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Repositorio Institucional de la Universidad de Murcia

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  1. Home
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Browsing by Subject "EEG"

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    Efectos del entrenamiento asistido con neurofeedback sobre el EEG, los procesos de función ejecutiva y el estado de ánimo en una muestra de población normal
    (Murcia: Universidad de Murcia, Editum, 2015-01) Vasquez, Milena; Gadea, Marien; Garijo, Evelio; Aliño, Marta; Salvador, Alicia
    El entrenamiento en neurofeedback (NF) consiste en enseñar a los individuos a modificar, regular y potenciar su patrón de actividad cerebral. El objetivo de nuestra investigación fue evaluar el efecto del entrenamiento sobre los procesos cognitivos de función ejecutiva y sobre el estado de ánimo en una muestra de población normal. Se seleccionó una muestra de 30 mujeres estudiantes universitarias, asignadas a tres grupos: HD: hemisferio derecho (n = 10), HI: hemisferio izquierdo (n = 10) y control (n = 10). Se entrenó durante una sola sesión el predominio del patrón beta y la inhibición del patrón theta y se realizó una evaluación pre y post-entrenamiento de la función ejecutiva (Iowa Gambling Test) y del estado de ánimo mediante autoinforme. Se encontró que el entrenamiento en NF produjo cambios positivos significativos en el rendimiento ejecutivo en el grupo HD. En relación con el EEG, se encontró una tendencia al cambio tras el entrenamiento de ondas beta. Se encontraron correlaciones significativas entre el rendimiento ejecutivo, el estado de ánimo negativo, y la banda de frecuencia theta. Se concluye que el protocolo resulta efectivo para potenciar aspectos de la función ejecutiva y que la disminución de ondas theta parece favorecer la disminución del estado de ánimo negativo.
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    Human brain dynamics dissociate early perceptual and late motor‐related stages of affordance processing
    (Wiley, 2024-07-21) Wang, Sheng ; Djebbara, Zakaria ; Sanches de Oliveira, Guilherme; Gramann, Klaus; Filosofía
    Affordances, the opportunities for action offered by the environment to an agent, are vital for meaningful behaviour and exist in every interaction with the environment. There is an ongoing debate in the field about whether the perception of affordances is an automated process. Some studies suggest that affordance perception is an automated process that is independent from the visual context and bodily interaction with the environment, whereas others argue that it is modulated by the visual and motor context in which affordances are perceived. The present paper aims to resolve this debate by examining affordance automaticity from the perspective of sensorimotor time windows. To investigate the impact of different forms of bodily interactions with an environment, that is, the movement context (physical vs. joystick movement), we replicated a previous study on affordance perception in which participants actively moved through differently wide doors in an immersive 3D virtual environment. In the present study, we displayed the same environment on a 2D screen with participants moving through doors of different widths using the keys on a standard keyboard. We compared components of the event-related potential (ERP) from the continuously recorded electroencephalogram (EEG) that were previously reported to be related to affordance perception of architectural transitions (passable and impassable doors). Comparing early sensory and later motor-related ERPs, our study replicated ERPs reflecting early affordance perception but found differences in later motor-related components. These results indicate a shift from automated perception of affordances during early sensorimotor time windows to movement context dependence of affordance perception at later stages, suggesting that affordance perception is a dynamic and flexible process that changes over sensorimotor stages.

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