Title Multiple evoked and induced alpha modulations in a visual attention task: Latency, amplitude and topographical profiles
Authors Vázquez-Marrufo M., García-Valdecasas M., Caballero-Diaz R., Martin-Clemente R., GALVAO CARMONA, ALEJANDRO, GALVAO CARMONA, ALEJANDRO
External publication No
Means PLoS ONE
Scope Article
Nature Científica
JCR Quartile 2
SJR Quartile 1
JCR Impact 2.74000
Area International
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-85072661638&doi=10.1371%2fjournal.pone.0223055&partnerID=40&md5=9fe5bb4e3497a0c7ce3d699660e6ef14
Publication date 01/01/2019
ISI 000532345500061
Scopus Id 2-s2.0-85072661638
DOI 10.1371/journal.pone.0223055
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. © 2019 Vázquez-Marrufo et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Keywords adult; article; clinical article; controlled study; correlation analysis; electroencephalogram; evoked response; female; human; human experiment; male; visual attention
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