Previous studies (Berke et al, SFN 2003, Masimore et al, SFN 2003) identified an approximately 50Hz transient oscillation in local field potentials (LFPs) in rodent striatum . LFPs were recorded from tetrodes chronically implanted in the striatum while rats (n=11) performed sequence-learning, navigation, and operant-conditioning tasks. Interactions between frequencies were calculated via correlation coefficients of Fourier transformed signals. Areas of high correlation indicate that a single process is strongly contributing to those frequencies (Masimore et al., in press, J Neurosci Methods). The tasks were divided into behaviorally significant sections. Different task regions showed strikingly different correlations, with the 50Hz correlation occurring strongly in areas where the animal typically initiated ballistic movements. The 50Hz signal was much weaker in areas where the animal was moving smoothly. In data from 4 rats, the events were strong enough to be individually identified. They were characteri...