![]() ![]() ![]() It is derived by averaging the poststimulus electroencephalogram (EEG) over a sufficient number of trials. The event-related potential (ERP) is one of the most frequently employed measures of the brain's event-related electrical activity. The prestimulus brain state exerts a prominent influence on event-related brain responses. We conclude that both partial phase-resetting and partial additive power contribute dynamically to the generation of ERPs. 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. Data from this group seems to be in favor of an additive event-related neuronal response without alpha-blocking. In contrast, individuals without observable prestimulus total alpha activity showed a concurrent increase of phase-locked and non-phase-locked alpha activity after stimulation. 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. 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. EEG was recorded from 23 participants performing a visual discrimination task. We investigated the relationship between event-related oscillatory activity in the alpha band and prestimulus levels of ongoing alpha activity on ERPs. ![]() 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. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |