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Cerebral Cortex Advance Access published online on July 21, 2004
Cerebral Cortex, doi:10.1093/cercor/bhh139
© 2004 by Oxford University Press
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Article

Alpha Phase Synchronization Predicts P1 and N1 Latency and Amplitude Size

Walter R. Gruber 1*, Wolfgang Klimesch 1, Paul Sauseng 1, Michael Doppelmayr 1

1 Department of Physiological Psychology, University of Salzburg, Austria

* To whom correspondence should be addressed. E-mail: walter.r.gruber{at}sbg.ac.at.


  Abstract

The oscillatory phase-resetting model predicts that event-related potential (ERP) components are generated by a superposition of evoked oscillations with different frequencies. We investigate this question in a memory task in which human subjects had to retrieve a verbal label in response to the presentation of a picture. The results show that (i) evoked oscillations in the delta, theta, alpha and beta range undergo a significant phase resetting and (ii) become synchronized in absolute phase during small time windows that (iii) coincide with the latencies of the P1-N1 complex. Our conclusion is that the latencies of ERP components can be predicted at least in part by phase synchronization between frequencies.

Keywords: alpha; event-related potential; evoked oscillations; phase synchronization; theta.
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