new kind of L-function, now named after him. Once Tate had developed his harmonic analysis of local fields and of the idèle group, he was able prove analytic continuation and functional equations for all the relevant L-series without Hecke’s complicated theta-formulas. Received by the editors September 5, 2016. 2010 Mathematics Subject Classification. Primary 01A75, 11-06, 14-06. c ©2017 American Mathematical Society

The collected works

The problem of which cues, internal or external, permit a person to label and identify his own emotional state has been with us since the days that James (1890) first tendered his doctrine that \"the bodily changes follow directly the perception of the exciting fact, and that our feeling of the same changes as they occur is the emotion\" (p. 449). Since we are aware of a variety of feeling and emotion states, it should follow from James' proposition that the various emotions will be accompanied by a variety of differentiable bodily states. Following James' pronouncement, a formidable number of studies were undertaken in search of the physiological differentiators of the emotions. The results, in these early days, were almost uniformly negative. All of the emotional states experi-

"Cognitive, social, and physiological determinants of emotional state": Erratum

The article reviews the book "Alone Together: Why We Expect More From Technology and Less From Each Other," by Sherry Turkle.

Alone Together: Why We Expect More from Technology and Less from Each Other.

This meta-analysis reviews the findings of 51 studies (N = 14,378) examining the associations among teacher credibility, teacher behaviors, and student outcomes. When all three dimensions of credibility are considered collectively (i.e., competence, trustworthiness, and caring), the cumulative evidence indicates a moderate, meaningful relationship between teacher credibility and overall outcomes (r=.448). Similar overall effect sizes were observed for competence (r=.481), trustworthiness (r=.477), and caring (r=.554), though the overall effect size for caring was greater in magnitude than that obtained for credibility measured as a single factor (r=.294). On average, higher correlations were observed when researchers measured all three dimensions of credibility (r=.518) than when they only measured competence and character (r=.256). Collectively, the results highlight the unique contributions of perceived caring to the teacher credibility construct, as well as the meaningful role that teacher credibility ...

A Meta-Analytical Review of Teacher Credibility and its Associations with Teacher Behaviors and Student Outcomes

In this study, we examined the relationship between perceived technology policies and perceived teacher credibility, as well as the extent to which teachers' use of power bases mediates this association. Participants included 294 undergraduate students from a private university in the Southwest. Results revealed that policies encouraging technology use for educational purposes are related to all three dimensions of teacher credibility (i.e., competence, character, and caring), whereas failing to establish clear technology policies is associated with reduced credibility. Further, teacher power mediates the relationship between perceived teacher technology policies and perceived teacher credibility. Results suggest that instructors should have clear technology policies in place, regardless whether the policies permit or restrict wireless communication technology in the classroom.

Teacher Power Mediates the Effects of Technology Policies on Teacher Credibility

This study examined students' perceived understanding as a mediator of the relationship between student perceptions of teacher clarity, nonverbal immediacy cues, and learner empowerment (i.e., meaningfulness, competence, and impact). Participants included 261 undergraduate students who completed survey instruments. Results of structural equation modeling indicated that students' perceptions of teacher clarity and nonverbal immediacy enhanced students' perceived understanding, which in turn positively predicted all three dimensions of learner empowerment. Bootstrapping analyses revealed significant indirect effects for student perceptions of teacher clarity and immediacy on the impact and competence dimensions of learner empowerment. Collectively, the results highlight perceived understanding as a key theoretical mechanism that further explains the associations among student perceptions of instructors' communication behaviors and learner empowerment.

Students' Perceived Understanding Mediates the Effects of Teacher Clarity and Nonverbal Immediacy on Learner Empowerment.

Increased public speaking confidence is often cited as a major benefit for undergraduates taking the basic communication course. Several scholars have reported that the state anxiety of novice speakers declines progressively during performance, a phenomenon called within-session habituation. However, the contributions of these short-term reductions in fear to the development of confidence from one speech to the next, or between-sessions habituation, remain unknown. The current study examines brief repeated exposure to audiences as a strategy for creating habituation during public speaking performances in the basic course. One hundred forty undergraduate students enrolled in a required speech performance course participated in a quasi-experimental study in which course lab sections served as intact groups. Results were generally consistent with Foa's emotional processing theory. Implications for basic course pedagogy and suggestions for future research in this area are advanced.

Examining the Effect of Exposure Therapy on Public Speaking State Anxiety

In this study, we investigated the association between instructor technology use policies and learner empowerment Specifically, we employed Turman and Schrodt's principle of moderation, predicting that learner empowerment would be highest when instructors moderately encourage course-relevant technology use and moderately discourage nonrelevant use Results instead indicated a positive linear association between encouraging policies and learner empowerment, and a curvilinear effect for discouraging policies (with learner empowerment lowest at a moderate level of such policies) Apprehension about communicating online moderated the association between discouraging policies and learner empowerment One implication of these results is that students expect course-relevant technology access yet also desire teacher clarity regarding permissible technology use in the classroom Students apprehensive about technology may especially value such clarity

Amber N. Finn

Papers

A Meta-Analytical Review of Teacher Credibility and its Associations with Teacher Behaviors and Student Outcomes

Teacher Power Mediates the Effects of Technology Policies on Teacher Credibility

Students' Perceived Understanding Mediates the Effects of Teacher Clarity and Nonverbal Immediacy on Learner Empowerment.

Examining the Effect of Exposure Therapy on Public Speaking State Anxiety

Teacher Technology Policies and Online Communication Apprehension as Predictors of Learner Empowerment