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Cerebral Cortex Advance Access originally published online on July 21, 2004
Cerebral Cortex 2005 15(4):371-377; doi:10.1093/cercor/bhh139
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Cerebral Cortex V 15 N 4 © Oxford University Press 2004; all rights reserved

Alpha Phase Synchronization Predicts P1 and N1 Latency and Amplitude Size

Walter R. Gruber, Wolfgang Klimesch, Paul Sauseng and Michael Doppelmayr

Department of Physiological Psychology, University of Salzburg, Austria

Address correspondence to Walter Gruber, University of Salzburg, Department of Physiological Psychology, Institute of Psychology, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria. Email: walter.r.gruber{at}sbg.ac.at.

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.

Key Words: alpha • event-related potential • evoked oscillations • phase synchronization • theta


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