Artículos Gobierno
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Browsing Artículos Gobierno by Author "Alliende, Luz M."
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Item Attending to the heart is associated with posterior alpha band increase and a reduction in sensitivity to concurrent visual stimuli.(2017) Villena-González, M.; Moënne-Loccoz, C.; Lagos, R.; Alliende, Luz M.; Billeke, Pablo; Aboitiz, Francisco; López, V.; Cosmelli, D.Attentional mechanisms have been studied mostly in specific sensory domains, such as auditory, visuospatial, or tactile modalities. In contrast, attention to internal interoceptive visceral targets has only recently begun to be studied, despite its potential importance in emotion, empathy, and self-awareness. Here, we studied the effects of shifting attention to the heart using a cue-target detection paradigm during continuous EEG recordings. Subjects were instructed to count either a series of visual stimuli (visual condition) or their own heartbeats (heart condition). Visual checkerboard stimuli were used as attentional probes throughout the task. Consistent with previous findings, attention modulated the amplitude of the heartbeat-evoked potentials. Directing attention to the heart significantly reduced the visual P1/N1 amplitude evoked by the attentional probe. ERPs locked to the attention-directing cue revealed a novel frontal positivity around 300 ms postcue. Finally, spectral power in the alpha band over parieto-occipital regions was higher while attending to the heart-when compared to the visual task-and correlated with subject's performance in the interoceptive task. These results are consistent with a shared, resource-based attentional mechanism whereby allocating attention to bodily signals can affect early responses to visual stimuli.Publication Human development, inequality, and their associations with brain structure across 29 countries(2025) Medel, Vicente; Alliende, Luz M.; Bethlehem, Richard; Seidlitz, Jakob; Ringlein, Grace; Arango, Celso; Arnatkevičiūtė, Aurina; Asmal, Laila; Bellgrove, Mark; Benegal, Vivek; Bernardo, Miquel; Billeke, Pablo; Bosch-Bayard, Jorge; Bressan, Rodrigo; Busatto, Geraldo; Castro, Mariana; Chaim-Avancini, Tiffany; Costanzi, Monise; Czepielewski,Leticia; Dazzan, Paola; Fuente-Sandoval, Camilo de la; Diaz-Caneja, Covadonga M.; Forti, Marta Di; Diaz-Zuluaga, Ana Maria; Plessis, Stefan Du; Duran, Fabio; Fittipaldi, Sol; Fornito, Alex; Freimer, Nelson; Gadelha, Ary; Gama, Clarissa; Garani, Ranjini; Garcia-Rizo, Clemente; Gonzalez Campo, Cecilia; Gonzalez-Valderrama, Alfonso; Guinjoan, Salvador; Ivanovic, Daniza; Undurraga, Juan; Zamorano, FranciscoBackground The macro-social and environmental conditions in which people live, such as the level of a country’s development or inequality, are associated with brain-related disorders. However, the relationship between these systemic environmental factors and the brain remains unclear. We aimed to determine the association between the level of development and inequality of a country and the brain structure of healthy adults. Methods We conducted a cross-sectional study pooling brain imaging (T1-based) data from 145 magnetic resonance imaging (MRI) studies in 7,962 healthy adults (4,110 women) in 29 different countries. We used a meta-regression approach to relate the brain structure to the country’s level of development and inequality. Results Higher human development was consistently associated with larger hippocampi and more expanded global cortical surface area, particularly in frontal areas. Increased inequality was most consistently associated with smaller hippocampal volume and thinner cortical thickness across the brain. Conclusions Our results suggest that the macro-economic conditions of a country are reflected in its inhabitants’ brains and may explain the different incidence of brain disorders across the world. The observed variability of brain structure in health across countries should be considered when developing tools in the field of personalized or precision medicine that are intended to be used across the world.