Examinando por Autor "Fernández-del-Olmo, Miguel A."

Seleccione resultados tecleando las primeras letras
Mostrando 1 - 2 de 2
  • Miniatura
    Ítem
    A novel approach to study the behavioral, neural and phenomenological impact of prefrontal HD-tDCS on conflict resolution
    (PsyArXiv, 2024-09-14) Holgado, Darías; Martínez-Pérez, Víctor; Martín-Arévalo, Elisa; Bekinschtein, Tristán A.; Fernández-del-Olmo, Miguel A.; Sanabria, Daniel; Luque-Casado, Antonio
    This study aimed to investigate the effects of high-definition transcranial direct current stimulation (HD-tDCS) on conflict resolution, focusing on behavioral performance, neural activity, and subjective experience. Sixty participants were randomly assigned to anodal, cathodal, or sham HD-tDCS groups and completed a 30-minute flanker task during stimulation. Using a comprehensive methodological approach, including Drift-Diffusion Modeling (DDM), EEG analysis, Lempel-Ziv complexity, and Temporal Experience Tracing (TET), we assessed the cognitive, neural, and phenomenological effects of stimulation. Behavioral results indicated no significant improvements in reaction times or accuracy across the stimulation groups. Similarly, DDM parameters showed no effect of HD-tDCS on cognitive processes. However, EEG data revealed a significant reduction in neural complexity, in the anodal group during resting-state, suggesting neural reorganization. Subjective experience analysis identified two distinct clusters of task-related feelings, though time spent in these experiential states did not differ between groups. Interestingly, sensation of stimulation was significantly higher for anodal stimulation than sham when analyzed as a single dimension. Despite null behavioral effects, this study provides important insights into the neural and subjective responses to HD-tDCS and emphasizes the value of advanced analytic techniques in examining brain stimulation effects. These findings contribute to the ongoing debate about the efficacy of tDCS in cognitive enhancement.
  • Miniatura
    Ítem
    The impact of prefrontal high-definition transcranial direct current stimulation (HD-tDCS) on conflict resolution and its phenomenological dynamics
    (2023-09) Martínez-Pérez, Víctor; Alameda, Clara; Martín-Arévalo, Elisa; Fuentes, Luis; Bekinschtein, Tristán; Fernández-del-Olmo, Miguel A.; Sanabria, Daniel; Luque-Casado, Antonio
    The effects of applying non-invasive brain stimulation techniques on conflict resolution performance is still an open question. Here we will address this issue by assessing the cognitive and physiological effects of applying anodal and cathodal HD-tDCS over DLPFC on conflict resolution by using a 30' flanker task. Moreover, the effects of the stimulation on phenomenological dynamics over the course of the task will be addressed. In a pre-registered, randomized, sham-controlled, parallel study, we will assign participants to one of the 3 groups of stimulation: anodal, cathodal, sham. A pre-post resting state EEG and the task-related oscillatory activity during the first and last 6' temporal blocks of the task will be measured. Stimulation will be applied online from the second to the fourth block of trials (18'). Right after, participants will be asked to report their temporal experience tracing. Behavioral data will be analyzed by applying a drift diffusion modelling. This novel approach will allow us to get a more thorough understanding of cognitive processes and electrophysiological mechanisms underlying the effects of stimulation on conflict resolution. As far as we know, this will be the most comprehensive work on this topic