Altered Pallidocortical Low-Beta Oscillations During Self-Initiated Movements in Parkinson Disease.
Parkinson disease
basal ganglia thalamocortical network
beta oscillations
local field potential
self-initiated movements
Journal
Frontiers in systems neuroscience
ISSN: 1662-5137
Titre abrégé: Front Syst Neurosci
Pays: Switzerland
ID NLM: 101477946
Informations de publication
Date de publication:
2020
2020
Historique:
received:
24
04
2020
accepted:
06
07
2020
entrez:
15
8
2020
pubmed:
15
8
2020
medline:
15
8
2020
Statut:
epublish
Résumé
Parkinson disease (PD) patients have difficulty with self-initiated (SI) movements, presumably related to basal ganglia thalamocortical (BGTC) circuit dysfunction, while showing less impairment with externally cued (EC) movements. We investigate the role of BGTC in movement initiation and the neural underpinning of impaired SI compared to EC movements in PD using multifocal intracranial recordings and correlating signals with symptom severity. We compared time-resolved neural activities within and between globus pallidus internus (GPi) and motor cortex during between SI and EC movements recorded invasively in 13 PD patients undergoing deep brain stimulation implantation. We compared cortical (but not subcortical) dynamics with those recorded in 10 essential tremor (ET) patients, who do not have impairments in movement initiation. SI movements in PD are associated with greater low-beta (13-20 Hz) power suppression during pre-movement period in GPi and motor cortex compared to EC movements in PD and compared to SI movements in ET (motor cortex only). SI movements in PD are uniquely associated with significant low-beta pallidocortical coherence suppression during movement execution that correlates with bradykinesia severity. In ET, motor cortex neural dynamics during EC movements do not significantly differ from that observed in PD and do not significantly differ between SI and EC movements. These findings implicate low beta BGTC oscillations in impaired SI movements in PD. These results provide a physiological basis for the strategy of using EC movements in PD, circumventing diseased neural circuits associated with SI movements and instead engaging circuits that function similarly to those without PD.
Sections du résumé
BACKGROUND
BACKGROUND
Parkinson disease (PD) patients have difficulty with self-initiated (SI) movements, presumably related to basal ganglia thalamocortical (BGTC) circuit dysfunction, while showing less impairment with externally cued (EC) movements.
OBJECTIVES
OBJECTIVE
We investigate the role of BGTC in movement initiation and the neural underpinning of impaired SI compared to EC movements in PD using multifocal intracranial recordings and correlating signals with symptom severity.
METHODS
METHODS
We compared time-resolved neural activities within and between globus pallidus internus (GPi) and motor cortex during between SI and EC movements recorded invasively in 13 PD patients undergoing deep brain stimulation implantation. We compared cortical (but not subcortical) dynamics with those recorded in 10 essential tremor (ET) patients, who do not have impairments in movement initiation.
RESULTS
RESULTS
SI movements in PD are associated with greater low-beta (13-20 Hz) power suppression during pre-movement period in GPi and motor cortex compared to EC movements in PD and compared to SI movements in ET (motor cortex only). SI movements in PD are uniquely associated with significant low-beta pallidocortical coherence suppression during movement execution that correlates with bradykinesia severity. In ET, motor cortex neural dynamics during EC movements do not significantly differ from that observed in PD and do not significantly differ between SI and EC movements.
CONCLUSION
CONCLUSIONS
These findings implicate low beta BGTC oscillations in impaired SI movements in PD. These results provide a physiological basis for the strategy of using EC movements in PD, circumventing diseased neural circuits associated with SI movements and instead engaging circuits that function similarly to those without PD.
Identifiants
pubmed: 32792918
doi: 10.3389/fnsys.2020.00054
pmc: PMC7390921
doi:
Types de publication
Journal Article
Langues
eng
Pagination
54Informations de copyright
Copyright © 2020 Choi, Malekmohammadi, Sparks, Kashanian, Cross, Bordelon and Pouratian.
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