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Neuroimage Clin. 2017 Jul 24;16:175-183. doi: 10.1016/j.nicl.2017.07.018. eCollection 2017.

Localization of beta and high-frequency oscillations within the subthalamic nucleus region.

Author information

1
Department of Neurology, Charité - University Medicine Berlin, Berlin, Germany.
2
Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, London, United Kingdom.
3
Nuffield Department of Clinical Neuroscience, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom.
4
Unit of Functional Neurosurgery, Sobell Department of Motor Neuroscience and Movement Disorders, UCL Institute of Neurology, London, United Kingdom.
5
Department of Clinical Neuroscience, Umeå University, Umeå, Sweden.
6
Victor Horsley Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom.
7
Berenson-Allen Center for Non-Invasive Brain Stimulation and Division of Cognitive Neurology, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
8
Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
9
Medical Research Council Brain Network Dynamics Unit at the University of Oxford, Oxford, United Kingdom.

Abstract

Parkinsonian bradykinesia and rigidity are typically associated with excessive beta band oscillations in the subthalamic nucleus. Recently another spectral peak has been identified that might be implicated in the pathophysiology of the disease: high-frequency oscillations (HFO) within the 150-400 Hz range. Beta-HFO phase-amplitude coupling (PAC) has been found to correlate with severity of motor impairment. However, the neuronal origin of HFO and its usefulness as a potential target for deep brain stimulation remain to be established. For example, it is unclear whether HFO arise from the same neural populations as beta oscillations. We intraoperatively recorded local field potentials from the subthalamic nucleus while advancing DBS electrodes in 2 mm steps from 4 mm above the surgical target point until 2 mm below, resulting in 4 recording sites. Data from 26 nuclei from 14 patients were analysed. For each trajectory, we identified the recording site with the largest spectral peak in the beta range (13-30 Hz), and the largest peak in the HFO range separately. In addition, we identified the recording site with the largest beta-HFO PAC. Recording sites with largest beta power and largest HFO power coincided in 50% of cases. In the other 50%, HFO was more likely to be detected at a more superior recording site in the target area. PAC followed more closely the site with largest HFO (45%) than beta power (27%). HFO are likely to arise from spatially close, but slightly more superior neural populations than beta oscillations. Further work is necessary to determine whether the different activities can help fine-tune deep brain stimulation targeting.

KEYWORDS:

Basal ganglia; Cross-frequency coupling; Electrophysiology; Motor system; Oscillations; Parkinson's disease

PMID:
28794978
PMCID:
PMC5540829
DOI:
10.1016/j.nicl.2017.07.018
[Indexed for MEDLINE]
Free PMC Article

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