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The Journal of Neuroscience, October 15, 2000, 20(20):7766-7775
High-frequency Synchronization of Neuronal Activity in the
Subthalamic Nucleus of Parkinsonian Patients with Limb Tremor
Ron
Levy1,
William D.
Hutchison1, 2, 3,
Andres M.
Lozano2, 3, and
Jonathan O.
Dostrovsky1, 3
1 Department of Physiology, Faculty of Medicine,
University of Toronto, Toronto, Ontario, Canada M5S 1A8,
2 Department of Surgery, University of Toronto, Division of
Neurosurgery, The Toronto Western Hospital, Ontario, Canada M5T 2S8,
and 3 The Toronto Western Research Institute, Toronto,
Ontario, Canada M5T 2S8
It has been hypothesized that in Parkinson's disease (PD) there is
increased synchronization of neuronal firing in the basal ganglia. This
study examines the discharge activity of 121 pairs of subthalamic
nucleus (STN) neurons in nine PD patients undergoing functional
stereotactic mapping. Four patients had a previous pallidotomy. A
double microelectrode setup was used to simultaneously record from two
neurons separated by distances as small as 250 µm. In the six
patients who had limb tremor during the recording session
(n = 76 pairs), the discharge pattern of 12 pairs
of tremor cells (TCs) was found to be coherent at the frequency of the
limb tremor. Both in-phase and out-of-phase relationships were observed between TCs. Interestingly, in these six patients, 63/129 single neurons displayed 15-30 Hz oscillations, whereas 36/76 pairs were coherent in this frequency range. Although the oscillatory frequencies were variable between patients, they were highly clustered within a
patient. The phase difference between these pairs was found to be close
to 0. High-frequency synchronization was observed during periods of
limb tremor as well as during intermittent periods with no apparent
limb tremor. In contrast, in the three patients without limb tremor
during the recording session, only 1/84 neurons had high-frequency
oscillatory activity, and no TCs or synchronous high-frequency
oscillatory activity was observed (n = 45 pairs). These findings demonstrate that in PD patients with limb tremor, many
STN neurons display high-frequency oscillations with a high degree of
in-phase synchrony. The results suggest that high-frequency synchronized oscillatory activity may be associated with the pathology that gives rise to tremor in PD patients.
Key words:
Parkinson's disease; limb tremor; synchronization; tremor cells; subthalamic nucleus; basal ganglia
Copyright © 2000 Society for Neuroscience 0270-6474/00/20207766-10$05.00/0
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