Artículo
Effect of the side of presentation in the visual field on phase‑locked and nonphase‑locked alpha and gamma responses
Autor/es | Sarrias Arrabal, Esteban
Martín Clemente, Rubén ![]() ![]() ![]() ![]() ![]() ![]() ![]() Galvao Carmona, Alejandro Benítez Lugo, María Luisa ![]() ![]() ![]() ![]() ![]() ![]() ![]() Vázquez Marrufo, Manuel ![]() ![]() ![]() ![]() ![]() ![]() |
Departamento | Universidad de Sevilla. Departamento de Teoría de la Señal y Comunicaciones Universidad de Sevilla. Departamento de Fisioterapia Universidad de Sevilla. Departamento de Psicología Experimental |
Fecha de publicación | 2022 |
Fecha de depósito | 2023-11-27 |
Publicado en |
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Resumen | Recent studies have suggested that nonphase-locked activity can reveal cognitive mechanisms that cannot be observed in phase-locked activity. In fact, we describe a concomitant decrease in nonphase-locked alpha activity ... Recent studies have suggested that nonphase-locked activity can reveal cognitive mechanisms that cannot be observed in phase-locked activity. In fact, we describe a concomitant decrease in nonphase-locked alpha activity (desynchronization) when stimuli were processed (alpha phase-locked modulation). This desynchronization may represent a reduction in “background activity” in the visual cortex that facilitates stimulus processing. Alternatively, nonphase-locked gamma activity has been hypothesized to be an index of shifts in attentional focus. In this study, our main aim was to confirm these potential roles for nonphase-locked alpha and gamma activities with a lateralized Go/NoGo paradigm. The results showed that nonphase-locked alpha modulation is bilaterally represented in the scalp compared to the contralateral distribution of the phase-locked response. This finding suggests that the decrease in background activity is not limited to neural areas directly involved in the visual processing of stimuli. Additionally, gamma activity showed a higher desynchronization of nonphase-locked activity in the ipsilateral hemisphere, where the phase-locked activity reached the minimum amplitude. This finding suggests that the possible functions of nonphase-locked gamma activity extend beyond shifts in attentional focus and could represent an attentional filter reducing the gamma representation in the visual area irrelevant to the task. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | PSI2016-78133-P
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Cita | Sarrias Arrabal, E., Martín Clemente, R., Galvao Carmona, A., Benítez Lugo, M.L. y Vázquez Marrufo, M. (2022). Effect of the side of presentation in the visual field on phase‑locked and nonphase‑locked alpha and gamma responses. Scientific Reports, 12, 13200. https://doi.org/10.1038/s41598-022-15936-7. |
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