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Examples of voltage traces and power spectra of STN recordings from a single unit with theta and beta (A), a multiunit with low-beta (B), and a single unit with high-beta oscillatory frequencies (C; significance threshold is indicated by dashed line in each plot). D: distribution of significant frequency components in neuronal spike recordings in the STN. Unit oscillatory frequency did not appear to depend on the subject’s tremor dominant symptom category. PSD, power spectral density.
