Min, Byoung-Kyong and Busch, Niko A. and Debener, Stefan and Kranczioch, Cornelia and Hanslmayr, Simon and Engel, Andreas K. and Herrmann, Christoph S. (2007) The best of both worlds: Phase-reset of human EEG alpha activity and additive power contribute to ERP generation. INTERNATIONAL JOURNAL OF PSYCHOPHYSIOLOGY, 65 (1). pp. 58-68. ISSN 0167-8760, 1872-7697
Full text not available from this repository. (Request a copy)Abstract
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 eventre-lated 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. (C) 2007 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EVENT-RELATED POTENTIALS; WORKING-MEMORY TASK; THETA-OSCILLATIONS; ELECTROPHYSIOLOGICAL CORRELATE; SYNCHRONIZATION ERS; EVOKED-RESPONSE; BRAIN DYNAMICS; BAND POWER; PERFORMANCE; AMPLITUDE; additive power; alpha activity; EEG; EPP; phase-resetting |
| Subjects: | 100 Philosophy & psychology > 150 Psychology |
| Divisions: | Human Sciences > Institut für Psychologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Dec 2020 11:59 |
| Last Modified: | 02 Dec 2020 11:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32547 |
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