Browsing by Author "Ortega, Rodrigo"

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    Allostatic-interoceptive anticipation of social rejection
    (2023) Migeot, Joaquin; Hesse, Eugenia; Fittipaldi, Sol; Mejia, Jhonny; Fraile, Matias; Garcia, Adolfo M.; Garcia, Maria del Carmen; Ortega, Rodrigo; Lawlor, Brian; Lopez, Vladimir; Ibanez, Agustin
    Anticipating social stress evokes strong reactions in the organism, including interoceptive modulations. However, evidence for this claim comes from behavioral studies, often with inconsistent results, and relates almost solely to the reactive and recovery phase of social stress exposure. Here, we adopted an allostatic-interoceptive predictive coding framework to study interoceptive and exteroceptive anticipatory brain responses using a social rejection task. We analyzed the heart -evoked potential (HEP) and task-related oscillatory activity of 58 adolescents via scalp EEG, and 385 human intracranial recordings of three patients with intractable epilepsy. We found that anticipatory interoceptive signals increased in the face of unexpected social outcomes, reflected in larger negative HEP modulations. Such signals emerged from key brain allostatic-interoceptive network hubs, as shown by intracranial recordings. Exteroceptive signals were characterized by early activity between 1-15 Hz across conditions, and modulated by the probabilistic anticipation of reward-related outcomes, observed over distributed brain regions. Our findings suggest that the anticipation of a social outcome is characterized by allostatic-interoceptive modulations that prepare the organism for possible rejection. These results inform our understanding of interoceptive processing and constrain neurobiological models of social stress.
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    Exogenous orienting of visual-spatial attention in ADHD children
    (2013) Ortega, Rodrigo; López Hernández, Vladimir; Carrasco, Ximena; Anllo-Vento, Lourdes; Aboitiz, Francisco
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    From neural signatures of emotional modulation to social cognition : individual differences in healthy volunteers and psychiatric participants
    (2014) Ibáñez, Agustín; Aguado, Jaume; Baez, Sandra; Huepe Artigas, David; López Hernández, Vladimir; Ortega, Rodrigo; Sigman, Mariano; Mikulan, Ezequiel; Lischinsky, Alicia; Torrente, Fernando; Cetkovich, Marcelo; Torralva, Teresa; Bekinschtein, Tristan; Manes, Facundo
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    Temporal dynamics of different levels of feature representation in working memory binding: An EEG and iEEG study
    (2016) Ortega, Rodrigo; López Hernández, Vladimir; Baglivo, Fabricio; Parra, Mario; Ibáñez, Agustín
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    Voluntary modulations of attention in a semantic auditory-visual matching Task: an ERP study
    (SOC BIOLGIA CHILE, 2008) Ortega, Rodrigo; Lopez, Vladimir; Aboitiz, Francisco
    The present study explores the neural correlates of voluntary modulations of attention in an auditory-visual matching task. Visual stimuli (a female or a male face) were preceded in close temporal proximity by auditory stimuli consisting of the Spanish word for "man" and "woman" ("hombre" or "mujer"). In 80% of the trials the gender of the two stimuli coincided. Participants were asked to mentally count the specific instances in which a female face appeared after hearing the word "man" (10 % of the trials). Our results show attention-related amplitude modulation of the early visual ERP components NI and anterior P2, but also amplitude modulations of (i) the N270 potential usually associated with conflict detection, (ii) a P300 wave related to infrequency, and (iii) an N400 potential related to semantic incongruence. The elicitation of these latter components varied according to task manipulations, evidencing the role of voluntary allocation of attention in fine-tuning cognitive processing, which includes basic processes like detection of infrequency or semantic incongruity often considered to be volition-independent.