Abstract
Hippocampal oscillations, particularly theta (5–10 Hz) and gamma (30–90 Hz) bands, play important roles in several cognitive functions. Theta and gamma oscillations show cross-frequency coupling (CFC), and the theta rhythm phase can modulate the amplitude of gamma oscillations. This phase–amplitude modulation is believed to have several cognitive roles. Previous studies found that the strength of CFC is correlated with task performance during learning. To explore this correlation in more detail, we recorded local field potentials from the hippocampus of rats while they were performing a rule-switching task. Our preliminary data suggested that the coupling between theta and high-gamma oscillations changed through the learning stages, but the coupling between theta and low-gamma oscillations did not show these changes. These results suggest that high-gamma and low-gamma oscillations play different roles in rule switching.
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