Facultad de Gobierno
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“It's not the what but (also) the how”: characterizing left-wing populism in political texts

2024 , RAVEAU MORALES, MARÍA PAZ , Claudio Fuentes-Bravo , FERNÁNDEZ PLAZA, MIGUEL ÁNGEL , COUYOUMDJIAN NETTLE, JUAN PABLO , DEL SOLAR ZAÑARTU, MARIA JOSE

Despite all the elasticity and even ambiguity surrounding the concept of populism, the existing paradigms converge in the recognition of a populist rhetoric. By using Natural Language Processing (NLP) tools we propose a set of linguistic and discursive markers to identify populist markers in Presidential speeches. The performance of these markers is subsequently tested against the Global Populism Database (GPD). We set-up a multinomial regression model to study the predictive power of these markers on the GPD populist score, focusing on left-wing populist leaders in Spanish-speaking countries in Latin America. We are thus able to characterize (left-wing) populism as a style of communication, as well as to understand what is behind this rhetoric. Our results show that ingroup and emotional content are more present in populist speeches. We also find a positive relation between populism and the use future tense and conditional connectors, which suggest an intention to manipulate the audience. These results have implications both for the current understanding of (left-wing) populist rhetoric and for the conceptualization of populism itself.

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Patients recovering from COVID-19 who presented with anosmia during their acute episode have behavioral, functional, and structural brain alterations

2024 , Leonie Kausel , Alejandra Figueroa-Vargas , José Zamorano-abramson , STECHER GUZMAN, XIMENA PATRICIA , Mauricio Aspé-Sánchez , Patricio Carvajal-Paredes , Victor Márquez-Rodríguez , María Paz Martínez-Molina , Claudio Román , Patricio Soto-Fernández , Gabriela Valdebenito-Oyarzo , Carla Manterola , Reinaldo Uribe-San-Martín , SILVA FUENTE ALBA, CLAUDIO SERGIO , Rodrigo Henríquez-Ch , Francisco Aboitiz , Rafael Polania , Pamela Guevara , MUÑOZ VENTURELLI, PAULA ANDREA , SOTO ICAZA, PATRICIA , BILLEKE BOBADILLA, PABLO ERNESTO

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Theta and alpha oscillations may underlie improved attention and working memory in musically trained children

2024 , Leonie Kausel , F. Zamorano , BILLEKE BOBADILLA, PABLO ERNESTO , M. E. Sutherland , M. I. Alliende , LARRAÍN VALENZUELA, MARÍA JOSEFINA , SOTO ICAZA, PATRICIA , F. Aboitiz

AbstractIntroduction: Attention and working memory are key cognitive functions that allow us to select and maintain information in our mind for a short time, being essential for our daily life and, in particular, for learning and academic performance. It has been shown that musical training can improve working memory performance, but it is still unclear if and how the neural mechanisms of working memory and particularly attention are implicated in this process. In this work, we aimed to identify the oscillatory signature of bimodal attention and working memory that contributes to improved working memory in musically trained children.Materials and methods: We recruited children with and without musical training and asked them to complete a bimodal (auditory/visual) attention and working memory task, whereas their brain activity was measured using electroencephalography. Behavioral, time–frequency, and source reconstruction analyses were made.Results: Results showed that, overall, musically trained children performed better on the task than children without musical training. When comparing musically trained children with children without musical training, we found modulations in the alpha band pre‐stimuli onset and the beginning of stimuli onset in the frontal and parietal regions. These correlated with correct responses to the attended modality. Moreover, during the end phase of stimuli presentation, we found modulations correlating with correct responses independent of attention condition in the theta and alpha bands, in the left frontal and right parietal regions.Conclusions: These results suggest that musically trained children have improved neuronal mechanisms for both attention allocation and memory encoding. Our results can be important for developing interventions for people with attention and working memory difficulties.

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The role of exogenous testosterone and social environment on the expression of sociosexuality and status-seeking behaviors in young Chilean men

2024 , POLO RODRIGO, PABLO , FAJARDO RODRÍGUEZ, GABRIELA PAZ , MUÑOZ REYES, JOSÉ ANTONIO , VALENZUELA MARTÍNEZ, NOHELIA , BELINCHÓN, MONTSERRAT , FIGUEROA VALDEBENITO, ORIANA CRISTINA , Ana Fernández-Martínez , Marcel Deglín , Miguel Pita

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Quantitative evaluation of a theoretical-conceptual model based on affective and socio-behavioral dimensions to explain the academic performance of mathematics students

2024 , Felipe Marín-Álvarez , Luis Flores-Prado , FIGUEROA VALDEBENITO, ORIANA CRISTINA , POLO RODRIGO, PABLO , VARELA TORRES, JORGE JAVIER , MUÑOZ REYES, JOSÉ ANTONIO

ObjectiveThere is evidence that suggests that affective dimensions, personality traits, as well as students’ cooperative interpersonal interactions, are an important element in the students learning process. In this work we propose a theoretical model, based on evidence, that shows the direct and indirect relationships between these factors and academic performance in mathematics courses, in undergraduate and school students.MethodsTo understand the type of relationships between these variables, the PANAS psychometric test of positive and negative affect, the BIG FIVE personality test and the economic decision game DUPLES GAME were applied. The study sample was 130 students between 17 and 22 years of age from undergraduate and school (M ± SD = 20.1 ± 3.99).ResultsFrom a path analysis, statistically significant relationships were found, for example, a direct relationship between neuroticism and positive affect, which in turn is related to academic performance. We also found a direct relationship between neuroticism and negative affect, extraversion and positive affect. This allows us to propose that some of the independent variables of the model directly and indirectly influence the academic performance of students in the subject of mathematics.ConclusionPositive affect and negative affect directly affect academic performance in mathematics, neuroticism has a direct impact on negative affect and extraversion direct impact on positive affect. Consequently, there are direct and indirect relationships between personality traits and affective dimensions, which affect the academic performance of mathematics students.

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The effect of a cognitive training therapy based on stimulation of brain oscillations in patients with mild cognitive impairment in a Chilean sample: study protocol for a phase IIb, 2 × 3 mixed factorial, double-blind randomised controlled trial

2024 , Alejandra Figueroa-Vargas , Begoña Góngora , María Francisca Alonso , Alonso Ortega , Patricio Soto-Fernández , Lucía Z-Rivera , Sebastián Ramírez , Francisca González , MUÑOZ VENTURELLI, PAULA ANDREA , BILLEKE BOBADILLA, PABLO ERNESTO

Abstract Background The ageing population has increased the prevalence of disabling and high-cost diseases, such as dementia and mild cognitive impairment (MCI). The latter can be considered a prodromal phase of some dementias and a critical stage for interventions to postpone the impairment of functionality. Working memory (WM) is a pivotal cognitive function, representing the fundamental element of executive functions. This project proposes an intervention protocol to enhance WM in these users, combining cognitive training with transcranial electrical stimulation of alternating current (tACS). This technique has been suggested to enhance the neuronal plasticity needed for cognitive processes involving oscillatory patterns. WM stands to benefit significantly from this approach, given its well-defined electrophysiological oscillations. Therefore, tACS could potentially boost WM in patients with neurodegenerative diseases. Methods This study is a phase IIb randomised, double-blind clinical trial with a 3-month follow-up period. The study participants will be 62 participants diagnosed with MCI, aged over 60, from Valparaíso, Chile. Participants will receive an intervention combining twelve cognitive training sessions with tACS. Participants will receive either tACS or placebo stimulation in eight out of twelve training sessions. Sessions will occur twice weekly over 6 weeks. The primary outcomes will be electroencephalographic measurements through the prefrontal theta oscillatory activity, while the secondary effects will be cognitive assessments of WM. The participants will be evaluated before, immediately after, and 3 months after the end of the intervention. Discussion The outcomes of this trial will add empirical evidence about the benefits and feasibility of an intervention that combines cognitive training with non-invasive brain stimulation. The objective is to contribute tools for optimal cognitive treatment in patients with MCI. To enhance WM capacity, postpone the impairment of functionality, and obtain a better quality of life. Trial registration ClinicalTrials.gov NCT05291208. Registered on 28 February 2022. ISRCTN87597719 retrospectively registered on 15 September 2023.

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A mathematical model of semantic access in lexical and semantic decisions

2024 , Sergio E. Chaigneau , Nicolás Marchant , Enrique Canessa , Nerea Aldunate

In this work, we use a mathematical model of the property listing task dynamics and test its ability to predict processing time in semantic and lexical decision tasks. The study aims at exploring the temporal dynamics of semantic access in these tasks and showing that the mathematical model captures essential aspects of semantic access, beyond the original task for which it was developed. In two studies using the semantic and lexical decision tasks, we used the mathematical model’s coefficients to predict reaction times. Results showed that the model was able to predict processing time in both tasks, accounting for an independent portion of the total variance, relative to variance predicted by traditional psycholinguistic variables (i.e., frequency, familiarity, concreteness imageability). Overall, this study provides evidence of the mathematical model’s validity and generality, and offers insights regarding the characterization of concrete and abstract words.

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Overcoming Health Inequities: Spatial Analysis of Seroprevalence and Vaccination Against COVID-19 in Chile

2024 , Muriel Ramírez-Santana , Juan Correa , Loreto Núñez Franz , APABLAZA SALINAS, MAURICIO IVÁN , RUBILAR RAMIREZ, PAOLA ANDREA , VIAL COX, MARIA CECILIA , CORTES SALINAS, LINA JIMENA , HORMAZABAL CASTILLO, JUAN PATRICIO , Luis Canales , VIAL CLARO, PABLO AGUSTIN , AGUILERA SANHUEZA, XIMENA PAZ

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Oscillatory activity underlying cognitive performance in children and adolescents with autism: a systematic review

2024 , SOTO ICAZA, PATRICIA , Patricio Soto-Fernández , Leonie Kausel , MÁRQUEZ RODRÍGUEZ, VÍCTOR JULIO , Patricio Carvajal-Paredes , María Paz Martínez-Molina , Alejandra Figueroa-Vargas , BILLEKE BOBADILLA, PABLO ERNESTO

Autism spectrum disorder (ASD) is a neurodevelopmental condition that exhibits a widely heterogeneous range of social and cognitive symptoms. This feature has challenged a broad comprehension of this neurodevelopmental disorder and therapeutic efforts to address its difficulties. Current therapeutic strategies have focused primarily on treating behavioral symptoms rather than on brain psychophysiology. During the past years, the emergence of non-invasive brain stimulation techniques (NIBS) has opened alternatives to the design of potential combined treatments focused on the neurophysiopathology of neuropsychiatric disorders like ASD. Such interventions require identifying the key brain mechanisms underlying the symptomatology and cognitive features. Evidence has shown alterations in oscillatory features of the neural ensembles associated with cognitive functions in ASD. In this line, we elaborated a systematic revision of the evidence of alterations in brain oscillations that underlie key cognitive processes that have been shown to be affected in ASD during childhood and adolescence, namely, social cognition, attention, working memory, inhibitory control, and cognitive flexibility. This knowledge could contribute to developing therapies based on NIBS to improve these processes in populations with ASD.

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Gallbladder cancer mortality in Chile: has the government program targeting young gallstone patients had an impact?

2024 , Vicente Cid , Claudio Vargas , DELGADO BECERRA, OROZIMBA IRIS , APABLAZA SALINAS, MAURICIO IVÁN , Meredith S Shiels , Allan Hildesheim , Jill Koshiol , Catterina Ferreccio

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