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J Neurophysiol. 2014 Sep 15;112(6):1409-20. doi: 10.1152/jn.00170.2014. Epub 2014 Jun 11.

Higher neuronal discharge rate in the motor area of the subthalamic nucleus of Parkinsonian patients.

Author information

  • 1Department of Medical Neurobiology, The Hebrew University-Hadassah Medical School, Jerusalem, Israel; The Edmond and Lily Safra Center for Brain Sciences, The Hebrew University, Jerusalem, Israel; marcd@ekmd.huji.ac.il.
  • 2Alpha Omega Engineering Ltd., Nazareth, Israel;
  • 3Department of Medical Neurobiology, The Hebrew University-Hadassah Medical School, Jerusalem, Israel; The Edmond and Lily Safra Center for Brain Sciences, The Hebrew University, Jerusalem, Israel; The Research Laboratory of Brain Imaging and Stimulation, The Jerusalem Mental Health Center, Kfar-Shaul Etanim, The Hebrew University-Hadassah Medical School, Jerusalem, Israel; and.
  • 4Center for Functional and Restorative Neurosurgery, Department of Neurosurgery, Hadassah University Hospital, Jerusalem, Israel.
  • 5Department of Medical Neurobiology, The Hebrew University-Hadassah Medical School, Jerusalem, Israel; The Edmond and Lily Safra Center for Brain Sciences, The Hebrew University, Jerusalem, Israel;

Abstract

In Parkinson's disease, pathological synchronous oscillations divide the subthalamic nucleus (STN) of patients into a dorsolateral oscillatory region and ventromedial nonoscillatory region. This bipartite division reflects the motor vs. the nonmotor (associative/limbic) subthalamic areas, respectively. However, significant topographic differences in the neuronal discharge rate between these two STN subregions in Parkinsonian patients is still controversial. In this study, 119 STN microelectrode trajectories (STN length > 2 mm, mean = 5.32 mm) with discernible oscillatory and nonoscillatory regions were carried on 60 patients undergoing deep brain stimulation surgery for Parkinson's disease. 2,137 and 2,152 multiunit stable signals were recorded (recording duration > 10 s, mean = 21.25 s) within the oscillatory and nonoscillatory STN regions, respectively. Spike detection and sorting were applied offline on every multiunit stable signal using an automatic method with systematic quantification of the isolation quality (range = 0-1) of the identified units. In all, 3,094 and 3,130 units were identified in the oscillatory and nonoscillatory regions, respectively. On average, the discharge rate of better-isolated neurons (isolation score > 0.70) was higher in the oscillatory region than the nonoscillatory region (44.55 ± 0.87 vs. 39.97 ± 0.77 spikes/s, N = 665 and 761, respectively). The discharge rate of the STN neurons was positively correlated to the strength of their own and their surrounding 13- to 30-Hz beta oscillatory activity. Therefore, in the Parkinsonian STN, beta oscillations and higher neuronal discharge rate are correlated and coexist in the motor area of the STN compared with its associative/limbic area.

Copyright © 2014 the American Physiological Society.

KEYWORDS:

Parkinson's disease; deep brain stimulation; microelectrode recording; neuronal discharge; subthalamic nucleus

PMID:
24920022
[PubMed - indexed for MEDLINE]
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