Multiple evoked and induced alpha modulations in a visual attention task: Latency, amplitude and topographical profiles.

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ID: 55973
2019
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Abstract
Alpha event-related desynchronization (ERD) has been widely applied to understand the psychophysiological role of this band in cognition. In particular, a considerable number of publications have described spectral alterations in several pathologies using this time-frequency approach. However, ERD is not capable of specifically showing nonphase (induced) activity related to the presentation of stimuli. Recent studies have described an evoked and induced activity in the early phases (first 200 ms) of stimulus processing. However, scarce studies have analyzed induced and evoked modulations in longer latencies (>200 ms) and their potential roles in cognitive processing. The main goal of the present study was to analyze diverse evoked and induced modulations in response to visual stimuli. Thus, 58-channel electroencephalogram (EEG) was recorded in 21 healthy subjects during the performance of a visual attention task, and analyses were performed for both target and standard stimuli. The initial result showed that phase-locked and nonphase locked activities coexist in the early processing of target and standard stimuli as has been reported by previous studies. However, more modulations were evident in longer latencies in both evoked and induced activities. Correlation analyses suggest that similar maps were present for evoked and induced activities at different timepoints. In the discussion section, diverse proposals will be stated to define the potential roles of these modulations in the information processing for this cognitive task. As a general conclusion, induced activity enables the observation of cognitive mechanisms that are not visible by ERD or ERP modulations.
Reference Key
vzquezmarrufo2019multipleplos Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Vázquez-Marrufo, Manuel;García-Valdecasas, Macarena;Caballero-Diaz, Rocío;Martin-Clemente, Ruben;Galvao-Carmona, Alejandro;
Journal PloS one
Year 2019
DOI
10.1371/journal.pone.0223055
URL
Keywords
augmented reality signal processing ambient assisted living (aal) computing devices educational technologies

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