Excessive synchronization of basal ganglia neurons at 20 Hz slows movement in Parkinson's disease.

Abstract:

:Excessive synchronization of neuronal activity at around 20 Hz is a common finding in the basal ganglia of patients with untreated Parkinson's disease (PD). Correlative evidence suggests, but does not prove, that this spontaneous activity may contribute to slowness of movement in this condition. Here we investigate whether externally imposed synchronization through direct stimulation of the region of the subthalamic nucleus at 20 Hz can slow motor performance in a simple unimanual tapping task and whether this effect is frequency selective. Tapping rates were recorded on 42 sides in 22 patients with PD after overnight withdrawal of medication. Tapping was performed without stimulation and during bilateral stimulation at 20 Hz, 50 Hz and 130 Hz. We found that tapping rates were slowed by 8.2+/-3.2% (p=0.014) during 20-Hz stimulation in subjects with relatively preserved baseline function in the task. This effect was frequency selective. The current data provide proof of the principle that excessive beta synchrony within the basal ganglia-cortical loop may contribute to the slowing of movements in Parkinson's disease.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Chen CC,Litvak V,Gilbertson T,Kühn A,Lu CS,Lee ST,Tsai CH,Tisch S,Limousin P,Hariz M,Brown P

doi

10.1016/j.expneurol.2007.01.027

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

214-21

issue

1

eissn

0014-4886

issn

1090-2430

pii

S0014-4886(07)00058-1

journal_volume

205

pub_type

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