Reconciling the influence of task-set switching and motor inhibition processes on stop signal after-effects.

Executive response functions can be affected by preceding events, even if they are no longer associated with the current task at hand. For example, studies utilizing the stop signal task have reported slower response times to "GO" stimuli when the preceding trial involved the presentation of a "STOP" signal. However, the neural mechanisms that underlie this behavioral after-effect are unclear. To address this, behavioral and electroencephalography (EEG) measures were examined in 18 young adults (18-30 years) on "GO" trials following a previously "Successful Inhibition" trial (pSI), a previously "Failed Inhibition" trial (pFI), and a previous "GO" trial (pGO). Like previous research, slower response times were observed during both pSI and pFI trials (i.e., "GO" trials that were preceded by a successful and unsuccessful inhibition trial, respectively) compared to pGO trials (i.e., "GO" trials that were preceded by another "GO" trial). Interestingly, response time slowing was greater during pSI trials compared to pFI trials, suggesting executive control is influenced by both task set switching and persisting motor inhibition processes. Follow-up behavioral analyses indicated that these effects resulted from between-trial control adjustments rather than repetition priming effects. Analyses of inter-electrode coherence (IEC) and inter-trial coherence (ITC) indicated that both pSI and pFI trials showed greater phase synchrony during the inter-trial interval compared to pGO trials. Unlike the IEC findings, differential ITC was present within the beta and alpha frequency bands in line with the observed behavior (pSI > pFI > pGO), suggestive of more consistent phase synchrony involving motor inhibition processes during the ITI at a regional level. These findings suggest that between-trial control adjustments involved with task-set switching and motor inhibition processes influence subsequent performance, providing new insights into the dynamic nature of executive control

Bots increase exposure to negative and inflammatory content in online social systems

Societies are complex systems which tend to polarize into sub-groups of individuals with dramatically opposite perspectives. This phenomenon is reflected -- and often amplified -- in online social networks where, however, humans are no more the only players, and co-exist alongside with social bots, i.e., software-controlled accounts. Analyzing large-scale social data collected during the Catalan referendum for independence on October 1, 2017, consisting of nearly 4 millions Twitter posts generated by almost 1 million users, we identify the two polarized groups of Independentists and Constitutionalists and quantify the structural and emotional roles played by social bots. We show that bots act from peripheral areas of the social system to target influential humans of both groups, bombarding Independentists with violent contents, increasing their exposure to negative and inflammatory narratives and exacerbating social conflict online. Our findings stress the importance of developing countermeasures to unmask these forms of automated social manipulation.Comment: 8 pages, 5 figure

Black Holes, Information Loss and the Measurement Problem

The information loss paradox is often presented as an unavoidable consequence of well-established physics. However, in order for a genuine paradox to ensue, not-trivial assumptions about, e.g., quantum effects on spacetime, are necessary. In this work we will be explicit about these additional, speculative assumptions required. We will also sketch a map of the available routes to tackle the issue, highlighting the, often overlooked, commitments demanded of each alternative. In particular, we will display the strong link between black holes, the issue of information loss and the measurement problem.Comment: 14 pages, 3 figure

Measuring, Predicting and Visualizing Short-Term Change in Word Representation and Usage in VKontakte Social Network

Language in social media is extremely dynamic: new words emerge, trend and disappear, while the meaning of existing words can fluctuate over time. Such dynamics are especially notable during a period of crisis. This work addresses several important tasks of measuring, visualizing and predicting short term text representation shift, i.e. the change in a word's contextual semantics, and contrasting such shift with surface level word dynamics, or concept drift, observed in social media streams. Unlike previous approaches on learning word representations from text, we study the relationship between short-term concept drift and representation shift on a large social media corpus - VKontakte posts in Russian collected during the Russia-Ukraine crisis in 2014-2015. Our novel contributions include quantitative and qualitative approaches to (1) measure short-term representation shift and contrast it with surface level concept drift; (2) build predictive models to forecast short-term shifts in meaning from previous meaning as well as from concept drift; and (3) visualize short-term representation shift for example keywords to demonstrate the practical use of our approach to discover and track meaning of newly emerging terms in social media. We show that short-term representation shift can be accurately predicted up to several weeks in advance. Our unique approach to modeling and visualizing word representation shifts in social media can be used to explore and characterize specific aspects of the streaming corpus during crisis events and potentially improve other downstream classification tasks including real-time event detection

Theorizing Risk and Research: Methodological Constraints and Their Consequences

Conflict, postconflict settings, and other risky research sites are important with wide-ranging policy implications. Microlevel, field-based research lends critical insights to how conflicts work and the mechanisms behind macrolevel correlations that underpin quantitative political science. This article identifies how the risks associated with conflict and postconflict contexts influence researchers’ choices by theorizing the existence of distinct adaptive strategies. Specifically, researchers facing elevated risk generally manage it through three main strategies: outsourcing risk, avoiding risk, and internalizing risk. We argue that these strategies systematically shape and circumscribe outputs. We conclude by discussing how the relationship between risky fieldwork and what we know about conflict is poorly acknowledged. Thinking about how we manage risk should play a larger role in both our preparation for and interpretation of research, particularly in conflict and postconflict contexts

Energy’s Role in the Extraversion (Dis)advantage: How Energy Ties and Task Conflict Help Clarify the Relationship Between Extraversion and Proactive Performance

While academic and practitioner literatures have proposed that extraverts are at an advantage in team-based work, it remains unclear exactly what that advantage might be, how extraverts attain such an advantage, and under which conditions. Theory highlighting the importance of energy in the coordination of team efforts helps to answer these questions. We propose that extraverted individuals are able to develop more energizing relationships with their teammates and as a result are seen as proactively contributing to their team. However, problems in coordination (i.e., team task conflict) can reverse this extraversion advantage. We studied 27 project-based teams at their formation, peak performance, and after disbandment. Results suggest that when team task conflict is low, extraverts energize their teammates and are viewed by others as proactively contributing to the team. However, when team task conflict is high, extraverts develop energizing relationships with fewer of their teammates and are not viewed as proactively contributing to the team. Our findings regarding energizing relationships and team task conflict clarify why extraversion is related to proactive performance and in what way, how, and when extraverts may be at a (dis)advantage in team-based work

Ideology of objectivity in political journalism. Attitudes, values and beliefs around truth as a possible horizon?

Desde un enfoque crítico-discursivo se analizan contenidos automáticos y reflexivos en torno a la “objetividad”, como código estilístico-normativo y dispositivo cultural de contornos míticos, compartido por periodistas y audiencias de la información política. Con base en entrevistas realizadas bajo un enfoque etnográfico entre 2012 y 2014, a profesionales de diferentes medios masivos de Córdoba-Argentina, primero se discuten la auto-percepción de su rol contemporáneo y las condiciones de su vínculo cotidiano con fuentes y acontecimientos. Dado el carácter inter-subjetivo del fenómeno, en un segundo momento se incluye el contraste entre las perspectivas periodísticas y las percepciones de audiencias locales, recopiladas en sesiones experimentales simultáneas. Mediante una estrategia de triangulación analítica, se advierte un significativo vínculo de circularidad entre definiciones profesionales y expectativas de consumo.From a critical-discursive approach, automatic and reflexive contents are analyzed around "objectivity", as a stylistic-normative code and cultural device with mythical contours, shared by journalists and audience of political information. Based on interviews to professionals from different mass media in Córdoba-Argentina (conducted under an ethnographic approach between 2012 and 2014), firstly the self-perception of their contemporary role and the conditions of their daily link with sources and events are discussed. Given the inter-subjective nature of the phenomenon, in a second moment the contrast between the journalistic perspectives and the perceptions of local audiences, gathered in simultaneous experimental sessions, is included. Through an analytical triangulation strategy, a significant circularity link between professional definitions and consumption expectations is noticed.From a critical-discursive approach, automatic and reflexive contents are analyzed around “objectivity”, as a stylistic-normative code and cultural device with mythical contours, shared by journalists and audience of political information. Based on interviews to professionals from different mass media in Córdoba-Argentina — conducted under an ethnographic approach between 2012 and 2014 —, firstly the self-perception of their contemporary role and the conditions of their daily link with sources and events are discussed. Given the inter-subjective nature of the phenomenon, in a second moment the contrast between the journalistic perspectives and the perceptions of local audiences, gathered in simultaneous experimental sessions, is included. Through an analytical triangulation strategy, a significant circularity link between professional definitions and consumption expectations is noticed.Fil: Paz Garcia, Ana Pamela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Instituto de Investigaciones Psicológicas (IIPsi), CONICET - Facultad de Psicología, Universidad Nacional de Córdoba; Argentin