Involvement of the human pedunculopontine nucleus region in voluntary movements.

Abstract:

OBJECTIVE:The pedunculopontine nucleus region (PPNR) is being investigated as a target for deep brain stimulation (DBS) in Parkinson disease (PD), particularly for gait and postural impairment. A greater understanding of how PPNR activities and oscillations are modulated with voluntary movements is crucial to the development of neuromodulation strategies. METHODS:We studied 7 patients with PD who underwent DBS electrode implantations in the PPNR. PPNR local field potential and EEG were recorded while patients performed self-paced wrist and ankle movements. RESULTS:Back-averaging of the PPNR recording showed movement-related potentials before electromyography onset. Frequency analysis showed 2 discrete movement-related frequency bands in the theta (6- to 10-Hz) and beta (14- to 30-Hz) ranges. The PPNR theta band showed greater event-related desynchronization with movements in the ON than in the OFF medication state and was coupled with the sensorimotor cortices in the ON state only. Beta event-related desynchronization was observed in the PPNR during the premovement and movement execution phases in the OFF state. In contrast, premovement PPNR beta event-related synchronization occurred in the ON state. Moreover, beta band coherence between the PPNR and the midline prefrontal region was observed during movement preparation in the ON but not the OFF state. CONCLUSIONS:Activities of PPNR change during movement preparation and execution in patients with PD. Dopaminergic medications modulate PPNR activities and promote the interactions between the cortex and PPNR. Beta oscillations may have different functions in the basal ganglia and PPNR, and may be prokinetic rather than antikinetic in the PPNR.

journal_name

Neurology

journal_title

Neurology

authors

Tsang EW,Hamani C,Moro E,Mazzella F,Poon YY,Lozano AM,Chen R

doi

10.1212/WNL.0b013e3181f25b35

subject

Has Abstract

pub_date

2010-09-14 00:00:00

pages

950-9

issue

11

eissn

0028-3878

issn

1526-632X

pii

WNL.0b013e3181f25b35

journal_volume

75

pub_type

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