title: The role of the sub-thalamic nucleus in the preparation of volitional movement termination in Parkinson's disease.
abstract: The sub-thalamic nucleus (STN) is relevant to the preparation of movement ignition but its role in movement termination is uncertain. Fourteen patients with Parkinson's disease (PD) received local field potentials (LFPs) recording at the left STN on the fourth day after deep brain stimulation surgery. They performed phasic and tonic movements of the right wrist extensor. Movement onset (Mon) and movement offset (Moff) of the electromyographic activities were used as triggers to determine an eight-second LFPs epoch for time-frequency analysis. Movement-related power changes were assessed by repeated measures analysis of variance with within-subject factors of Event (Mon and Moff), Period (ten time periods for phasic movement and six time periods for tonic movement), and Frequency (alpha, low-beta, and high-beta). There was significant triple interaction in both the phasic and tonic movements. By post-hoc analysis, high-beta event-related de-synchronization (ERD) appeared earlier (3s prior to Mon) than those of low-beta and alpha for the Mon phasic movement. There was no alpha ERD for the Mon tonic movement. Alpha, low-beta, and high-beta ERD all appeared about 1s prior to the Moff tonic movement. The current findings suggest that STN participates in the preparation of volitional movement termination but via a different mechanism from that in movement initiation. Unlike asynchronous ERD frequency bands present in movement initiation, a simultaneous ERD across wide frequency bands in STN may play a pivotal role in terminating volitional movement.
authors: Neuroscience Laboratory, Department of Neurology, China Medical University Hospital, Taichung, Taiwan.
authors: Yi-Ting
authors: YT
authors: Hsu
authors: Hsin-Yi
authors: HY
authors: Lai
authors: Yao-Chuan
authors: YC
authors: Chang
authors: Shang-Ming
authors: SM
authors: Chiou
authors: Ming-Kuei
authors: MK
authors: Lu
authors: Yu-Chin
authors: YC
authors: Lin
authors: Yen-Liang
authors: YL
authors: Liu
authors: Chiung-Chu
authors: CC
authors: Chen
authors: Hui-Chun
authors: HC
authors: Huang
authors: Ting-Fang
authors: TF
authors: Chien
authors: Shinn-Zong
authors: SZ
authors: Lin
authors: You-Yin
authors: YY
authors: Chen
authors: Chon-Haw
authors: CH
authors: Tsai
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D058256:Brain Waves / Q000502:physiology*; D046690:Deep Brain Stimulation / Q000379:methods*; D004569:Electroencephalography; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D010300:Parkinson Disease / Q000503:physiopathology* / Q000628:therapy*; D013057:Spectrum Analysis; D020531:Subthalamic Nucleus / Q000502:physiology*