Power and coherence of cortical high‐frequency oscillations during wakefulness and sleep

• DOI: 10.1111/ejn.13718
• Publication Date: 2017-09-18T15:56:57Z
• Authors: Matías Cavelli; Daniel Rojas‐Líbano; Natalia Schwarzkopf; Santiago Castro‐Z...; Joaquín Gonzalez; Alejandra Mondino; Noelia Santana; Luciana Benedetto; Atilio Falconi; Pablo Torterolo
• Keywords: Neocortex

Abstract Recently, a novel type of fast cortical oscillatory activity that occurs between 110 and 160 Hz (high‐frequency oscillations ( HFO )) was described. are modulated by the theta rhythm in hippocampus neocortex during active wakefulness REM sleep. As theta‐ coupling increases , role for memory consolidation has been proposed. However, global properties such as cortex‐wide topographic distribution cortico‐cortical coherence remain unknown. In this study, we recorded electroencephalogram sleep rat analyzed spatial extent band power coherence. We confirmed amplitude is phase‐locked to modified behavioral states. During wakefulness, relatively higher olfactory bulb compared decreased non‐ had an intermediate level Furthermore, larger than while showed complex pattern which increased only intra inter‐hemispheric combination electrodes. This different from gamma (30–100 Hz) coherence, reduced data show important dialog even when comodulation lower . contrast, highly restricted intra‐hemispheric medial‐posterior regions. Further studies combining behavior, electrophysiology new analytical tools needed plunge deeper into functional significance