Testing motivational and self-regulatory mechanisms of action on device-measured physical activity in the context of a weight loss maintenance digital intervention: A secondary analysis of the NoHoW trial

BackgroundTo date, few digital behavior change interventions for weight loss maintenance focusing on long-term physical activity promotion have used a sound intervention design grounded on a logic model underpinned by behavior change theories. The current study is a secondary analysis of the weight loss maintenance NoHoW trial and investigated putative mediators of device-measured long-term physical activity levels (six to 12 months) in the context of a digital intervention.MethodsA subsample of 766 participants (Age = 46.2 ± 11.4 years; 69.1% female; original NoHoW sample: 1627 participants) completed all questionnaires on motivational and self-regulatory variables and had all device-measured physical activity data available for zero, six and 12 months. We examined the direct and indirect effects of Virtual Care Climate on post intervention changes in moderate-to-vigorous physical activity and number of steps (six to 12 months) through changes in the theory-driven motivational and self-regulatory mechanisms of action during the intervention period (zero to six months), as conceptualized in the logic model.ResultsModel 1 tested the mediation processes on Steps and presented a poor fit to the data. Model 2 tested mediation processes on moderate-to-vigorous physical activity and presented poor fit to the data. Simplified models were also tested considering the autonomous motivation and the controlled motivation variables independently. These changes yielded good results and both models presented very good fit to the data for both outcome variables. Percentage of explained variance was negligible for all models. No direct or indirect effects were found from Virtual Care Climate to long term change in outcomes. Indirect effects occurred only between the sequential paths of the theory-driven mediators.ConclusionThis was one of the first attempts to test a serial mediation model considering psychological mechanisms of change and device-measured physical activity in a 12-month longitudinal trial. The model explained a small proportion of variance in post intervention changes in physical activity. We found different pathways of influence on theory-driven motivational and self-regulatory mechanisms but limited evidence that these constructs impacted on actual behavior change. New approaches to test these relationships are needed. Challenges and several alternatives are discussed.Trial registrationISRCTN Registry, ISRCTN88405328. Registered December 16, 2016, https://www.isrctn.com/ISRCTN88405328.     

Technologies émergentes et transformations digitales de l’activité : enjeux pour l’activité et la santé au travail

The question of the introduction of emerging technologies and their incessant renewal in organizations basically refers to the place and role that these devices play in activity, as well as how they can affect activity and health at work … Thought as a prospective reflection trying to grasp the logic and the modalities of the digital transformations in progress, the ambition of this paper is: (i) first, identify and characterize the emerging technologies that are deployed in the company; (ii) discuss their impact on the activity and well-being of employees, showing the uses and paradoxical effects that these devices can have on work; and (iii) finally think about the psychosocial function of these devices as potential health and business development operators.     

@Preacher_Bot: an experiment in evangelical speech making

This article is an experiment in digital methodology. It applies tools associated with the digital humanities to the study of Protestant evangelicalism in order to ask what digital research methods can offer the study of religion. Beginning with the development of a social media computer program called a Twitter bot designed to mimic evangelical ministers on twitter, the article considers how digital scholarship allows the work scholars produce to mirror more closely the religious worlds they study. Next, the article analyzes the results of the program using text analysis software. In documenting trends in the bot's output, the article highlights how digital research methods can help answer long-standing questions in the field as well as potentially ask new ones. It concludes, The article, then, is both an exploration of contemporary religious cultures and a consideration of new media methods for analyzing them.     

Error analysis of digital filters using HOL theorem proving

When a digital filter is realized with floating-point or fixed-point arithmetics, errors and constraints due to finite word length are unavoidable. In this paper, we show how these errors can be mechanically analysed using the HOL theorem prover. We first model the ideal real filter specification and the corresponding floating-point and fixed-point implementations as predicates in higher-order logic. We use valuation functions to find the real values of the floating-point and fixed-point filter outputs and define the error as the difference between these values and the corresponding output of the ideal real specification. Fundamental analysis lemmas have been established to derive expressions for the accumulation of roundoff error in parametric Lth-order digital filters, for each of the three canonical forms of realization: direct, parallel, and cascade. The HOL formalization and proofs are found to be in a good agreement with existing theoretical paper-and-pencil counterparts.     

Against digital ontology

The paper argues that digital ontology (the ultimate nature of reality is digital, and the universe is a computational system equivalent to a Turing Machine) should be carefully distinguished from informational ontology (the ultimate nature of reality is structural), in order to abandon the former and retain only the latter as a promising line of research. Digital vs. analogue is a Boolean dichotomy typical of our computational paradigm, but digital and analogue are only “modes of presentation” of Being (to paraphrase Kant), that is, ways in which reality is experienced or conceptualised by an epistemic agent at a given level of abstraction. A preferable alternative is provided by an informational approach to structural realism, according to which knowledge of the world is knowledge of its structures. The most reasonable ontological commitment turns out to be in favour of an interpretation of reality as the totality of structures dynamically interacting with each other. The paper is the first part (the pars destruens) of a two-part piece of research. The pars construens, entitled “A Defence of Informational Structural Realism”, is developed in a separate article, also published in this journal.     

Historical impact in psychology differs between demographic groups

Psychology has a long tradition of creating lists of the most eminent members of the discipline. Such lists are typically created under the assumption that there is a general answer to the question of eminence, covering all psychologists everywhere. We wondered, however, to what degree perceived eminence depends on the individual's particular demographic situation. Specifically, are different historical figures “eminent” to people of different genders, ages, and geographical locations? We tested this by asking a wide swath of people – mostly psychologists – who they think has had the most impact on the discipline of psychology, historically. We used an online game in which “players” were shown a series of pairs of significant figures from psychology's past and asked to select which had had the greater impact. We then converted these selections into a ranked list using the Elo rating system. Although our overall rankings had considerable similarity with traditional efforts, we also found that rankings differed markedly among different demographic groups, undermining the assumption of a general measure of eminence that is valid for all.     

A field is to play. Enacting mental images of the soundscape

The article mainly focuses on the presentation of “A field is to play”, a collaborative and interactive installation dedicated to the recording and the reenacting of the relationship between the inhabitants of Mazama, WA – a small community in the USA – and their sonic environment. Through multimedia local interactions, enaction and emplacement, the project aimed to give expression to the many, individual and socially constructed, mental images of the local soundscape. A physical, interactive audio installation presented excerpts from individual interviews, emplacing and activating such mental representations, to merge them back into the environment. The artistic intervention was conceived as a localised process, acting through an engagement with publics. The soundscape itself, and its mental representations, were manipulated both as relational media, and subject matter. The presentation is preceded by three sections that introduce the theoretical context at the origin of the installation starting from urban theory in architecture, to the role of public art up to the discussion around the topic of soundscape, in a path from the most general issues to those more related to the specific character of the installation. The conclusion pulls together the theoretical and the applied sections and offers some response to the questions raised in the introduction. Through a theoretical engagement with the installation, it asks the reader to rethink the relationship between sound, memory and mental images.     

Communication accommodation in text messages: Exploring liking,power, and sex as predictors of textisms

This mixed-methods study applies Communication Accommodation Theory to explore how liking, power, and sex predict one’s likelihood for using textisms in digital interpersonal interactions. Textisms are digital cues that convey nonverbal meaning and emotion in text communication. The main experiment used a hypothetical texting scenario to manipulate textism amounts (none/many) and participant’s perceived power levels (low/equal/high) during texting interactions to examine the number of textisms participants used in subsequent responses in comparison to the number of textisms they viewed. Primary results show that (1) participants moderately converged to use similar amounts of textisms, and (2) those with low power who viewed many textisms were more likely to use textisms themselves during subsequent responses. Through the examination of adaption behaviors in text messaging, scholars can better understand the contexts in which users will include textisms to intentionally convey nonverbal meaning and emotion in digital communication.     

Accessing Digital Images

SUMMARY

This article discusses sources for and issues related to digital Christian art images available on the Internet. An annotated list of relevant Web sites is listed, along with advice on how to locate specific images. Also included in the article are discussions of vocabulary, fact verification, and copyright issues.