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Pallidal recordings of local field potentials (LFPs) in patients with dystonia have demonstrated semi-oscillatory activity over 3-12 Hz. Although this activity has been hypothesized to contribute to dystonia, it is unclear to what extent these LFP oscillations arise in the globus pallidus interna (GPi) and are synchronous with local neuronal discharge. We therefore recorded LFPs and neuronal activity from microelectrodes inserted into the pallidum on nine sides in six awake patients with primary dystonia during functional neurosurgery. Mean normalized LFP power over 3-12 Hz was higher in GPi than globus pallidus externa. Spike triggered averages were computed, and 11 exhibited significant features in the 3-12 Hz band, indicating that the discharges of local neurons were locked to 3-12 Hz oscillations in the LFP. All but two of these STAs were in GPi. We conclude that pallidal oscillations at 3-12 Hz are maximal in GPi, the surgical target, in patients with dystonia and that they can be synchronized to activity in local neurons. This lends support to a pathophysiological relationship between LFP activity at 3-12 Hz and dystonia.

Original publication

DOI

10.1016/j.expneurol.2006.07.011

Type

Journal article

Journal

Exp Neurol

Publication Date

12/2006

Volume

202

Pages

480 - 486

Keywords

Adult, Confidence Intervals, Cortical Synchronization, Deep Brain Stimulation, Dystonia, Evoked Potentials, Female, Globus Pallidus, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Neurons, Spectrum Analysis