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    Patterns of brain activity in choice or instructed go and no-go tasks
    (Springer Science and Business Media LLC, 2025-02-21)
    Sanaz Attaripour Isfahani
    ;
    Patrick McGurrin
    ;
    VIAL UNDURRAGA, FELIPE AGUSTIN  
    ;
    Mark Hallett
    The goal of this study was to investigate the decision making process for choosing what movements to make. We used electroencephalography (EEG) to investigate patterns of the contingent negative variation (CNV) associated with free-choice decisions to move or abstain, comparing them to conditions where actions were commanded. Our primary hypothesis was that choice tasks would differ significantly from each other and exhibit EEG patterns akin to their command-driven counterparts after the decisions were made, at least, in the 50 ms block of time prior to movement. A secondary analysis evaluated post hoc comparisons of time, in 50 ms blocks, to understand the temporal development of the CNV for each condition. We also conducted an exploratory analysis of EEG event-related desynchronization (ERD) to identify patterns of brain activity associated with the decision-making process. This approach was taken due to the exploratory nature of our hypotheses concerning the spatial and temporal characteristics of EEG activity during these free-choice versus commanded tasks. We studied 12 right-handed healthy volunteers (7 women, mean age 53 years, range 39–73 years) with no prior history of neurological or major psychiatric illness. A CNV paradigm encompassing commanded and choice tasks was devised, with a 2500 ms interval between S1 and S2, while recording EEG and electromyography (EMG). S1 provided full information about the upcoming task, which was to be executed at the time of S2. We assessed CNV and explored whole scalp EEG activity, including both voltage as well as power in the alpha and beta frequency ranges. Clear and similar CNVs were observed for command and choice go tasks prior to the movements, contrasting with near-zero CNVs for the command and choice no-go tasks. Separation of CNVs for command go and no-go tasks occurred around 1600 ms post-S1, and choice CNVs separated about 2150 ms post-S1. Exploratory analysis revealed that beta power provided information about decision and preparation processes much earlier. The left dorsolateral prefrontal cortex (DLPFC) exhibited the initial sign of decision approximately 500 ms post-S1 for all tasks, with subsequent preparation for movement or restraint involving distinct activity in various brain regions. The localization of effects in the left DLPFC was determined by visual analysis of the informative electrode sites. The CNVs separate about 2 s after S1, and it appears that this process represents preparation for movement (or no movement). Exploration of the beta activity suggests an earlier decision process which leads eventually to subsequent task preparation and activation. Choice decisions lag slightly behind command decisions, with the CNV apparently reflecting motor implementation rather than the decision-making process. In a simple motor task with an exploratory analysis, both commanded and choice-based decisions are rapidly initiated in the left DLPFC. While the CNV distinguishes between go and no-go conditions, it primarily appears to signify preparation for implementation of the task following the earlier decision. Further controlled studies will be needed to confirm these results.
    Scopus© Citations 3  1
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    Exploring the characteristics of cancer-centred civil society organisations in Chile: A qualitative study
    (Public Library of Science (PLoS), 2025-05-16)
    Antonia Roberts
    ;
    Francisca Vezzani
    ;
    CABIESES VALDES, BALTICA BEATRIZ  
    ;
    OBACH KING, ALEXANDRA ALICE  
    ;
    CAMPAÑA, CARLA  
    In Chile, civil society organisations in health have been historically active in population health and specifically in cancer; they have had an important role in addressing patients’ and families’ necessities. Although they occupy a central role, there is no clarity about who they are, how they are organised, the goals that guide their performance and how they materialize social participation in health. Based on that, this study aimed to explore the characteristics of civil society organisations that work in cancer in Chile and to identify the networks they build with other actors to achieve their goals. Materials and methods Qualitative case study using semi-structured online interviews with organisation representatives, politicians, decision-makers and academics related to cancer in Chile. Content analysis was performed, admitting emerging categories from the participants’ narratives.</jats:p> Results Three main profiles of organisations were identified: (i) Long-established organisations focused on influencing public policy and decision-making in cancer, (ii) Growing organisations focused on informing and supporting families and patients, (iii) Newly established organisations focused on patient well-being, such as sports activities. Relationships between groups and other actors involve perceived benefits like the growth of the organisations and funding for activities. However, perceived barriers and inequities are also identified, mainly lack of financial resources, competition between organisations and insufficient information. Discussion The objectives of civil society organisations in cancer are diverse and reflect multiple ways of practising social participation in health. Tensions generate unequal participation and missed opportunities to promote public health in cancer in Chile. The study highlights the importance of recognising cancer social organisations as essential actors in public health. It is crucial to involve them in formulating and implementing comprehensive responses to maximise the opportunities for progress in this field.
      4
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    Social cues for experimenter incompetence influence choice blindness
    (Elsevier BV, 2025-07)
    Nicolás Marchant
    ;
    Gorka Navarrete
    ;
    Vincent de Gardelle
    ;
    SILVA CONCHA, JAIME  
    ;
    Jérôme Sackur
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    Mapping employment dynamics in public agencies with payroll data: A methodological framework with an application to Chile
    (Public Library of Science (PLoS), 2024-12-31)
    HERRERA MARÍN, MAURICIO RENÉ  
    ;
    Daniel Brieba
    ;
    Floris Vermeulen
    <jats:p>This study introduces a novel, replicable methodology for analyzing employment dynamics within public sector agencies, focusing on turnover and staff longevity. The methodology is designed to be generalizable and applicable to diverse national contexts where detailed administrative data is available. Using payroll data from over 325,000 Chilean civil servants (2006—2020), we apply mixed-effects Cox survival models and linear mixed models to examine patterns of employment stability across state agencies. By incorporating Propensity Score Matching, we further enhance the causal interpretation of turnover changes, especially in post-election years. Finally, we introduce two key metrics—Service Frailty and Relative Turnover Difference—to quantify long-term stability and short-term, post-electoral disruptions. Our findings highlight substantial differences in turnover patterns between regular and post-election years, as well as significant inter-agency heterogeneity in turnover and employee longevity, largely driven by latent agency characteristics. While major covariates like contract type and staff rank account for some variation, much of the disparity stems from agency-specific factors. This framework offers precise, cross-nationally comparable benchmarks for understanding public sector employment dynamics. Additionally, the methodology contributes to the literature by providing transparent and scalable tools for analyzing workforce stability across different contexts.</jats:p>
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    ROSA: An Andean Network of Social–Ecological Observatories
    (International Mountain Society (IMS) and United Nations University, 2024-11-07)
    Julieta Carilla
    ;
    Ricardo Grau
    ;
    Oriana Osinaga Acosta
    ;
    Agustina Malizia
    ;
    Sergio Ceballos
    Scopus© Citations 1  8
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    Socio-Hydrological Agent-Based Modeling as a Framework for Analyzing Conflicts Within Water User Organizations
    (2024)
    Mario Lillo-Saavedra
    ;
    Pablo Velásquez-Cisterna
    ;
    Ángel García-Pedrero
    ;
    Marcela Salgado-Vargas
    ;
    RIVERA SALAZAR, DIEGO ANDRÉS  
    Water resource management in agriculture faces complex challenges due to increasing scarcity, exacerbated by climate change, and the intensification of conflicts among various user groups. This study addresses the issue of predicting and managing these conflicts in the Longaví River Basin, Chile, by considering the intricate interactions between hydrological, social, and economic factors. A socio-hydrological agent-based model (SHABM) was developed, integrating hydrological, economic, and behavioral data. The methodology combined fieldwork with computational modeling, characterizing three types of agents (selfish, neutral, and cooperative) and simulating scenarios with varying levels of water availability and oversight across three water user organizations (WUOs). The key findings revealed that (1) selfish agents are more likely to disregard irrigation schedules under conditions of scarcity and low supervision; (2) high supervision (90%) significantly reduces conflicts; (3) water scarcity exacerbates non-cooperative behaviors; (4) high-risk conflict areas can be identified; and (5) behavioral patterns stabilize after the third year of simulation. This work demonstrates the potential of SHABM as a decision-making tool in water management, enabling the proactive identification of conflict-prone areas and the evaluation of management strategies.
      7Scopus© Citations 5
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      8Scopus© Citations 44
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      2
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    Initial Validation of an Analytical Tool to Support Decision-making on Chronic Illness Management
    (2013)
    Claudia Bustamante
    ;
    Claudia Alcayaga
    ;
    PÉREZ EWERT, JANET CAROLA  
    ;
    Solange Campos
    <jats:p>Introducción: el apoyo a la toma de decisiones en salud facilita el automanejo de personas con enfermedades crónicas (EC). Ob- jetivo: validar la versión en español del DSAT-cdm: herramienta de análisis del apoyo en las decisiones para el manejo de EC, desa- rrollada por Stacey (2006). Materiales y métodos: estudio descriptivo que aplica un proceso sistemático que considera, entre otros: traducción-contratraducción, desarrollo de escenarios de simulación, entrenamiento de evaluadores, entrenamiento pacientes simulados y capacitación para participantes. Muestra: 15 profesionales y 2 jueces, obteniéndose 60 DSAT-cdm versión español aplicado (pre y pos capacitación). Resultados: el instrumento presentó confiabilidad aceptable en la aplicación entre-jueces y detectó la mejora en la calidad del apoyo a la toma de decisiones en los profesionales. Sin embargo, no se obtuvieron resultados que aportaran a la validez de criterio concurrente. Conclusiones: este estudio es la primera evaluación del DSAT-cdm en idioma español, el resultado principal indica que se detecta un cambio en el desempeño de profesionales para apoyar el proceso de toma de decisiones de sus pacientes y, a pesar estos hallazgos favorables, es necesario seguir evaluando el instrumento.</jats:p>
      2
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    Another in need enhances prosociality and modulates frontal theta oscillations in young adults
    (2023)
    Claudio Lavín
    ;
    SOTO ICAZA, PATRICIA  
    ;
    Vladimir López
    ;
    BILLEKE BOBADILLA, PABLO ERNESTO  
    Decision-making is a process that can be strongly affected by social factors. Evidence has shown how people deviate from traditional rational-choice predictions under different levels of social interactions. The emergence of prosocial decision-making, defined as any action that is addressed to benefit another individual even at the expense of personal benefits, has been reported as an example of such social influence. Furthermore, brain evidence has shown the involvement of structures such as the prefrontal cortex, anterior insula, and midcingulate cortex during decision settings in which a decision maker interacts with others under physical pain or distress or while being observed by others.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>Using a slightly modified version of the dictator game and EEG recordings, we tested the hypothesis that the inclusion of another person into the decision setting increases prosocial decisions in young adults and that this increase is higher when the other person is associated with others in need. At the brain level, we hypothesized that the increase in prosocial decisions correlates with frontal theta activity.</jats:p></jats:sec><jats:sec><jats:title>Results and Discussion</jats:title><jats:p>The results showed that including another person in the decision, setting increased prosocial behavior only when this presence was associated with someone in need. This effect was associated with an increase in frontocentral theta-oscillatory activity. These results suggest that the presence of someone in need enhances empathy concerns and norm compliance, raising the participants’ prosocial decision-making.
    Scopus© Citations 8  1