High-frequency microstimulation in human globus pallidus and substantia nigra.

Experimental Brain Research
Myriam Lafreniere-RoulaJonathan O Dostrovsky

Abstract

Deep brain stimulation of the basal ganglia and other brain regions has been used successfully to treat a variety of neurological disorders. However, the mechanisms by which it works, remain unclear. In a previous study, we showed that locally delivered single current pulses delivered from a nearby microelectrode are sufficient to inhibit firing in the internal globus pallidus for tens of milliseconds. The GPi and the substantia nigra pars reticulata are the output nuclei of the basal ganglia and share many anatomical and physiological features. The goal of the current study was to examine the after-effects of trains of high-frequency microstimulation on neuronal firing in the GPi of Parkinson's disease and dystonia patients as well as in the SNr of PD patients. Microelectrode recordings and microstimulation were performed in a total of 57 patients during stereotactic surgery. We found that firing in the GPi and SNr is inhibited for several hundreds of milliseconds following the end of a short, 200 Hz high-frequency train delivered through the recording electrode (e.g., on average 618 ms when stimulating in the SNr with a 0.5 s train of 4 microA pulses at 200 Hz). Inhibition duration usually increased with increasing current in...Continue Reading

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