Search Results for « tACS »

Desde una perspectiva creativa en el ámbito educativo, a la par de la era digital, es preciso fomentar el uso de las Tecnologías del Aprendizaje y del Conocimiento, TACS en el desarrollo de las destrezas lectoras, a través de la innovación de los procesos de aula y el descubrimiento de los beneficios que brindan las herramientas mediadas por la tecnología. El objetivo de la investigación fue identificar el uso de las TACS en el desarrollo de destrezas lectoras en los estudiantes del nivel elemental del Distrito 13D12 del cantón Tosagua, Ecuador; desde un enfoque cualitativo, de tipo exploratorio y descriptivo. La técnica utilizada fue la observación participante para valorar el desarrollo de destrezas en el escenario investigativo escogido en dos momentos; en el primero se aplicó un ejercicio de comprensión lectora de manera tradicional y un segundo momento utilizando las TACS. Los principales resultados determinan que el uso de las TACS incide favorablemente en el desarrollo de destrezas lectoras de una manera innovadora y atractiva para los educandos, permitiendo al docente potenciar la escucha activa y parafraseo. De esta manera se concluye que, al involucrar en el aula los recursos tecnológicos, digitales, los estudiantes desarrollan habilidades cognitivas relacionadas a la lectura.

Non-invasive approaches to modulate oscillatory activity in the brain are increasingly popular in the scientific community. Transcranial alternating current stimulation (tACS) has been shown to modulate neural oscillations in a frequency-specific manner. However, due to a massive stimulation artifact at the targeted frequency, little is known about effects of tACS during stimulation. It remains unclear how the continuous application of tACS affects event-related oscillations during cognitive tasks. Depending on whether tACS influences pre- or post-stimulus oscillations, or both, the endogenous, event-related oscillatory dynamics could be pushed in various directions or not at all. A better understanding of these effects is crucial to plan, predict, and understand outcomes of solely behavioral tACS experiments. In the present study, a recently proposed procedure to suppress tACS artifacts by projecting MEG data into source-space using spatial filtering was utilized to recover event-related power modulations in the alpha-band during a mental rotation task. MEG data of 25 human subjects was continuously recorded. After 10-minute baseline measurement, participants received either 20 minutes of tACS at their individual alpha frequency or sham stimulation. Another 40 minutes of MEG data were acquired thereafter. Data were projected into source-space and carefully examined for residual artifacts. Results revealed strong facilitation of event-related power modulations in the alpha-band during tACS application. These results provide first direct evidence that tACS does not counteract top-down suppression of intrinsic oscillations, but rather enhances pre-existent power modulations within the range of the individual alpha (= stimulation) frequency.