TY - JOUR
T1 - The best of both worlds
T2 - Phase-reset of human EEG alpha activity and additive power contribute to ERP generation
AU - Min, Byoung Kyong
AU - Busch, Niko A.
AU - Debener, Stefan
AU - Kranczioch, Cornelia
AU - Hanslmayr, Simon
AU - Engel, Andreas K.
AU - Herrmann, Christoph S.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/7
Y1 - 2007/7
N2 - Some authors have proposed that event-related potentials (ERPs) are generated by a neuronal response which is additive to and independent of ongoing activity, others demonstrated that they are generated by partial phase-resetting of ongoing activity. We investigated the relationship between event-related oscillatory activity in the alpha band and prestimulus levels of ongoing alpha activity on ERPs. EEG was recorded from 23 participants performing a visual discrimination task. Individuals were assigned to one of three groups according to the amount of prestimulus total alpha activity, and distinct differences of the event-related EEG dynamics between groups were observed. While all groups exhibited an event-related increase in phase-locked (evoked) alpha activity, only individuals with sustained prestimulus alpha activity showed alpha-blocking, that is, a considerable decrease of poststimulus non-phase-locked alpha activity. In contrast, individuals without observable prestimulus total alpha activity showed a concurrent increase of phase-locked and non-phase-locked alpha activity after stimulation. Data from this group seems to be in favor of an additive event-related neuronal response without alpha-blocking. However, the dissociable EEG dynamics of total and evoked alpha activities together with a complementary simulation analysis indicated a partial event-related reorganization of ongoing brain activity. We conclude that both partial phase-resetting and partial additive power contribute dynamically to the generation of ERPs. The prestimulus brain state exerts a prominent influence on event-related brain responses.
AB - Some authors have proposed that event-related potentials (ERPs) are generated by a neuronal response which is additive to and independent of ongoing activity, others demonstrated that they are generated by partial phase-resetting of ongoing activity. We investigated the relationship between event-related oscillatory activity in the alpha band and prestimulus levels of ongoing alpha activity on ERPs. EEG was recorded from 23 participants performing a visual discrimination task. Individuals were assigned to one of three groups according to the amount of prestimulus total alpha activity, and distinct differences of the event-related EEG dynamics between groups were observed. While all groups exhibited an event-related increase in phase-locked (evoked) alpha activity, only individuals with sustained prestimulus alpha activity showed alpha-blocking, that is, a considerable decrease of poststimulus non-phase-locked alpha activity. In contrast, individuals without observable prestimulus total alpha activity showed a concurrent increase of phase-locked and non-phase-locked alpha activity after stimulation. Data from this group seems to be in favor of an additive event-related neuronal response without alpha-blocking. However, the dissociable EEG dynamics of total and evoked alpha activities together with a complementary simulation analysis indicated a partial event-related reorganization of ongoing brain activity. We conclude that both partial phase-resetting and partial additive power contribute dynamically to the generation of ERPs. The prestimulus brain state exerts a prominent influence on event-related brain responses.
KW - Additive power
KW - Alpha activity
KW - EEG
KW - ERP
KW - Phase-resetting
UR - http://www.scopus.com/inward/record.url?scp=34347261697&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34347261697&partnerID=8YFLogxK
U2 - 10.1016/j.ijpsycho.2007.03.002
DO - 10.1016/j.ijpsycho.2007.03.002
M3 - Article
C2 - 17428561
AN - SCOPUS:34347261697
VL - 65
SP - 58
EP - 68
JO - International Journal of Psychophysiology
JF - International Journal of Psychophysiology
SN - 0167-8760
IS - 1
ER -