Visual P2 component is related to theta phase-locking

• Published in: Neuroscience letters Vol. 426; no. 3; pp. 181 - 186
• Main Authors: Freunberger, R., Klimesch, W., Doppelmayr, M., Höller, Y.
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier Ireland Ltd 22-10-2007; Elsevier
• Subjects: Adult; Biological and medical sciences; Brain - physiology; Evoked Potentials - physiology; Female; Fundamental and applied biological sciences. Psychology; Humans; Male; Oscillations; Phase-locking; PLI; Theta; Theta Rhythm; Total power; Vertebrates: nervous system and sense organs; Oscillations; Total power; Phase-locking; PLI; Theta; Oscillation
• ISSN: 0304-3940; 1872-7972
• DOI: 10.1016/j.neulet.2007.08.062

In this study we investigated the hypothesis whether P2-related differences tested in a visual priming paradigm are associated with theta phase-locking. We recorded the EEG from 31 electrodes and calculated phase-locking index and total power differences for frequencies between 2 and 20
Hz. ERPs (event-related potentials) were analyzed for P1, N1 and P2 components. P2 showed strongest task-related amplitude differences between congruent and incongruent targets. A source analyses was performed for the P2 component using sLoreta that revealed local generators of the P2 in parieto–occipital regions. Phase-locking analyses showed specific effects in the theta range (4–6
Hz) appearing in time windows at around the P2 component. We draw the conclusion that phase-locked theta reflect top-down regulation processes mediating information between memory systems and is in part involved in the modulation of the P2 component.