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  • Title: Phase-locked alpha and theta oscillations generate the P1-N1 complex and are related to memory performance.
    Author: Klimesch W, Schack B, Schabus M, Doppelmayr M, Gruber W, Sauseng P.
    Journal: Brain Res Cogn Brain Res; 2004 May; 19(3):302-16. PubMed ID: 15062867.
    Abstract:
    An oscillatory phase resetting model is presented and data are reported which indicate that early components of the event-related potential are due to the superposition of evoked oscillations. The following hypotheses were tested and could be confirmed: (i) theta and alpha show a significant increase in phase locking during the time window of the P1 and N1 as compared to a prestimulus reference, (ii) the dynamics of event-related changes in evoked theta and alpha power obey the same principles as are known from event-related de-/synchronization research, and (iii) latency measures of the P1-N1 complex are negatively correlated with individual alpha frequency. In addition, we have found that theta phase locking is larger during encoding than recognition and that good memory performers show a larger increase in theta and alpha phase locking during recognition in the time window of the N1. Our general conclusion is that the P1-N1 complex is generated primarily by evoked alpha and theta oscillations reflecting the synchronous activation of a working- and semantic memory system.
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