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Theta and gamma EEG synchronization associated with memory and language processes

INTRODUCTION In the past years interest in human brain oscillations and their possible role in higher cognitive processes has greatly increased. The two oscillations that have received the most attention in memory and language research are the theta and the gamma rhythm [e.g., 1, 2, 4]. This paper presents two studies demonstrating the importance of frequency-related neuronal coupling within and among these rhythms investigated by means of analysis of EEG coherence, and 1:1 and n:m phase synchronization.