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

Autoři: Manuel Vázquez-Marrufo aff001;  Macarena García-Valdecasas aff001;  Rocío Caballero-Diaz aff001;  Ruben Martin-Clemente aff002;  Alejandro Galvao-Carmona aff003
Působiště autorů: Experimental Psychology Department, Faculty of Psychology, University of Seville, Seville, Spain aff001;  Signal Processing and Communications Department, Higher Technical School of Engineering, University of Seville, Seville, Spain aff002;  Department of Psychology, Loyola Andalucía University, Seville, Spain aff003
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223055


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.

Klíčová slova:

Cognition – Electroencephalography – Event-related potentials – Modulation – Valleys – Vision – Evoked potentials – Information processing


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