Abstract:
:Since years there is a hotly discussed dispute whether event-related potentials are either generated by an evoked component or by resetting of ongoing phase. We argue that phase-reset must not be proven in order to accept the general involvement of phase in ERP-generation as it is only one of several possible mechanisms influencing or generating certain ERP-components. Supporting data are presented showing that positive peaks of ongoing pre-stimulus alpha activity are not randomly distributed in time across trials. Most importantly, we found that a certain kind of pre-stimulus phase concentration that represents a continuous development of an alpha wave up to the time window where the P1 is generated is associated with an enlarged event-related component. We conclude that ongoing oscillations cannot be considered random background noise (even before stimulus onset) and that there are probably more phase-mechanisms that can contribute to the ERP-generation.
journal_name
Brain Res Bulljournal_title
Brain research bulletinauthors
Fellinger R,Klimesch W,Gruber W,Freunberger R,Doppelmayr Mdoi
10.1016/j.brainresbull.2011.03.025subject
Has Abstractpub_date
2011-07-15 00:00:00pages
417-23issue
6eissn
0361-9230issn
1873-2747pii
S0361-9230(11)00133-Xjournal_volume
85pub_type
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